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Global Research journal of Natural Science  
& Technology (GRJNST)  
Volume: 04 - Issue 2 (2026), 2053  
ISSN P: 2790-7643 ISSN E: 2790-7651  
www.grjnst.net  
https://doi.org/10.53762/grjnst.04.02.05  
Postharvest Quality Preservation and Shelf-Life Extension of Apples  
Through Edible Coatings and Natural Preservative Treatments  
Received: 27 December 2025. Accepted: 26 January 2025. Published: 31 March 2026  
Anum Noureen  
Institute of Food and Nutritional sciences,  
Pir Mehr Ali shah Arid Agriculture University  
noureenanum46@gmail.com  
Zeeshan Ahmed  
Institute of Horticultural Sciences  
University of Agriculture Faisalabad  
Corresponding Author: zeesmile1999@gmail.com  
Muhammad Abbas Khan  
Department of Horticulture  
Balochistan Agriculture College Quetta  
muhammadabbaskhan1121@gmail.com  
Saeed Ahmad  
Lincoln Institute for Agri-food Technology  
University of Lincoln UK  
ahmadsaeeduol@gmail.com  
Ameer Jan  
Department of Botany  
University of Makran Panjgur  
GRJNST, Volume: 04 - Issue 2 (2026) / ISSN P: 2790-7643  
Article ID: 2053  
https://doi.org/10.53762/grjnst.04.02.05  
Copyright © 2026 GRJNST. This article is published under an Open Access model. It is made available to the public under the terms of the Creative  
Commons Attribution 4.0 International (CC BY 4.0) license, which permits unrestricted use and distribution  
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Abstract: Apples (Malus domestica), a leading temperate fruit crop valued  
for their nutritional and sensory qualities, experience substantial postharvest  
losses (8.6–50%) driven by rapid climacteric respiration, ethylene  
biosynthesis via the Yang cycle, transpiration-induced weight loss, enzymatic  
browning mediated by polyphenol oxidase (PPO), and microbial decay  
(primarily anthracnose and stem-end rot). Edible coatings formulated from  
polysaccharides (chitosan, starch, alginate, pectin), proteins (whey protein,  
zein), lipids (carnauba wax, beeswax), and composite blends create a semi-  
permeable barrier that modulates internal atmosphere, reduces O₂ availability  
and CO₂ accumulation, slows ethylene production and respiration, limits  
moisture loss, delays cell-wall degradation by polygalacturonase and pectin  
methylesterase, and inhibits enzymatic browning and pathogen growth.  
Incorporation of natural bioactive agents’ essential oils (cinnamon, oregano),  
nisin, lysozyme, ascorbic acid, and citric acid transform these coatings into  
active packaging systems with enhanced antