International Journal of Horticulture, Agriculture and Food Science (IJHAF)
ISSN: 2456-8635
[Vol-9, Issue-2, Apr-Jun, 2025]
Issue DOI: https://dx.doi.org/10.22161/ijhaf.9.2
Peer-Reviewed Journal
Article DOI: https://dx.doi.org/10.22161/ijhaf.9.2.3 (Int. j. hortic. agric. food sci.)
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Effect of Storage Conditions and Plastic Packaging on
Postharvest Quality of Mandarin (Citrus reticulata Blanco.)
in Dhankuta, Nepal
Sagar Bhusal1,*
, Bibek Acharya2,
, Susmita Adhikari1
, Hom Nath Giri3
, Umesh Kumar
Acharya5
, Arjun Kumar Shrestha4
, Dipti Adhikari6
and Shruti Shrestha1
1
Department of Horticulture, Agriculture and Forestry University (AFU), Rampur, Chitwan, Nepal
2
Department of Biological Sciences, Simon Fraser University, Burnaby, BC, Canada
3
Chairman, Department of Horticulture, AFU, Rampur, Chitwan, Nepal
4
Dean, Faculty of Agriculture, AFU, Rampur, Chitwan, Nepal
5
Senior Research Scientist, Nepal Agricultural Research Council (NARC)
6
Technical Officer (T6), Nepal Agricultural Research Council (NARC)
*Corresponding author
Received: 27 May 2025; Received in revised form: 20 May 2025; Accepted: 25 May 2025; Available online: 02 Jun 2025
©2025 The Author(s). Published by AI Publications. This is an open-access article under the CC BY license
(https://creativecommons.org/licenses/by/4.0/)
Abstract— Postharvest deterioration significantly affects the shelf life and marketability of mandarin fruit in
Nepal. The primary causes are inadequate storage and packaging practices. This study aimed to evaluate the
effects of storage conditions and plastic packaging with varying ventilation levels on the postharvest quality of
mandarin fruit during storage. A laboratory experiment was conducted during January to March of 2021 to study
the effect of storage conditions- room storage (15.98± 0.89 °C, 71.15± 5.80% RH), cellar storage (14.72 ± 1.20
°C, 94.28 ± 5.71% RH) and cool chamber with CoolBot (8.12 ± 0.44 °C, 79.43 ± 4.54% RH) and different plastic
packaging of 25 micron: two, four, six and eight holes plastic and control (open tray). The experiment was laid
out in factorial randomized complete block design with three replications. Result revealed that the lowest
physiological loss in weight (9%) was recorded under CoolBot with 8 holes packaging, while the highest
(23.66%) was in control under room storage. The highest total soluble solids (14.19 °brix) and the lowest
titratable acid (0.88%) were observed in the control. Greater vitamin-C content was observed in CoolBot storage
and 8 holes plastic packaging (27.29 mg/100g and 29.11 mg/100g respectively). The longest shelf life (91 days)
was found under CoolBot storage with 8 holes plastic packaging as compared to control in room storage (32
days). Further validation across multiple seasons and commercial production settings is recommended.
Keywords— Mandarin, CoolBot, polyethene packaging, shelf life, postharvest quality, storage conditions,
preliminary study.
I. INTRODUCTION
Citrus fruits (genus Citrus; family Rutaceae) are
specialized form of berry, named hesperidium, characterized
by a juicy pulp made of vesicles within segments (Strano et
al., 2017). Citrus, particularly the mandarin orange is the most
important and highly commercialized fruit crop in the hills of
Nepal. Mandarin is a group name for a class of citrus fruit with
thin and loose peel. Mandarin (Citrus reticulata Blanco) is a
most potent fruit crop that stands in first position of the total
fruit industry in Nepal. The mid-hill region (1000 to 1500 m
altitude) has a comparative advantage in the cultivation of
Bhusal et al. International Journal of Horticulture, Agriculture and Food Science (IJHAF)
9(2)-2025
Article DOI: https://dx.doi.org/10.22161/ijhaf.9.2.3 (Int. j. hortic. agric. food sci.)
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citrus fruits, especially mandarin and sweet orange (Bhattarai
et al., 2013). It shares 0.97 % in AGDP and 0.33 % in GDP
(PMD, 2002). The country exports mandarin to India, China,
Bangladesh, Bhutan, Pakistan and other countries, is about
600 mt annually (TEPC, 2013).
The postharvest losses of citrus in South Asian
region are estimated as 20% (Ladaniya, 2015). Diseases and
pests, delay harvest, poor roads, cold storage conditions and
glut cause these losses. But the attack of the blue mould
(Penicillium italicum) and green mould (P. digitatum) causes
postharvest decays of citrus fruits in cold storage as well as in
open citrus fruits and pollutes the environment as well.
Different packaging practices and storage helps to reduce
post-harvest diseases and prolongs the shelf life of mandarin.
Storage of citrus is essential in order to prolong their
usability which aims to slow down the respiration,
transpiration, and development of pathological or
physiological disorders so that the commodity could be
preserved for longer in the most usable form. By proper
storage, undesirable processes like rotting, sprouting,
toughening, ripening and greening process are minimized.
According to Shrestha et al. (1993) most important factors for
storage are the commodity itself, the physiochemical
environment, and the microbial environment. The commodity
should be properly matured, healthy, and should be able to
tolerate adverse environmental conditions.
Despite the importance of citrus to Nepalese
horticulture, high postharvest losses remain a critical barrier
to profitability for smallholder growers. Improving shelf life
through better storage and packaging can reduce waste and
increase value, but research in this area remains limited.
Given the lack of low-cost storage trials for mandarin in
Nepal, this study aims to provide insights into how packaging
ventilation and storage conditions affect postharvest quality,
with the goal of identifying promising solutions for reducing
losses.
II. MATERIALS AND METHODS
2.1. Research Location
This study was conducted at the laboratory of the
National Citrus Research Program (NCRP), located in
Paripatle, Dhankuta, Nepal. The fruits used in the experiment
were harvested from the orchard of NCRP. Dhankuta is a mid-
hill district situated in Koshi province of Nepal, situated
between 26°53' to 27°19' N latitude and 87°08' to 88°33' E
longitude. The experimental site lies at an elevation ranging
from 1100 to 1400 meters above sea level.
2.2 Experimental design and treatments
The research was laid out in Factorial Randomized
Complete Block Design (RCBD) with 15 treatments
combination and replicated three times. The mandarins were
kept in five different types of packaging materials (P1- Tray
(control), P2- Plastic bag with 2 holes, P3- Plastic bag with 4
holes, P4- Plastic bag with 6 holes and P5- Plastic bag with 8
holes) and kept in three different storage conditions (S1-
Room storage, S2- Cellar storage and S3- CoolBot storage).
The detailed treatment combinations are given in Table 1.
Table 1. Treatment combinations of storage condition and plastic packaging of mandarin
S.N. Treatment Symbol Treatment combination
1 T1 S1P1 Room storage + Control
2 T2 S1P2 Room storage + 2 holes plastic packaging
3 T3 S1P3 Room storage + 4 holes plastic packaging
4 T4 S1P4 Room storage + 6 holes plastic packaging
5 T5 S1P5 Room storage + 8 holes plastic packaging
6 T6 S2P1 Cellar storage + Control
7 T7 S2P2 Cellar storage + 2 holes plastic packaging
8 T8 S2P3 Cellar storage + 4 holes plastic packaging
9 T9 S2P4 Cellar storage + 6 holes plastic packaging
10 T10 S2P5 Cellar storage + 8 holes plastic packaging
11 T11 S3P1 CoolBot storage + Control
12 T12 S3P2 CoolBot storage + 2 holes plastic packaging
Bhusal et al. International Journal of Horticulture, Agriculture and Food Science (IJHAF)
9(2)-2025
Article DOI: https://dx.doi.org/10.22161/ijhaf.9.2.3 (Int. j. hortic. agric. food sci.)
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13 T13 S3P3 CoolBot storage + 4 holes plastic packaging
14 T14 S3P4 CoolBot storage + 6 holes plastic packaging
15 T15 S3P5 CoolBot storage + 8 holes plastic packaging
Each treatment comprised 4 polyethylene bags (25 microns)
containing 10 fruits per bag. One bag per treatment was
designated for non-destructive observations, while the
remaining bags were used for destructive sampling at
scheduled intervals.
2.3 Pre-storage fruit handling
Mature, yellowish mandarin fruits- cultivar Khoku
Local were carefully harvested from the orchard of the
National Citrus Research Program (NCRP) using secateurs to
minimize mechanical damage. The fruits were then brought to
the laboratory, where they were sorted and graded based on
size, uniformity, and absence of visible defects. Following
sorting, the fruits were washed in tap water for two minutes to
remove any adhering dirt or debris and subsequently air-dried
in the shade for 2–3 hours. To strengthen the peel and reduce
postharvest decay, the fruits were dipped in a 4 g/L solution
of Chlorocal (calcium chloride) for four minutes and then
allowed to dry again under shade conditions. A thin, uniform
layer of wax was gently applied to the peel surface by hand to
reduce moisture loss and improve external appearance.
Finally, the waxed fruits were left to dry for an additional two
hours before packaging and storage.
2.4. Packaging and Storage
Plastic bags (25 microns) were punched with holes
(2, 4, 6, and 8) of 5 mm diameter using a punching machine.
Ten fruits were packed per bag, and the bag openings were
sealed using rubber bands. Bags were then placed in their
designated storage structures (Room, Cellar, or CoolBot).
2.5. Data Collection
Both non-destructive and destructive observations
were made throughout the storage period. Non-destructive
data included Physiological loss in weight (PLW) and Decay
loss whereas, destructive data included Total Soluble Solids
(TSS), Titratable Acidity (TA) and Vitamin C content.
2.5.1 Physiological loss in weight (PLW)
Weight loss was recorded at weekly interval over the
storage period. A digital sensitive balance was used to record
the fruit weight. Weight loss was calculated according the
methods described by Joshi et al. (2020).
𝑃𝐿𝑊 (%) = {(W0 – Wt. ) ÷ W0} ∗ 100
Where, PLW is the physiological loss in weight, W0 is the
initial fruit weight and Wt. is the weight of fruits at the
designated time.
2.5.2 Decay loss
The fruits of mandarin were visually evaluated for the
symptoms of decay. Decay loss was recorded at weekly
interval basis.
𝐷𝑒𝑐𝑎𝑦 𝑙𝑜𝑠𝑠 (%) = (𝑀𝑎𝑠𝑠 𝑜𝑓 𝑑𝑒𝑐𝑎𝑦𝑒𝑑 𝑓𝑟𝑢𝑖𝑡
÷ 𝑇𝑜𝑡𝑎𝑙 𝑚𝑎𝑠𝑠 𝑜𝑓 𝑓𝑟𝑢𝑖𝑡) ∗ 100
2.5.3 Juice percentage
The juice content was taken from three destructive sample
by squeezing through manual methods at every 15 days
interval. Juice percentage per fruit was obtained from the
following formula adopted by Joshi et al. (2020).
𝐽𝑢𝑖𝑐𝑒 𝑐𝑜𝑛𝑡𝑒𝑛𝑡 (%)
= (𝐽𝑢𝑖𝑐𝑒 𝑤𝑒𝑖𝑔ℎ𝑡 𝑝𝑒𝑟 𝑓𝑟𝑢𝑖𝑡
÷ 𝐼𝑛𝑑𝑖𝑣𝑖𝑑𝑢𝑎𝑙 𝑓𝑟𝑢𝑖𝑡 𝑤𝑒𝑖𝑔ℎ𝑡) ∗ 100
2.5.4 Total soluble solids (TSS)
TSS was determined by using Pal Brix-Acidity
meter. Two to three drops of clear fruit juice were placed on
the prism of the instrument for TSS determination. It was
measured in ºBrix.
2.5.5 Titratable acidity (TA)
The extracted fruit juice was diluted to the ratio of
1:50 and TA was recorded using Pal Brix-Acidity meter by
placing 1-2 drops of diluted juice on the prism surface. TAwas
measured in terms of percentage.
2.5.6 TSS/TA ratio
𝑇𝑆𝑆
𝑇𝐴
= 𝑇𝑜𝑡𝑎𝑙 𝑠𝑜𝑙𝑢𝑏𝑙𝑒 ÷ 𝑇𝑖𝑡𝑟𝑎𝑡𝑎𝑏𝑙𝑒 𝑎𝑐𝑖𝑑𝑖𝑡𝑦
2.5.7 pH of fruit juice
pH of the sample fruit was measured with the help of digital
pH meter.
2.5.8 Vitamin C (Ascorbic acid)
The ascorbic acid of the fruit was measured by volumetric
method as per the reference from Sadasivsm and Manickam
(1991). Following formula was used to calculate the ascorbic
acid content.
Bhusal et al. International Journal of Horticulture, Agriculture and Food Science (IJHAF)
9(2)-2025
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𝐴𝑚𝑜𝑢𝑛𝑡 𝑜𝑓 𝑎𝑠𝑐𝑜𝑟𝑏𝑖𝑐 𝑎𝑐𝑖𝑑 (
𝑚𝑔
100𝑔
)
=
(0.5 𝑚𝑔 ∗ 𝑉2 ∗ 100 ∗ 100)
(𝑉1 ∗ 5 𝑚𝑙 ∗ 𝑤𝑒𝑖𝑔ℎ𝑡 𝑜𝑓 𝑗𝑢𝑖𝑐𝑒)
Where, V1 = amount of dye consumed during titration, V2 =
Amount of dye consumed when supernatant was titrated with
4% oxalic acid It was determined at the fortnightly interval.
The titration was done using the 2,6-
dichlorophenolindophenol method (Antoniali et al., 2007)
2.5.9 Index of absorbance difference (IAD)
Index of absorbance difference (IAD) was measured
using Delta absorbance (DA) meter. The DAmeter emits LED
light to fruit skin and measures the amount of light reflected
back (Cai & Farcuh, 2021).
2.5.10 Citrus color index (CCI)
Color index of the fruit skin was determined by using
Chroma meter (CR-400). Three values i.e. L, a, and b were
recorded. The value “L” represents lightness, its value ranges
from 0 to 100, more black colors close to zero and more white
colors close to 100. The value “a” represents the redness, and
the value “b” represents the yellowness. On the basis of the
values L, a, and b, citrus color index (CCI) was calculated
according to the formula given by Pandey et al. (2021).
𝐶𝐶𝐼 = {
(1000 ∗ 𝑎)
𝐿 ∗ 𝑏
}
2.5.11 Shelf life
Shelf life was determined by visual observation of non-
destructive sample. The fruit lots will be considered to have
reached the end of shelf life when 50% of fruits showed visual
observation of shrinkage or spoilage due to pathogens.
2.6 Statistical Analysis
The collected data was compiled in MS–excel program and
analysis of variance for all parameters was done by using
Genstat 15 Edition statistical computer package for Factorial
Randomized Complete Block Design. Duncan`s Multiple
Range Test (DMRT) for the mean separations was done from
the reference of Gomez and Gomez (1984). Table and Graph
was constructed by using the MS- word and excel computer
software program.
III. RESULTS AND DISCUSSION
The following results present the combined effects of storage
conditions and plastic packaging with varying ventilation
level on key quality parameters including physiological
weight loss, vitamin C content, total soluble solids, titratable
acidity, and visual deterioration over time.
3.1 Physiological loss in weight
Physiological loss in weight (PLW) differed significantly (p
< 0.05) among the different storage conditions at 7 days of
storage (DOS), 28 DOS, 35 DOS, 42 DOS, and 49 DOS but it
did not differ significantly at 14 DOS and 21 DOS (Table 2).
Physiological loss in weight (PLW) differed significantly (p <
0.05) among the different plastic packaging in all days interval
(Table 2).
Higher PLW was observed in case of room storage,
intermediate was observed in case of cellar storage and lower
percentage of PLW was observed in case of cool chamber with
CoolBot, which might be due to the reason that the higher
temperature in the room storage leads to greater transpiration
resulting in higher physiological loss in weight.
In Mandarin, it was observed that lower temperatures were
found to reduce weight loss in all treatments (Lambrinou &
Papadopoulou, 1995). Significantly the lower physiological
loss in weight was observed in case of perforated polyethene
(2.38%) compared to control (19.08%) at 24 days of storage
(Paudel et al., 2020; Acharya et al., 2020). The highest PLW
at 45 days of storage of Kagzi Lime was observed in case of
control (33.46%) while fruits stored in MAP showed a
minimum PLW (1.04%) (Hayat et al., 2017).
Table 2. Effect of storage conditions and plastic packaging on physiological loss in weight of mandarin during storage.
Treatments
Physiological loss in weight (%)
7
DOS
14
DOS
21
DOS
28
DOS
35
DOS
42
DOS
49
DOS
Storage conditions (Factor A)
Room storage 2.59a
4.66 7.09 8.60a
10.72a
12.53a
16.93a
Cellar storage 2.41a
4.99 7.10 8.81a
10.27a
10.99b
15.27b
Cool chamber with CoolBot 0.92b
4.14 6.86 7.48b
8.38b
10.13b
12.87c
Bhusal et al. International Journal of Horticulture, Agriculture and Food Science (IJHAF)
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SEm (±) 0.15 0.26 0.48 0.33 0.46 0.49 0.25
F-value *** Ns Ns * ** *** ***
LSD0.05 0.44 - - 0.94 1.33 1.09 0.72
Plastic packaging (Factor B)
Control 2.64a
5.75a
8.97a
12.26a
14.18a
16.54a
21.89a
LDPE plastic with two holes 2.19ab
4.54bc
6.99b
8.08b
11.10b
12.44b
15.67b
LDPE plastic with four holes 1.79bc
4.15bc
6.87b
7.02b
7.80c
9.90c
14.00c
LDPE plastic with six holes 1.84bc
4.86ab
6.74b
7.07b
8.12c
9.00cd
12.67d
LDPE plastic with eight holes 1.41c
3.68c
5.49b
7.07b
7.33c
8.21d
10.89e
SEm (±) 0.20 0.34 0.63 0.42 0.59 0.49 0.32
F-value ** ** * *** *** *** ***
LSD0.05 0.57 0.98 1.8 1.22 1.72 1.41 0.93
CV, % 12.7 19.3 13.5 15.3 14.7 13.1 8.4
Grand mean 1.97 4.60 7.01 8.30 9.79 11.22 15.02
Means with same letter in column are not significantly different at p = 0.05 by DMRT. Ns = Not Significant, ** significant at p <
0.01, ***significant at p < 0.001 and ns: not significantly different at p > 0.05. SEm± = Standard error of mean, LSD = Least
significant difference, CV = Coefficient of variation and DOS = Days of storage
3.2 Decay loss
Decay loss differed significantly (p < 0.05) among
the different storage conditions at 7 days of storage (DOS), 28
DOS, 35 DOS, and 42 DOS but it did not differ significantly
at 14 DOS, 21 DOS, and 49 DOS (Table 3). At 7 DOS,
significantly the highest decay loss of 2.12% was observed in
room condition while no decay loss was observed at all in the
cool chamber with CoolBot. At 49 DOS, the highest decay
loss of 12.51% was observed in the room condition while the
lowest decay loss of 9.22% was observed in the cool chamber
with CoolBot. At 7 DOS, the highest decay loss of 1.55% was
observed in the LDPE plastic packaging with two holes while
the lowest decay loss of 0.69% was found in the LDPE plastic
packaging with eight holes. At 49 DOS, the highest decay loss
of 12.00% was found in the control condition while the lowest
decay loss of 9.02% was found in the LDPE plastic packaging
with eight holes.
Higher decay loss in room storage compared to cellar
and cool chamber with CoolBot might be due to higher
temperature in room storage, as higher temperature accounted
for invasive disease development. The result is in line with
Talukder et al. (2015) who reported the highest fruit decay in
mandarin without polybag and the lowest observed in 0.5%
perforated polybag and kept at 5°C during 90 days of storage
period, which indicates that temperature has greater role in
decay.
Table 3. Effect of storage conditions and plastic packaging on decay loss of mandarin in storage.
Treatments
Decay loss (%)
7 DOS 14 DOS 21 DOS 28 DOS 35 DOS 42 DOS 49 DOS
Storage conditions (Factor A)
Room storage 2.12a
2.53 4.49 5.46a
8.33a
9.51a
12.51
Cellar storage 1.27b
2.4 4.27 5.41a
7.01ab
7.82b
10.68
Cool chamber with CoolBot 0.00c
1.8 3.47 3.87b
5.02b
6.23b
9.22
SEm (±) 0.24 0.31 0.38 0.39 0.89 0.55 0.96
F-value *** Ns Ns * * ** Ns
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LSD0.05 0.71 - - 1.13 2.56 1.58 -
Plastic packaging (Factor B)
Control 1.22 3.00 4.71 5.62 8.56 9.56 12.00
LDPE plastic with two holes 1.55 2.44 4.44 5.24 7.88 9.10 11.30
LDPE plastic with four holes 1.29 2.11 4.44 5.34 6.40 8.03 10.36
LDPE plastic with six holes 0.88 2.00 4.026 4.69 5.61 7.76 10.15
LDPE plastic with eight holes 0.69 1.67 3.82 4.17 5.49 7.52 9.02
SEm (±) 0.31 0.40 0.50 0.50 1.14 0.71 1.24
F-value Ns Ns Ns Ns Ns Ns Ns
LSD0.05 - - - - - - -
CV, % 18.2 15.4 14.3 19.6 25 17.8 21.4
Grand mean 1.13 2.24 4.21 5.02 6.79 8.56 11.13
Means with same letter in column are not significantly different at p = 0.05 by DMRT. Ns = Not Significant, ** significant at p <
0.01, ***significant at p < 0.001 and ns: not significantly different at p > 0.05. SEm± = Standard error of mean, LSD = Least
significant difference, CV = Coefficient of variation and DOS = Days of storage
3.3 Juice percentage
Juice percentage did not differed significantly (p < 0.05)
among the different storage conditions at all days of data
recording (Table 4). Juice percentage was found to decrease
with the increase in storage duration in all storage conditions.
At 60 DOS, the juice percentage of 31.68% was found to be
the highest in cool chamber with CoolBot. Juice percentage
differed significantly (p < 0.05) among the different plastic
packaging at all days of storage (Table 4). At 45 DOS, the
highest juice percentage of 36.23% was found in LDPE plastic
packaging with eight holes.
The perforated plastic created the modified atmospheric
environment acting as a barrier which reduced the moisture
loss from the fruit attributed by low respiration and
transpiration rate resulting in the higher juice percentage
(Bhattarai & Shah, 2017). Ahamad and Siddiqui (2013)
reported higher juice percentage in case of PE-packed fruits
followed by the fruits with 100% Sta-Fresh 960 which might
be due to less water loss in PE-packaging and waxing
treatments as the combination acts as a barrier to moisture
loss. Maximum juice percentage was observed in case of
GA3+ perforated polyethene (40.30%) compared to control
(32.63%) during 24 DOS of mandarin (Paudel et al., 2020).
Table 4. Effect of storage conditions and plastic packaging on juice percentage of mandarin in storage.
Treatments
Juice Percentage
15 DOS 30 DOS 45 DOS 60 DOS
Storage conditions (Factor A)
Room storage 39.47 35.81 33.52 31.17
Cellar storage 40.00 35.96 33.73 31.52
Cool chamber with CoolBot 41.08 36.62 34.20 31.68
SEm (±) 0.51 0.52 0.51 0.49
F-value Ns Ns Ns Ns
LSD0.05 - - - -
Plastic packaging (Factor B)
Control 36.46c
32.79c
30.72d
28.40c
Bhusal et al. International Journal of Horticulture, Agriculture and Food Science (IJHAF)
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LDPE plastic with two holes 39.67b
35.49b
32.72c
29.95bc
LDPE plastic with four holes 39.88b
36.33b
33.88bc
31.17b
LDPE plastic with six holes 41.45b
37.53ab
35.54ab
33.28a
LDPE plastic with eight holes 43.45a
38.52a
36.23a
34.48a
SEm (±) 0.66 0.68 0.66 0.63
F-value *** *** *** ***
LSD0.05 1.92 1.96 1.92 1.83
CV, % 5.0 5.6 5.9 6.0
Grand mean 40.18 36.13 33.82 31.45
Means with same letter in column are not significantly different at p = 0.05 by DMRT. Ns = Not Significant, ** significant at p <
0.01, ***significant at p < 0.001 and ns: not significantly different at p > 0.05. SEm± = Standard error of mean, LSD = Least
significant difference, CV = Coefficient of variation and DOS = Days of storage
3.4 Total Soluble Solids(TSS)
TSS of fruits differed significantly (p < 0.05) among the
different storage conditions at only 60 DOS but it did not
differ significantly at 15 DOS, 30 DOS, and 45 DOS (Table
5). At 60 DOS, significantly the highest TSS was observed in
the fruits at room condition with 13.67 ⁰Brix whereas
significantly the lowest TSS was found in the fruits at cellar
storage with 13.00 ⁰Brix.
At 60 DOS, the highest TSS of 14.19 ⁰Brix was found in
control whereas the lowest TSS of 12.77 ⁰Brix was observed
in LDPE plastic packaging with four holes. The increase in
TSS with advancement of storage may be accounted to the
moisture loss, hydrolysis of polysaccharides and
concentration of juice as a result of dehydration. Hussain et
al. (2016) also reported that the increase in TSS is attributed
to the enzymatic conversion of higher polysaccharides such as
starches and pectins into simple sugars during ripening.
Table 5. Effect of storage conditions and plastic packaging on TSS content of mandarin in storage.
Treatments
TSS (⁰Brix)
15 DOS 30 DOS 45 DOS 60 DOS
Storage conditions (Factor A)
Room storage 12.19 13.00 13.06 13.67a
Cellar storage 12.45 12.80 12.92 13.00b
Cool chamber with CoolBot 12.08 12.87 12.83 13.14b
SEm (±) 0.21 0.11 0.12 0.11
F-value Ns Ns Ns ***
LSD0.05 - - - 0.33
Plastic packaging (Factor B)
Control 12.63 13.07a
13.73a
14.19a
LDPE plastic with two holes 12.31 12.73ab
13.04b
13.31b
LDPE plastic with four holes 12.19 13.07a
12.80bc
12.77c
LDPE plastic with six holes 12.01 12.47b
12.70bc
13.11bc
LDPE plastic with eight holes 12.06 13.11a
12.41c
12.95bc
SEm (±) 0.27 0.14 0.15 0.15
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F-value Ns * *** ***
LSD0.05 - 0.42 0.44 0.43
CV, % 6.5 3.3 3.5 3.3
Grand mean 12.24 12.89 12.94 13.27
Means with same letter in column are not significantly different at p = 0.05 by DMRT. NS = Not Significant, ** significant at p <
0.01, ***significant at p < 0.001 and ns: not significantly different at p > 0.05. SEm± = Standard error of mean, LSD = Least
significant difference, CV = Coefficient of variation and DOS = Days of storage
3.5 Titratable acidity (TA)
Titratable acidity differed significantly (p < 0.05)
among the different storage conditions at 15 DOS and 60 DOS
but it did not differ significantly at 30 DOS and 45 DOS (Table
6). Minimum TA was observed in case of control and
maximum TA was observed in case of LDPE plastic
packaging with eight holes.
This might be due to the reason of combined effect
of transpiration and TSS. TA was recorded maximum in case
of LDPE plastic packaging with eight holes as compared to
control which might be due to less oxidation of organic acids
within the plastic package. The present findings are supported
by Santos et al. (2020) and Rokaya et al. (2016).
Table 6. Effect of storage conditions and plastic packaging on TA of mandarin in storage.
Treatments
TA value (%)
15 DOS 30 DOS 45 DOS 60 DOS
Storage conditions (Factor A)
Room storage 1.52b
1.32 1.16 0.9b
Cellar storage 1.46b
1.31 1.20 1.09a
Cool chamber with CoolBot 1.82a
1.36 1.20 1.11a
SEm (±) 0.05 0.04 0.01 0.04
F-value *** Ns Ns ***
LSD0.05 0.14 - - 0.11
Plastic packaging (Factor B)
Control 1.47 1.27 1.14b
0.88c
LDPE plastic with two holes 1.62 1.44 1.20a
1.02bc
LDPE plastic with four holes 1.63 1.33 1.22a
0.99bc
LDPE plastic with six holes 1.62 1.32 1.17ab
1.04b
LDPE plastic with eight holes 1.65 1.30 1.21a
1.22a
SEm (±) 0.06 0.05 0.02 0.05
F-value Ns Ns * **
LSD0.05 - - 0.05 0.14
CV, % 11.8 12.2 4.5 14.2
Grand mean 1.6 1.33 1.19 1.03
Means with same letter in column are not significantly different at p = 0.05 by DMRT. Ns = Not Significant, ** significant at p <
0.01, ***significant at p < 0.001 and ns: not significantly different at p > 0.05. SEm± = Standard error of mean, LSD = Least
significant difference, CV = Coefficient of variation and DOS = Days of storage
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3.6 TSS/TA ratio
The ratio between TSS and TA differed significantly (p <
0.05) among the different storage conditions at 15 DOS and
60 DOS but did not differ significantly at 30 DOS and 45 DOS
(Table 7). At 60 DOS, significantly the highest TSS/TA of
15.24 was found in the fruits kept at room while significantly
the lowest TSS/TA of 11.43 was observed in the cool chamber
with CoolBot. At 60 DOS, significantly the highest ratio of
15.95 was found in the control whereas the lowest ratio of
11.08 was observed in the fruits kept in LDPE plastic
packaging with eight holes.
Table 7. Effect of storage conditions and plastic packaging on TSS/TA ratio of mandarin in storage.
Treatments
TSS/TA ratio
15 DOS 30 DOS 45 DOS 60 DOS
Storage conditions (Factor A)
Room storage 8.12a
9.97 11.40 15.24a
Cellar storage 8.68a
9.89 10.92 12.76b
Cool chamber with CoolBot 6.79b
9.56 10.88 11.43c
SEm (±) 0.22 0.32 0.16 0.38
F-value *** Ns Ns ***
LSD0.05 0.65 - - 1.1
Plastic packaging (Factor B)
Control 8.76a
10.35 12.08a
15.95a
LDPE plastic with two holes 7.74b
8.92 11.05b
13.26b
LDPE plastic with four holes 7.59b
10.05 10.58b
12.16bc
LDPE plastic with six holes 7.61b
9.52 11.10b
13.27b
LDPE plastic with eight holes 7.63b
10.19 10.52b
11.08c
SEm (±) 0.29 0.42 0.21 0.49
F-value * Ns *** ***
LSD0.05 0.87 - 0.61 1.42
CV, % 11.0 12.8 5.7 11.2
Grand mean 7.87 9.81 11.07 13.15
Means with same letter in column are not significantly different at p = 0.05 by DMRT. Ns = Not Significant, ** significant at p <
0.01, ***significant at p < 0.001 and ns: not significantly different at p > 0.05. SEm± = Standard error of mean, LSD = Least
significant difference, CV = Coefficient of variation and DOS = Days of storage
3.7 pH of fruit juice
The pH of juice differed significantly (p < 0.05) among the
different storage conditions at 15 DOS and 30 DOS but it did
not differ significantly at 45 DOS and 60 DOS (Table 8). At
45 DOS, the lowest pH was found in cool chamber with
CoolBot. At 60 DOS, the highest pH was observed in room
condition whereas the lowest was observed in cellar storage.
The pH of juice differed significantly (p < 0.05) among the
different plastic packaging at 15 DOS and 45 DOS but did not
differ significantly at 30 DOS and 60 DOS (Table 8). At 60
DOS, the highest pH of 4.47 was obtained in control.
Higher pH was observed in case of room storage which
was due to higher TSS and lower acidity level. When the
storage period proceeds ahead, the pH of juice was increased
gradually under all the treatments. It may be due to the
utilization of organic acids present in the fruit during
respiration process. The phenomenon of increasing pH during
storage might be due to oxidation of acids in respiration
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process resulting in higher pH which is supported by Islam et
al. (2013).
Table 8. Effect of storage conditions and plastic packaging on pH of mandarin in storage.
Treatments
pH of fruit juice
15 DOS 30 DOS 45 DOS 60 DOS
Storage conditions (Factor A)
Room storage 3.81a
4.29a
4.31 4.47
Cellar storage 3.68b
4.25a
4.28 4.30
Cool chamber with CoolBot 3.79a
4.08b
4.18 4.32
SEm (±) 0.027 0.03 0.05 0.06
F-value ** *** Ns Ns
LSD0.05 0.08 0.09 - -
Plastic packaging (Factor B)
Control 3.83a
4.28 4.39a
4.47
LDPE plastic with two holes 3.76abc
4.15 4.14bc
4.45
LDPE plastic with four holes 3.80ab
4.22 4.12c
4.43
LDPE plastic with six holes 3.69c
4.13 4.24abc
4.14
LDPE plastic with eight holes 3.71bc
4.24 4.34ab
4.34
SEm (±) 0.03 0.04 0.07 0.08
F-value * Ns * Ns
LSD0.05 0.10 - 0.19 -
CV, % 2.8 3.1 4.8 5.8
Grand mean 3.76 4.21 4.24 4.37
Means with same letter in column are not significantly different at p = 0.05 by DMRT. Ns = Not Significant, ** significant at p <
0.01, ***significant at p < 0.001 and ns: not significantly different at p > 0.05. SEm± = Standard error of mean, LSD = Least
significant difference, CV = Coefficient of variation and DOS = Days of storage
3.8 Vitamin C (Ascorbic acid)
The vitamin C content of juice differed significantly (p <
0.05) among the different storage conditions at 30 DOS and
60 DOS but it did not differ significantly at 15 DOS and 45
DOS (Table 9). The reduction in vitamin C during storage is
due to the reason that vitamin C is highly sensitive to
oxidation (Ajibola et al., 2009). Greater amount of vitamin C
at cool chamber with CoolBot might be due to low
temperature at Cool chamber with CoolBot, retarding the
oxidation of vitamin C. Modified atmospheric packaging
(MAP) is able to maintain a low O2 concentration around the
atmosphere of the fruit during storage, thereby retarding the
oxidation of ascorbic acid (Lee et al., 2015). Reddy et
al.(2008) also observed that the highest level of vitamin C
content of acid lime was maintained at LDPE packaging.
LDPE packaging was found to reduce the rate of decrease in
vitamin C content (Poudel et al., 2021).
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Table 9. Effect of storage conditions and plastic packaging on vitamin C content of mandarin in storage.
Treatments
Vitamin C content(mg/100 g)
15 DOS 30 DOS 45 DOS 60 DOS
Storage conditions (Factor A)
Room storage 31.80 29.64b
27.84 25.30b
Cellar storage 31.93 30.56ab
28.38 25.87b
Cool chamber with CoolBot 32.44 30.87a
29.48 27.29a
SEm (±) 0.24 0.33 0.55 0.40
F-value Ns * Ns **
LSD0.05 - 0.98 - 1.17
Plastic packaging (Factor B)
Control 30.63c
27.67d
25.00c
22.22d
LDPE plastic with two holes 31.70b
29.70c
27.52b
24.44c
LDPE plastic with four holes 31.89b
30.56bc
28.85ab
26.22b
LDPE plastic with six holes 32.34b
31.52ab
30.50a
28.76a
LDPE plastic with eight holes 33.74a
32.33a
30.96a
29.11a
SEm (±) 0.31 0.43 0.71 0.52
F-value *** *** ** ***
LSD0.05 0.91 1.26 2.05 1.51
CV, % 2.9 4.3 7.5 6.0
Grand mean 32.06 30.36 28.57 26.15
Means with same letter in column are not significantly different at p = 0.05 by DMRT. Ns = Not Significant, ** significant at p <
0.01, ***significant at p < 0.001 and ns: not significantly different at p > 0.05. SEm± = Standard error of mean, LSD = Least
significant difference, CV = Coefficient of variation and DOS = Days of storage
3.9 Index of absorbance difference (IAD)
Index of absorbance difference (IAD) did not differ
significantly among the different storage conditions at all days
of storage (Table 10). IAD differed significantly (p < 0.05)
among the different plastic packaging at 15 DOS, 45 DOS,
and 60 DOS (Table 10). At 45 DOS and 60 DOS, significantly
the highest IAD value of 0.117 and 0.0074 was observed in
the LDPE plastic packaging with six holes. IAD values of
peaches on-tree ripening were correlated with the amount of
ethylene emitted (Spadoni et al., 2016). In our study, IAD
value was observed low in case of room storage compared to
cellar and cool chamber with CoolBot, which might be due to
the reason that room storage allowed rapid degradation of
chlorophyll due to higher temperature as Chlorophyll a is heat
sensitive in nature.
Table 10. Effect of storage conditions and plastic packaging on index of absorbance difference of mandarin in storage.
Treatments
Index of absorbance difference (IAD)
15 DOS 30 DOS 45 DOS 60 DOS
Storage conditions (Factor A)
Room storage 0.29 0.12 0.063 0.0024
Cellar storage 0.32 0.13 0.064 0.0033
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Cool chamber with CoolBot 0.35 0.19 0.062 0.0039
SEm (±) 0.02 0.02 0.014 0.0011
F-value Ns Ns Ns Ns
LSD0.05 - - - -
Plastic packaging (Factor B)
Control 0.19c
0.11 0.039b
0.0009b
LDPE plastic with two holes 0.36ab
0.15 0.077ab
0.0041ab
LDPE plastic with four holes 0.41a
0.15 0.040b
0.0012b
LDPE plastic with six holes 0.30b
0.16 0.117a
0.0074a
LDPE plastic with eight holes 0.31b
0.14 0.042b
0.0024b
SEm (±) 0.03 0.026 0.018 0.0014
F-value ** Ns * *
LSD0.05 0.09 - 0.054 0.004
CV, % 11.2 12.2 14.9 13.5
Grand mean 0.32 0.14 0.063 0.0032
Means with same letter in column are not significantly different at p = 0.05 by DMRT. Ns = Not Significant, ** significant at p <
0.01, ***significant at p < 0.001 and ns: not significantly different at p > 0.05. SEm± = Standard error of mean, LSD = Least
significant difference, CV = Coefficient of variation and DOS = Days of storage
3.10 Citrus color index (CCI)
Citrus color index (CCI) of mandarin differed
significantly (p < 0.05) among the different storage conditions
at 15 DOS and 45 DOS but it did not differ significantly at 30
DOS and 60 DOS (Table 11). The color values L, a, b showed
a good correlation with the maturity stage of the tomato (Bui
et al., 2010). In our study, greater value of citrus color index
in LDPE plastic packaging with eight holes showed proper
and uniform color development. It might be due to proper air
circulation from the holes creates freshness of fruit with
glossy appearance.
Table 11. Effect of storage conditions and plastic packaging on citrus color index of mandarin in storage.
Treatments
Citrus color index (CCI)
15 DOS 30 DOS 45 DOS 60 DOS
Storage conditions ( Factor A)
Room storage 10.35b
11.93 12.69ab
11.28
Cellar storage 11.44a
12.00 12.14b
11.10
Cool chamber with CoolBot 11.46a
12.32 13.23a
11.56
SEm (±) 0.08 0.17 0.19 0.17
F-value *** Ns ** Ns
LSD0.05 0.24 - 0.55 -
Plastic packaging (Factor B)
Control 9.78e
11.49b
11.94c
10.99
LDPE plastic with two holes 10.74d
11.51b
12.55bc
11.23
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LDPE plastic with four holes 11.34c
12.52a
12.68bc
11.43
LDPE plastic with six holes 11.69b
12.35a
12.77b
11.37
LDPE plastic with eight holes 12.04a
12.54a
13.51a
11.56
SEm (±) 0.10 0.22 0.24 0.22
F-value *** ** ** Ns
LSD0.05 0.31 0.63 0.71 -
CV, % 2.9 5.4 5.8 5.9
Grand mean 11.11 12.08 12.69 11.31
Means with same letter in column are not significantly different at p = 0.05 by DMRT. Ns = Not Significant, ** significant at p <
0.01, ***significant at p < 0.001 and ns: not significantly different at p > 0.05. SEm± = Standard error of mean, LSD = Least
significant difference, CV = Coefficient of variation and DOS = Days of storage
3.11 Shelf Life
The maximum shelf life was observed in case of
LDPE plastic packaging with eight holes in cool chamber with
CoolBot (91 days) and the minimum shelf life was observed
in case of control in room storage (32 days). In a study on
mandarin, maximum shelf life of 48 days was observed in
case of GA3(100ppm) + perforated polyethene compared to
control under room condition (Paudel et al., 2020).
IV. CONCLUSION
This study showed that the use of eight-hole
polyethylene bags combined with CoolBot storage was
effective in preserving the postharvest quality of mandarin
fruits by minimizing physiological loss and maintaining
nutritional content. The combination extended shelf life
significantly compared to ambient conditions and non-
ventilated packaging. Further research across multiple
seasons and commercial storage settings is recommended to
validate these findings.
ETHICAL STATEMENT
Not applicable as the study does not require any
ethical approval.
ACKNOWLEDGEMENTS
The author would like to sincerely thank the staff of
the Department of Horticulture, Agriculture, and Forestry
University (AFU) and the National Citrus Research Program
(NCRP) for providing assistance during the research. Special
thanks to Scientist Sabitri Adhikari, NARC, for her guidance.
The author is also grateful to my friends, juniors, and family
for their constant encouragement.
DISCLOSURE STATEMENT
The authors have no relevant financial and non-
financial interests to disclose. The authors declare that they
have no competing interests.
DATAAVAILABILITY
The data supporting the findings of this study are available
from the corresponding author upon reasonable request.
FUNDING
The authors declare that no funds, grants, or other support
were received during the preparation of this manuscript.
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Glossary
NCRP : National Citrus Research Program
RCBD : Randomized Complete Block
Design
RH : Relative Humidity
% : Percentage
0
C : Degree celsius
TSS : Total Soluble Solid
TA : Titratable Acidity
pH : Potential of hydrogen
DA meter : Delta absorbance meter
DOS : Days of Storage
GDP : Gross Domestic Product
AGDP : Agriculture Gross Domestic Product
PMD : Project Management Directorate
TEPC : Trade and Export Promotion Centre
APP : Agriculture Perspective Plan
MAP : Modified atmosphere packaging
U.S. : United States
MoALD : Ministry of Agriculture and Livestock
Development
g : gram
mg : milligram
m : metre
cm : centimetre
mm : millimetre
ml : millilitre
mt : metric ton
LDPE : Low density polyethylene

Effect of Storage Conditions and Plastic Packaging on Postharvest Quality of Mandarin (Citrus reticulata Blanco.) in Dhankuta, Nepal

  • 1.
    International Journal ofHorticulture, Agriculture and Food Science (IJHAF) ISSN: 2456-8635 [Vol-9, Issue-2, Apr-Jun, 2025] Issue DOI: https://dx.doi.org/10.22161/ijhaf.9.2 Peer-Reviewed Journal Article DOI: https://dx.doi.org/10.22161/ijhaf.9.2.3 (Int. j. hortic. agric. food sci.) https://aipublications.com/ijhaf/ Page | 20 Effect of Storage Conditions and Plastic Packaging on Postharvest Quality of Mandarin (Citrus reticulata Blanco.) in Dhankuta, Nepal Sagar Bhusal1,* , Bibek Acharya2, , Susmita Adhikari1 , Hom Nath Giri3 , Umesh Kumar Acharya5 , Arjun Kumar Shrestha4 , Dipti Adhikari6 and Shruti Shrestha1 1 Department of Horticulture, Agriculture and Forestry University (AFU), Rampur, Chitwan, Nepal 2 Department of Biological Sciences, Simon Fraser University, Burnaby, BC, Canada 3 Chairman, Department of Horticulture, AFU, Rampur, Chitwan, Nepal 4 Dean, Faculty of Agriculture, AFU, Rampur, Chitwan, Nepal 5 Senior Research Scientist, Nepal Agricultural Research Council (NARC) 6 Technical Officer (T6), Nepal Agricultural Research Council (NARC) *Corresponding author Received: 27 May 2025; Received in revised form: 20 May 2025; Accepted: 25 May 2025; Available online: 02 Jun 2025 ©2025 The Author(s). Published by AI Publications. This is an open-access article under the CC BY license (https://creativecommons.org/licenses/by/4.0/) Abstract— Postharvest deterioration significantly affects the shelf life and marketability of mandarin fruit in Nepal. The primary causes are inadequate storage and packaging practices. This study aimed to evaluate the effects of storage conditions and plastic packaging with varying ventilation levels on the postharvest quality of mandarin fruit during storage. A laboratory experiment was conducted during January to March of 2021 to study the effect of storage conditions- room storage (15.98± 0.89 °C, 71.15± 5.80% RH), cellar storage (14.72 ± 1.20 °C, 94.28 ± 5.71% RH) and cool chamber with CoolBot (8.12 ± 0.44 °C, 79.43 ± 4.54% RH) and different plastic packaging of 25 micron: two, four, six and eight holes plastic and control (open tray). The experiment was laid out in factorial randomized complete block design with three replications. Result revealed that the lowest physiological loss in weight (9%) was recorded under CoolBot with 8 holes packaging, while the highest (23.66%) was in control under room storage. The highest total soluble solids (14.19 °brix) and the lowest titratable acid (0.88%) were observed in the control. Greater vitamin-C content was observed in CoolBot storage and 8 holes plastic packaging (27.29 mg/100g and 29.11 mg/100g respectively). The longest shelf life (91 days) was found under CoolBot storage with 8 holes plastic packaging as compared to control in room storage (32 days). Further validation across multiple seasons and commercial production settings is recommended. Keywords— Mandarin, CoolBot, polyethene packaging, shelf life, postharvest quality, storage conditions, preliminary study. I. INTRODUCTION Citrus fruits (genus Citrus; family Rutaceae) are specialized form of berry, named hesperidium, characterized by a juicy pulp made of vesicles within segments (Strano et al., 2017). Citrus, particularly the mandarin orange is the most important and highly commercialized fruit crop in the hills of Nepal. Mandarin is a group name for a class of citrus fruit with thin and loose peel. Mandarin (Citrus reticulata Blanco) is a most potent fruit crop that stands in first position of the total fruit industry in Nepal. The mid-hill region (1000 to 1500 m altitude) has a comparative advantage in the cultivation of
  • 2.
    Bhusal et al.International Journal of Horticulture, Agriculture and Food Science (IJHAF) 9(2)-2025 Article DOI: https://dx.doi.org/10.22161/ijhaf.9.2.3 (Int. j. hortic. agric. food sci.) https://aipublications.com/ijhaf/ Page | 21 citrus fruits, especially mandarin and sweet orange (Bhattarai et al., 2013). It shares 0.97 % in AGDP and 0.33 % in GDP (PMD, 2002). The country exports mandarin to India, China, Bangladesh, Bhutan, Pakistan and other countries, is about 600 mt annually (TEPC, 2013). The postharvest losses of citrus in South Asian region are estimated as 20% (Ladaniya, 2015). Diseases and pests, delay harvest, poor roads, cold storage conditions and glut cause these losses. But the attack of the blue mould (Penicillium italicum) and green mould (P. digitatum) causes postharvest decays of citrus fruits in cold storage as well as in open citrus fruits and pollutes the environment as well. Different packaging practices and storage helps to reduce post-harvest diseases and prolongs the shelf life of mandarin. Storage of citrus is essential in order to prolong their usability which aims to slow down the respiration, transpiration, and development of pathological or physiological disorders so that the commodity could be preserved for longer in the most usable form. By proper storage, undesirable processes like rotting, sprouting, toughening, ripening and greening process are minimized. According to Shrestha et al. (1993) most important factors for storage are the commodity itself, the physiochemical environment, and the microbial environment. The commodity should be properly matured, healthy, and should be able to tolerate adverse environmental conditions. Despite the importance of citrus to Nepalese horticulture, high postharvest losses remain a critical barrier to profitability for smallholder growers. Improving shelf life through better storage and packaging can reduce waste and increase value, but research in this area remains limited. Given the lack of low-cost storage trials for mandarin in Nepal, this study aims to provide insights into how packaging ventilation and storage conditions affect postharvest quality, with the goal of identifying promising solutions for reducing losses. II. MATERIALS AND METHODS 2.1. Research Location This study was conducted at the laboratory of the National Citrus Research Program (NCRP), located in Paripatle, Dhankuta, Nepal. The fruits used in the experiment were harvested from the orchard of NCRP. Dhankuta is a mid- hill district situated in Koshi province of Nepal, situated between 26°53' to 27°19' N latitude and 87°08' to 88°33' E longitude. The experimental site lies at an elevation ranging from 1100 to 1400 meters above sea level. 2.2 Experimental design and treatments The research was laid out in Factorial Randomized Complete Block Design (RCBD) with 15 treatments combination and replicated three times. The mandarins were kept in five different types of packaging materials (P1- Tray (control), P2- Plastic bag with 2 holes, P3- Plastic bag with 4 holes, P4- Plastic bag with 6 holes and P5- Plastic bag with 8 holes) and kept in three different storage conditions (S1- Room storage, S2- Cellar storage and S3- CoolBot storage). The detailed treatment combinations are given in Table 1. Table 1. Treatment combinations of storage condition and plastic packaging of mandarin S.N. Treatment Symbol Treatment combination 1 T1 S1P1 Room storage + Control 2 T2 S1P2 Room storage + 2 holes plastic packaging 3 T3 S1P3 Room storage + 4 holes plastic packaging 4 T4 S1P4 Room storage + 6 holes plastic packaging 5 T5 S1P5 Room storage + 8 holes plastic packaging 6 T6 S2P1 Cellar storage + Control 7 T7 S2P2 Cellar storage + 2 holes plastic packaging 8 T8 S2P3 Cellar storage + 4 holes plastic packaging 9 T9 S2P4 Cellar storage + 6 holes plastic packaging 10 T10 S2P5 Cellar storage + 8 holes plastic packaging 11 T11 S3P1 CoolBot storage + Control 12 T12 S3P2 CoolBot storage + 2 holes plastic packaging
  • 3.
    Bhusal et al.International Journal of Horticulture, Agriculture and Food Science (IJHAF) 9(2)-2025 Article DOI: https://dx.doi.org/10.22161/ijhaf.9.2.3 (Int. j. hortic. agric. food sci.) https://aipublications.com/ijhaf/ Page | 22 13 T13 S3P3 CoolBot storage + 4 holes plastic packaging 14 T14 S3P4 CoolBot storage + 6 holes plastic packaging 15 T15 S3P5 CoolBot storage + 8 holes plastic packaging Each treatment comprised 4 polyethylene bags (25 microns) containing 10 fruits per bag. One bag per treatment was designated for non-destructive observations, while the remaining bags were used for destructive sampling at scheduled intervals. 2.3 Pre-storage fruit handling Mature, yellowish mandarin fruits- cultivar Khoku Local were carefully harvested from the orchard of the National Citrus Research Program (NCRP) using secateurs to minimize mechanical damage. The fruits were then brought to the laboratory, where they were sorted and graded based on size, uniformity, and absence of visible defects. Following sorting, the fruits were washed in tap water for two minutes to remove any adhering dirt or debris and subsequently air-dried in the shade for 2–3 hours. To strengthen the peel and reduce postharvest decay, the fruits were dipped in a 4 g/L solution of Chlorocal (calcium chloride) for four minutes and then allowed to dry again under shade conditions. A thin, uniform layer of wax was gently applied to the peel surface by hand to reduce moisture loss and improve external appearance. Finally, the waxed fruits were left to dry for an additional two hours before packaging and storage. 2.4. Packaging and Storage Plastic bags (25 microns) were punched with holes (2, 4, 6, and 8) of 5 mm diameter using a punching machine. Ten fruits were packed per bag, and the bag openings were sealed using rubber bands. Bags were then placed in their designated storage structures (Room, Cellar, or CoolBot). 2.5. Data Collection Both non-destructive and destructive observations were made throughout the storage period. Non-destructive data included Physiological loss in weight (PLW) and Decay loss whereas, destructive data included Total Soluble Solids (TSS), Titratable Acidity (TA) and Vitamin C content. 2.5.1 Physiological loss in weight (PLW) Weight loss was recorded at weekly interval over the storage period. A digital sensitive balance was used to record the fruit weight. Weight loss was calculated according the methods described by Joshi et al. (2020). 𝑃𝐿𝑊 (%) = {(W0 – Wt. ) ÷ W0} ∗ 100 Where, PLW is the physiological loss in weight, W0 is the initial fruit weight and Wt. is the weight of fruits at the designated time. 2.5.2 Decay loss The fruits of mandarin were visually evaluated for the symptoms of decay. Decay loss was recorded at weekly interval basis. 𝐷𝑒𝑐𝑎𝑦 𝑙𝑜𝑠𝑠 (%) = (𝑀𝑎𝑠𝑠 𝑜𝑓 𝑑𝑒𝑐𝑎𝑦𝑒𝑑 𝑓𝑟𝑢𝑖𝑡 ÷ 𝑇𝑜𝑡𝑎𝑙 𝑚𝑎𝑠𝑠 𝑜𝑓 𝑓𝑟𝑢𝑖𝑡) ∗ 100 2.5.3 Juice percentage The juice content was taken from three destructive sample by squeezing through manual methods at every 15 days interval. Juice percentage per fruit was obtained from the following formula adopted by Joshi et al. (2020). 𝐽𝑢𝑖𝑐𝑒 𝑐𝑜𝑛𝑡𝑒𝑛𝑡 (%) = (𝐽𝑢𝑖𝑐𝑒 𝑤𝑒𝑖𝑔ℎ𝑡 𝑝𝑒𝑟 𝑓𝑟𝑢𝑖𝑡 ÷ 𝐼𝑛𝑑𝑖𝑣𝑖𝑑𝑢𝑎𝑙 𝑓𝑟𝑢𝑖𝑡 𝑤𝑒𝑖𝑔ℎ𝑡) ∗ 100 2.5.4 Total soluble solids (TSS) TSS was determined by using Pal Brix-Acidity meter. Two to three drops of clear fruit juice were placed on the prism of the instrument for TSS determination. It was measured in ºBrix. 2.5.5 Titratable acidity (TA) The extracted fruit juice was diluted to the ratio of 1:50 and TA was recorded using Pal Brix-Acidity meter by placing 1-2 drops of diluted juice on the prism surface. TAwas measured in terms of percentage. 2.5.6 TSS/TA ratio 𝑇𝑆𝑆 𝑇𝐴 = 𝑇𝑜𝑡𝑎𝑙 𝑠𝑜𝑙𝑢𝑏𝑙𝑒 ÷ 𝑇𝑖𝑡𝑟𝑎𝑡𝑎𝑏𝑙𝑒 𝑎𝑐𝑖𝑑𝑖𝑡𝑦 2.5.7 pH of fruit juice pH of the sample fruit was measured with the help of digital pH meter. 2.5.8 Vitamin C (Ascorbic acid) The ascorbic acid of the fruit was measured by volumetric method as per the reference from Sadasivsm and Manickam (1991). Following formula was used to calculate the ascorbic acid content.
  • 4.
    Bhusal et al.International Journal of Horticulture, Agriculture and Food Science (IJHAF) 9(2)-2025 Article DOI: https://dx.doi.org/10.22161/ijhaf.9.2.3 (Int. j. hortic. agric. food sci.) https://aipublications.com/ijhaf/ Page | 23 𝐴𝑚𝑜𝑢𝑛𝑡 𝑜𝑓 𝑎𝑠𝑐𝑜𝑟𝑏𝑖𝑐 𝑎𝑐𝑖𝑑 ( 𝑚𝑔 100𝑔 ) = (0.5 𝑚𝑔 ∗ 𝑉2 ∗ 100 ∗ 100) (𝑉1 ∗ 5 𝑚𝑙 ∗ 𝑤𝑒𝑖𝑔ℎ𝑡 𝑜𝑓 𝑗𝑢𝑖𝑐𝑒) Where, V1 = amount of dye consumed during titration, V2 = Amount of dye consumed when supernatant was titrated with 4% oxalic acid It was determined at the fortnightly interval. The titration was done using the 2,6- dichlorophenolindophenol method (Antoniali et al., 2007) 2.5.9 Index of absorbance difference (IAD) Index of absorbance difference (IAD) was measured using Delta absorbance (DA) meter. The DAmeter emits LED light to fruit skin and measures the amount of light reflected back (Cai & Farcuh, 2021). 2.5.10 Citrus color index (CCI) Color index of the fruit skin was determined by using Chroma meter (CR-400). Three values i.e. L, a, and b were recorded. The value “L” represents lightness, its value ranges from 0 to 100, more black colors close to zero and more white colors close to 100. The value “a” represents the redness, and the value “b” represents the yellowness. On the basis of the values L, a, and b, citrus color index (CCI) was calculated according to the formula given by Pandey et al. (2021). 𝐶𝐶𝐼 = { (1000 ∗ 𝑎) 𝐿 ∗ 𝑏 } 2.5.11 Shelf life Shelf life was determined by visual observation of non- destructive sample. The fruit lots will be considered to have reached the end of shelf life when 50% of fruits showed visual observation of shrinkage or spoilage due to pathogens. 2.6 Statistical Analysis The collected data was compiled in MS–excel program and analysis of variance for all parameters was done by using Genstat 15 Edition statistical computer package for Factorial Randomized Complete Block Design. Duncan`s Multiple Range Test (DMRT) for the mean separations was done from the reference of Gomez and Gomez (1984). Table and Graph was constructed by using the MS- word and excel computer software program. III. RESULTS AND DISCUSSION The following results present the combined effects of storage conditions and plastic packaging with varying ventilation level on key quality parameters including physiological weight loss, vitamin C content, total soluble solids, titratable acidity, and visual deterioration over time. 3.1 Physiological loss in weight Physiological loss in weight (PLW) differed significantly (p < 0.05) among the different storage conditions at 7 days of storage (DOS), 28 DOS, 35 DOS, 42 DOS, and 49 DOS but it did not differ significantly at 14 DOS and 21 DOS (Table 2). Physiological loss in weight (PLW) differed significantly (p < 0.05) among the different plastic packaging in all days interval (Table 2). Higher PLW was observed in case of room storage, intermediate was observed in case of cellar storage and lower percentage of PLW was observed in case of cool chamber with CoolBot, which might be due to the reason that the higher temperature in the room storage leads to greater transpiration resulting in higher physiological loss in weight. In Mandarin, it was observed that lower temperatures were found to reduce weight loss in all treatments (Lambrinou & Papadopoulou, 1995). Significantly the lower physiological loss in weight was observed in case of perforated polyethene (2.38%) compared to control (19.08%) at 24 days of storage (Paudel et al., 2020; Acharya et al., 2020). The highest PLW at 45 days of storage of Kagzi Lime was observed in case of control (33.46%) while fruits stored in MAP showed a minimum PLW (1.04%) (Hayat et al., 2017). Table 2. Effect of storage conditions and plastic packaging on physiological loss in weight of mandarin during storage. Treatments Physiological loss in weight (%) 7 DOS 14 DOS 21 DOS 28 DOS 35 DOS 42 DOS 49 DOS Storage conditions (Factor A) Room storage 2.59a 4.66 7.09 8.60a 10.72a 12.53a 16.93a Cellar storage 2.41a 4.99 7.10 8.81a 10.27a 10.99b 15.27b Cool chamber with CoolBot 0.92b 4.14 6.86 7.48b 8.38b 10.13b 12.87c
  • 5.
    Bhusal et al.International Journal of Horticulture, Agriculture and Food Science (IJHAF) 9(2)-2025 Article DOI: https://dx.doi.org/10.22161/ijhaf.9.2.3 (Int. j. hortic. agric. food sci.) https://aipublications.com/ijhaf/ Page | 24 SEm (±) 0.15 0.26 0.48 0.33 0.46 0.49 0.25 F-value *** Ns Ns * ** *** *** LSD0.05 0.44 - - 0.94 1.33 1.09 0.72 Plastic packaging (Factor B) Control 2.64a 5.75a 8.97a 12.26a 14.18a 16.54a 21.89a LDPE plastic with two holes 2.19ab 4.54bc 6.99b 8.08b 11.10b 12.44b 15.67b LDPE plastic with four holes 1.79bc 4.15bc 6.87b 7.02b 7.80c 9.90c 14.00c LDPE plastic with six holes 1.84bc 4.86ab 6.74b 7.07b 8.12c 9.00cd 12.67d LDPE plastic with eight holes 1.41c 3.68c 5.49b 7.07b 7.33c 8.21d 10.89e SEm (±) 0.20 0.34 0.63 0.42 0.59 0.49 0.32 F-value ** ** * *** *** *** *** LSD0.05 0.57 0.98 1.8 1.22 1.72 1.41 0.93 CV, % 12.7 19.3 13.5 15.3 14.7 13.1 8.4 Grand mean 1.97 4.60 7.01 8.30 9.79 11.22 15.02 Means with same letter in column are not significantly different at p = 0.05 by DMRT. Ns = Not Significant, ** significant at p < 0.01, ***significant at p < 0.001 and ns: not significantly different at p > 0.05. SEm± = Standard error of mean, LSD = Least significant difference, CV = Coefficient of variation and DOS = Days of storage 3.2 Decay loss Decay loss differed significantly (p < 0.05) among the different storage conditions at 7 days of storage (DOS), 28 DOS, 35 DOS, and 42 DOS but it did not differ significantly at 14 DOS, 21 DOS, and 49 DOS (Table 3). At 7 DOS, significantly the highest decay loss of 2.12% was observed in room condition while no decay loss was observed at all in the cool chamber with CoolBot. At 49 DOS, the highest decay loss of 12.51% was observed in the room condition while the lowest decay loss of 9.22% was observed in the cool chamber with CoolBot. At 7 DOS, the highest decay loss of 1.55% was observed in the LDPE plastic packaging with two holes while the lowest decay loss of 0.69% was found in the LDPE plastic packaging with eight holes. At 49 DOS, the highest decay loss of 12.00% was found in the control condition while the lowest decay loss of 9.02% was found in the LDPE plastic packaging with eight holes. Higher decay loss in room storage compared to cellar and cool chamber with CoolBot might be due to higher temperature in room storage, as higher temperature accounted for invasive disease development. The result is in line with Talukder et al. (2015) who reported the highest fruit decay in mandarin without polybag and the lowest observed in 0.5% perforated polybag and kept at 5°C during 90 days of storage period, which indicates that temperature has greater role in decay. Table 3. Effect of storage conditions and plastic packaging on decay loss of mandarin in storage. Treatments Decay loss (%) 7 DOS 14 DOS 21 DOS 28 DOS 35 DOS 42 DOS 49 DOS Storage conditions (Factor A) Room storage 2.12a 2.53 4.49 5.46a 8.33a 9.51a 12.51 Cellar storage 1.27b 2.4 4.27 5.41a 7.01ab 7.82b 10.68 Cool chamber with CoolBot 0.00c 1.8 3.47 3.87b 5.02b 6.23b 9.22 SEm (±) 0.24 0.31 0.38 0.39 0.89 0.55 0.96 F-value *** Ns Ns * * ** Ns
  • 6.
    Bhusal et al.International Journal of Horticulture, Agriculture and Food Science (IJHAF) 9(2)-2025 Article DOI: https://dx.doi.org/10.22161/ijhaf.9.2.3 (Int. j. hortic. agric. food sci.) https://aipublications.com/ijhaf/ Page | 25 LSD0.05 0.71 - - 1.13 2.56 1.58 - Plastic packaging (Factor B) Control 1.22 3.00 4.71 5.62 8.56 9.56 12.00 LDPE plastic with two holes 1.55 2.44 4.44 5.24 7.88 9.10 11.30 LDPE plastic with four holes 1.29 2.11 4.44 5.34 6.40 8.03 10.36 LDPE plastic with six holes 0.88 2.00 4.026 4.69 5.61 7.76 10.15 LDPE plastic with eight holes 0.69 1.67 3.82 4.17 5.49 7.52 9.02 SEm (±) 0.31 0.40 0.50 0.50 1.14 0.71 1.24 F-value Ns Ns Ns Ns Ns Ns Ns LSD0.05 - - - - - - - CV, % 18.2 15.4 14.3 19.6 25 17.8 21.4 Grand mean 1.13 2.24 4.21 5.02 6.79 8.56 11.13 Means with same letter in column are not significantly different at p = 0.05 by DMRT. Ns = Not Significant, ** significant at p < 0.01, ***significant at p < 0.001 and ns: not significantly different at p > 0.05. SEm± = Standard error of mean, LSD = Least significant difference, CV = Coefficient of variation and DOS = Days of storage 3.3 Juice percentage Juice percentage did not differed significantly (p < 0.05) among the different storage conditions at all days of data recording (Table 4). Juice percentage was found to decrease with the increase in storage duration in all storage conditions. At 60 DOS, the juice percentage of 31.68% was found to be the highest in cool chamber with CoolBot. Juice percentage differed significantly (p < 0.05) among the different plastic packaging at all days of storage (Table 4). At 45 DOS, the highest juice percentage of 36.23% was found in LDPE plastic packaging with eight holes. The perforated plastic created the modified atmospheric environment acting as a barrier which reduced the moisture loss from the fruit attributed by low respiration and transpiration rate resulting in the higher juice percentage (Bhattarai & Shah, 2017). Ahamad and Siddiqui (2013) reported higher juice percentage in case of PE-packed fruits followed by the fruits with 100% Sta-Fresh 960 which might be due to less water loss in PE-packaging and waxing treatments as the combination acts as a barrier to moisture loss. Maximum juice percentage was observed in case of GA3+ perforated polyethene (40.30%) compared to control (32.63%) during 24 DOS of mandarin (Paudel et al., 2020). Table 4. Effect of storage conditions and plastic packaging on juice percentage of mandarin in storage. Treatments Juice Percentage 15 DOS 30 DOS 45 DOS 60 DOS Storage conditions (Factor A) Room storage 39.47 35.81 33.52 31.17 Cellar storage 40.00 35.96 33.73 31.52 Cool chamber with CoolBot 41.08 36.62 34.20 31.68 SEm (±) 0.51 0.52 0.51 0.49 F-value Ns Ns Ns Ns LSD0.05 - - - - Plastic packaging (Factor B) Control 36.46c 32.79c 30.72d 28.40c
  • 7.
    Bhusal et al.International Journal of Horticulture, Agriculture and Food Science (IJHAF) 9(2)-2025 Article DOI: https://dx.doi.org/10.22161/ijhaf.9.2.3 (Int. j. hortic. agric. food sci.) https://aipublications.com/ijhaf/ Page | 26 LDPE plastic with two holes 39.67b 35.49b 32.72c 29.95bc LDPE plastic with four holes 39.88b 36.33b 33.88bc 31.17b LDPE plastic with six holes 41.45b 37.53ab 35.54ab 33.28a LDPE plastic with eight holes 43.45a 38.52a 36.23a 34.48a SEm (±) 0.66 0.68 0.66 0.63 F-value *** *** *** *** LSD0.05 1.92 1.96 1.92 1.83 CV, % 5.0 5.6 5.9 6.0 Grand mean 40.18 36.13 33.82 31.45 Means with same letter in column are not significantly different at p = 0.05 by DMRT. Ns = Not Significant, ** significant at p < 0.01, ***significant at p < 0.001 and ns: not significantly different at p > 0.05. SEm± = Standard error of mean, LSD = Least significant difference, CV = Coefficient of variation and DOS = Days of storage 3.4 Total Soluble Solids(TSS) TSS of fruits differed significantly (p < 0.05) among the different storage conditions at only 60 DOS but it did not differ significantly at 15 DOS, 30 DOS, and 45 DOS (Table 5). At 60 DOS, significantly the highest TSS was observed in the fruits at room condition with 13.67 ⁰Brix whereas significantly the lowest TSS was found in the fruits at cellar storage with 13.00 ⁰Brix. At 60 DOS, the highest TSS of 14.19 ⁰Brix was found in control whereas the lowest TSS of 12.77 ⁰Brix was observed in LDPE plastic packaging with four holes. The increase in TSS with advancement of storage may be accounted to the moisture loss, hydrolysis of polysaccharides and concentration of juice as a result of dehydration. Hussain et al. (2016) also reported that the increase in TSS is attributed to the enzymatic conversion of higher polysaccharides such as starches and pectins into simple sugars during ripening. Table 5. Effect of storage conditions and plastic packaging on TSS content of mandarin in storage. Treatments TSS (⁰Brix) 15 DOS 30 DOS 45 DOS 60 DOS Storage conditions (Factor A) Room storage 12.19 13.00 13.06 13.67a Cellar storage 12.45 12.80 12.92 13.00b Cool chamber with CoolBot 12.08 12.87 12.83 13.14b SEm (±) 0.21 0.11 0.12 0.11 F-value Ns Ns Ns *** LSD0.05 - - - 0.33 Plastic packaging (Factor B) Control 12.63 13.07a 13.73a 14.19a LDPE plastic with two holes 12.31 12.73ab 13.04b 13.31b LDPE plastic with four holes 12.19 13.07a 12.80bc 12.77c LDPE plastic with six holes 12.01 12.47b 12.70bc 13.11bc LDPE plastic with eight holes 12.06 13.11a 12.41c 12.95bc SEm (±) 0.27 0.14 0.15 0.15
  • 8.
    Bhusal et al.International Journal of Horticulture, Agriculture and Food Science (IJHAF) 9(2)-2025 Article DOI: https://dx.doi.org/10.22161/ijhaf.9.2.3 (Int. j. hortic. agric. food sci.) https://aipublications.com/ijhaf/ Page | 27 F-value Ns * *** *** LSD0.05 - 0.42 0.44 0.43 CV, % 6.5 3.3 3.5 3.3 Grand mean 12.24 12.89 12.94 13.27 Means with same letter in column are not significantly different at p = 0.05 by DMRT. NS = Not Significant, ** significant at p < 0.01, ***significant at p < 0.001 and ns: not significantly different at p > 0.05. SEm± = Standard error of mean, LSD = Least significant difference, CV = Coefficient of variation and DOS = Days of storage 3.5 Titratable acidity (TA) Titratable acidity differed significantly (p < 0.05) among the different storage conditions at 15 DOS and 60 DOS but it did not differ significantly at 30 DOS and 45 DOS (Table 6). Minimum TA was observed in case of control and maximum TA was observed in case of LDPE plastic packaging with eight holes. This might be due to the reason of combined effect of transpiration and TSS. TA was recorded maximum in case of LDPE plastic packaging with eight holes as compared to control which might be due to less oxidation of organic acids within the plastic package. The present findings are supported by Santos et al. (2020) and Rokaya et al. (2016). Table 6. Effect of storage conditions and plastic packaging on TA of mandarin in storage. Treatments TA value (%) 15 DOS 30 DOS 45 DOS 60 DOS Storage conditions (Factor A) Room storage 1.52b 1.32 1.16 0.9b Cellar storage 1.46b 1.31 1.20 1.09a Cool chamber with CoolBot 1.82a 1.36 1.20 1.11a SEm (±) 0.05 0.04 0.01 0.04 F-value *** Ns Ns *** LSD0.05 0.14 - - 0.11 Plastic packaging (Factor B) Control 1.47 1.27 1.14b 0.88c LDPE plastic with two holes 1.62 1.44 1.20a 1.02bc LDPE plastic with four holes 1.63 1.33 1.22a 0.99bc LDPE plastic with six holes 1.62 1.32 1.17ab 1.04b LDPE plastic with eight holes 1.65 1.30 1.21a 1.22a SEm (±) 0.06 0.05 0.02 0.05 F-value Ns Ns * ** LSD0.05 - - 0.05 0.14 CV, % 11.8 12.2 4.5 14.2 Grand mean 1.6 1.33 1.19 1.03 Means with same letter in column are not significantly different at p = 0.05 by DMRT. Ns = Not Significant, ** significant at p < 0.01, ***significant at p < 0.001 and ns: not significantly different at p > 0.05. SEm± = Standard error of mean, LSD = Least significant difference, CV = Coefficient of variation and DOS = Days of storage
  • 9.
    Bhusal et al.International Journal of Horticulture, Agriculture and Food Science (IJHAF) 9(2)-2025 Article DOI: https://dx.doi.org/10.22161/ijhaf.9.2.3 (Int. j. hortic. agric. food sci.) https://aipublications.com/ijhaf/ Page | 28 3.6 TSS/TA ratio The ratio between TSS and TA differed significantly (p < 0.05) among the different storage conditions at 15 DOS and 60 DOS but did not differ significantly at 30 DOS and 45 DOS (Table 7). At 60 DOS, significantly the highest TSS/TA of 15.24 was found in the fruits kept at room while significantly the lowest TSS/TA of 11.43 was observed in the cool chamber with CoolBot. At 60 DOS, significantly the highest ratio of 15.95 was found in the control whereas the lowest ratio of 11.08 was observed in the fruits kept in LDPE plastic packaging with eight holes. Table 7. Effect of storage conditions and plastic packaging on TSS/TA ratio of mandarin in storage. Treatments TSS/TA ratio 15 DOS 30 DOS 45 DOS 60 DOS Storage conditions (Factor A) Room storage 8.12a 9.97 11.40 15.24a Cellar storage 8.68a 9.89 10.92 12.76b Cool chamber with CoolBot 6.79b 9.56 10.88 11.43c SEm (±) 0.22 0.32 0.16 0.38 F-value *** Ns Ns *** LSD0.05 0.65 - - 1.1 Plastic packaging (Factor B) Control 8.76a 10.35 12.08a 15.95a LDPE plastic with two holes 7.74b 8.92 11.05b 13.26b LDPE plastic with four holes 7.59b 10.05 10.58b 12.16bc LDPE plastic with six holes 7.61b 9.52 11.10b 13.27b LDPE plastic with eight holes 7.63b 10.19 10.52b 11.08c SEm (±) 0.29 0.42 0.21 0.49 F-value * Ns *** *** LSD0.05 0.87 - 0.61 1.42 CV, % 11.0 12.8 5.7 11.2 Grand mean 7.87 9.81 11.07 13.15 Means with same letter in column are not significantly different at p = 0.05 by DMRT. Ns = Not Significant, ** significant at p < 0.01, ***significant at p < 0.001 and ns: not significantly different at p > 0.05. SEm± = Standard error of mean, LSD = Least significant difference, CV = Coefficient of variation and DOS = Days of storage 3.7 pH of fruit juice The pH of juice differed significantly (p < 0.05) among the different storage conditions at 15 DOS and 30 DOS but it did not differ significantly at 45 DOS and 60 DOS (Table 8). At 45 DOS, the lowest pH was found in cool chamber with CoolBot. At 60 DOS, the highest pH was observed in room condition whereas the lowest was observed in cellar storage. The pH of juice differed significantly (p < 0.05) among the different plastic packaging at 15 DOS and 45 DOS but did not differ significantly at 30 DOS and 60 DOS (Table 8). At 60 DOS, the highest pH of 4.47 was obtained in control. Higher pH was observed in case of room storage which was due to higher TSS and lower acidity level. When the storage period proceeds ahead, the pH of juice was increased gradually under all the treatments. It may be due to the utilization of organic acids present in the fruit during respiration process. The phenomenon of increasing pH during storage might be due to oxidation of acids in respiration
  • 10.
    Bhusal et al.International Journal of Horticulture, Agriculture and Food Science (IJHAF) 9(2)-2025 Article DOI: https://dx.doi.org/10.22161/ijhaf.9.2.3 (Int. j. hortic. agric. food sci.) https://aipublications.com/ijhaf/ Page | 29 process resulting in higher pH which is supported by Islam et al. (2013). Table 8. Effect of storage conditions and plastic packaging on pH of mandarin in storage. Treatments pH of fruit juice 15 DOS 30 DOS 45 DOS 60 DOS Storage conditions (Factor A) Room storage 3.81a 4.29a 4.31 4.47 Cellar storage 3.68b 4.25a 4.28 4.30 Cool chamber with CoolBot 3.79a 4.08b 4.18 4.32 SEm (±) 0.027 0.03 0.05 0.06 F-value ** *** Ns Ns LSD0.05 0.08 0.09 - - Plastic packaging (Factor B) Control 3.83a 4.28 4.39a 4.47 LDPE plastic with two holes 3.76abc 4.15 4.14bc 4.45 LDPE plastic with four holes 3.80ab 4.22 4.12c 4.43 LDPE plastic with six holes 3.69c 4.13 4.24abc 4.14 LDPE plastic with eight holes 3.71bc 4.24 4.34ab 4.34 SEm (±) 0.03 0.04 0.07 0.08 F-value * Ns * Ns LSD0.05 0.10 - 0.19 - CV, % 2.8 3.1 4.8 5.8 Grand mean 3.76 4.21 4.24 4.37 Means with same letter in column are not significantly different at p = 0.05 by DMRT. Ns = Not Significant, ** significant at p < 0.01, ***significant at p < 0.001 and ns: not significantly different at p > 0.05. SEm± = Standard error of mean, LSD = Least significant difference, CV = Coefficient of variation and DOS = Days of storage 3.8 Vitamin C (Ascorbic acid) The vitamin C content of juice differed significantly (p < 0.05) among the different storage conditions at 30 DOS and 60 DOS but it did not differ significantly at 15 DOS and 45 DOS (Table 9). The reduction in vitamin C during storage is due to the reason that vitamin C is highly sensitive to oxidation (Ajibola et al., 2009). Greater amount of vitamin C at cool chamber with CoolBot might be due to low temperature at Cool chamber with CoolBot, retarding the oxidation of vitamin C. Modified atmospheric packaging (MAP) is able to maintain a low O2 concentration around the atmosphere of the fruit during storage, thereby retarding the oxidation of ascorbic acid (Lee et al., 2015). Reddy et al.(2008) also observed that the highest level of vitamin C content of acid lime was maintained at LDPE packaging. LDPE packaging was found to reduce the rate of decrease in vitamin C content (Poudel et al., 2021).
  • 11.
    Bhusal et al.International Journal of Horticulture, Agriculture and Food Science (IJHAF) 9(2)-2025 Article DOI: https://dx.doi.org/10.22161/ijhaf.9.2.3 (Int. j. hortic. agric. food sci.) https://aipublications.com/ijhaf/ Page | 30 Table 9. Effect of storage conditions and plastic packaging on vitamin C content of mandarin in storage. Treatments Vitamin C content(mg/100 g) 15 DOS 30 DOS 45 DOS 60 DOS Storage conditions (Factor A) Room storage 31.80 29.64b 27.84 25.30b Cellar storage 31.93 30.56ab 28.38 25.87b Cool chamber with CoolBot 32.44 30.87a 29.48 27.29a SEm (±) 0.24 0.33 0.55 0.40 F-value Ns * Ns ** LSD0.05 - 0.98 - 1.17 Plastic packaging (Factor B) Control 30.63c 27.67d 25.00c 22.22d LDPE plastic with two holes 31.70b 29.70c 27.52b 24.44c LDPE plastic with four holes 31.89b 30.56bc 28.85ab 26.22b LDPE plastic with six holes 32.34b 31.52ab 30.50a 28.76a LDPE plastic with eight holes 33.74a 32.33a 30.96a 29.11a SEm (±) 0.31 0.43 0.71 0.52 F-value *** *** ** *** LSD0.05 0.91 1.26 2.05 1.51 CV, % 2.9 4.3 7.5 6.0 Grand mean 32.06 30.36 28.57 26.15 Means with same letter in column are not significantly different at p = 0.05 by DMRT. Ns = Not Significant, ** significant at p < 0.01, ***significant at p < 0.001 and ns: not significantly different at p > 0.05. SEm± = Standard error of mean, LSD = Least significant difference, CV = Coefficient of variation and DOS = Days of storage 3.9 Index of absorbance difference (IAD) Index of absorbance difference (IAD) did not differ significantly among the different storage conditions at all days of storage (Table 10). IAD differed significantly (p < 0.05) among the different plastic packaging at 15 DOS, 45 DOS, and 60 DOS (Table 10). At 45 DOS and 60 DOS, significantly the highest IAD value of 0.117 and 0.0074 was observed in the LDPE plastic packaging with six holes. IAD values of peaches on-tree ripening were correlated with the amount of ethylene emitted (Spadoni et al., 2016). In our study, IAD value was observed low in case of room storage compared to cellar and cool chamber with CoolBot, which might be due to the reason that room storage allowed rapid degradation of chlorophyll due to higher temperature as Chlorophyll a is heat sensitive in nature. Table 10. Effect of storage conditions and plastic packaging on index of absorbance difference of mandarin in storage. Treatments Index of absorbance difference (IAD) 15 DOS 30 DOS 45 DOS 60 DOS Storage conditions (Factor A) Room storage 0.29 0.12 0.063 0.0024 Cellar storage 0.32 0.13 0.064 0.0033
  • 12.
    Bhusal et al.International Journal of Horticulture, Agriculture and Food Science (IJHAF) 9(2)-2025 Article DOI: https://dx.doi.org/10.22161/ijhaf.9.2.3 (Int. j. hortic. agric. food sci.) https://aipublications.com/ijhaf/ Page | 31 Cool chamber with CoolBot 0.35 0.19 0.062 0.0039 SEm (±) 0.02 0.02 0.014 0.0011 F-value Ns Ns Ns Ns LSD0.05 - - - - Plastic packaging (Factor B) Control 0.19c 0.11 0.039b 0.0009b LDPE plastic with two holes 0.36ab 0.15 0.077ab 0.0041ab LDPE plastic with four holes 0.41a 0.15 0.040b 0.0012b LDPE plastic with six holes 0.30b 0.16 0.117a 0.0074a LDPE plastic with eight holes 0.31b 0.14 0.042b 0.0024b SEm (±) 0.03 0.026 0.018 0.0014 F-value ** Ns * * LSD0.05 0.09 - 0.054 0.004 CV, % 11.2 12.2 14.9 13.5 Grand mean 0.32 0.14 0.063 0.0032 Means with same letter in column are not significantly different at p = 0.05 by DMRT. Ns = Not Significant, ** significant at p < 0.01, ***significant at p < 0.001 and ns: not significantly different at p > 0.05. SEm± = Standard error of mean, LSD = Least significant difference, CV = Coefficient of variation and DOS = Days of storage 3.10 Citrus color index (CCI) Citrus color index (CCI) of mandarin differed significantly (p < 0.05) among the different storage conditions at 15 DOS and 45 DOS but it did not differ significantly at 30 DOS and 60 DOS (Table 11). The color values L, a, b showed a good correlation with the maturity stage of the tomato (Bui et al., 2010). In our study, greater value of citrus color index in LDPE plastic packaging with eight holes showed proper and uniform color development. It might be due to proper air circulation from the holes creates freshness of fruit with glossy appearance. Table 11. Effect of storage conditions and plastic packaging on citrus color index of mandarin in storage. Treatments Citrus color index (CCI) 15 DOS 30 DOS 45 DOS 60 DOS Storage conditions ( Factor A) Room storage 10.35b 11.93 12.69ab 11.28 Cellar storage 11.44a 12.00 12.14b 11.10 Cool chamber with CoolBot 11.46a 12.32 13.23a 11.56 SEm (±) 0.08 0.17 0.19 0.17 F-value *** Ns ** Ns LSD0.05 0.24 - 0.55 - Plastic packaging (Factor B) Control 9.78e 11.49b 11.94c 10.99 LDPE plastic with two holes 10.74d 11.51b 12.55bc 11.23
  • 13.
    Bhusal et al.International Journal of Horticulture, Agriculture and Food Science (IJHAF) 9(2)-2025 Article DOI: https://dx.doi.org/10.22161/ijhaf.9.2.3 (Int. j. hortic. agric. food sci.) https://aipublications.com/ijhaf/ Page | 32 LDPE plastic with four holes 11.34c 12.52a 12.68bc 11.43 LDPE plastic with six holes 11.69b 12.35a 12.77b 11.37 LDPE plastic with eight holes 12.04a 12.54a 13.51a 11.56 SEm (±) 0.10 0.22 0.24 0.22 F-value *** ** ** Ns LSD0.05 0.31 0.63 0.71 - CV, % 2.9 5.4 5.8 5.9 Grand mean 11.11 12.08 12.69 11.31 Means with same letter in column are not significantly different at p = 0.05 by DMRT. Ns = Not Significant, ** significant at p < 0.01, ***significant at p < 0.001 and ns: not significantly different at p > 0.05. SEm± = Standard error of mean, LSD = Least significant difference, CV = Coefficient of variation and DOS = Days of storage 3.11 Shelf Life The maximum shelf life was observed in case of LDPE plastic packaging with eight holes in cool chamber with CoolBot (91 days) and the minimum shelf life was observed in case of control in room storage (32 days). In a study on mandarin, maximum shelf life of 48 days was observed in case of GA3(100ppm) + perforated polyethene compared to control under room condition (Paudel et al., 2020). IV. CONCLUSION This study showed that the use of eight-hole polyethylene bags combined with CoolBot storage was effective in preserving the postharvest quality of mandarin fruits by minimizing physiological loss and maintaining nutritional content. The combination extended shelf life significantly compared to ambient conditions and non- ventilated packaging. Further research across multiple seasons and commercial storage settings is recommended to validate these findings. ETHICAL STATEMENT Not applicable as the study does not require any ethical approval. ACKNOWLEDGEMENTS The author would like to sincerely thank the staff of the Department of Horticulture, Agriculture, and Forestry University (AFU) and the National Citrus Research Program (NCRP) for providing assistance during the research. Special thanks to Scientist Sabitri Adhikari, NARC, for her guidance. The author is also grateful to my friends, juniors, and family for their constant encouragement. DISCLOSURE STATEMENT The authors have no relevant financial and non- financial interests to disclose. The authors declare that they have no competing interests. DATAAVAILABILITY The data supporting the findings of this study are available from the corresponding author upon reasonable request. FUNDING The authors declare that no funds, grants, or other support were received during the preparation of this manuscript. REFERENCES [1] Acharya, B., Joshi, B., Regmi, R., & Poudel, N. (2020). Effect of plant extracts and packaging materials on prolonging shelf life and maintaining quality of mandarin (Citrus reticulata Blanco.). International Journal of Horticulture, Agriculture and Food Science, 4(2), 29–34. https://doi.org/10.22161/ijhaf.4.2.3 [2] Adhikari, S. (2004). Postharvest Management of Fruit and Vegetables in the Asia-Pacific Region. Food and Agriculture Organization. [3] Adhikari, S. (2006). In Proceedings of postharvest management of fruit and vegetables in Asia-Pacific Region (p. 312). India: Asian Productivity Organization. [4] Ahmad, F., Zaidi, S., & Arshad, M. (2021). Postharvest quality assessment of apple during storage at ambient temperature. Heliyon, 7(8). doi:https://doi.org/10.1016/j.heliyon. 2021.e07714
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    Bhusal et al.International Journal of Horticulture, Agriculture and Food Science (IJHAF) 9(2)-2025 Article DOI: https://dx.doi.org/10.22161/ijhaf.9.2.3 (Int. j. hortic. agric. food sci.) https://aipublications.com/ijhaf/ Page | 33 Fig.1. Shelf life of mandarin under different storage conditions and plastic packaging 32 37 42 56 62 35 43 49 57 61 76 65 72 83 91 Room + Control Room + Plastic with two holes Room + Plastic with four holes Room + Plastic with six holes Room+ Plastic with eight holes Cellar + Control Cellar + Plastic with two holes Cellar + Plastic with four holes Cellar + Plastic with six holes Cellar + Plastic with eight holes Cool chamber with Coolbot + Control Cool chamber with Coolbot + Plastic with two holes Cool chamber with Coolbot + Plastic with four holes Cool chamber with Coolbot + Plastic with six holes Cool chamber with Coolbot + Plastic with eight holes Shelf life (days) Treatment combination Shelf life of mandarin
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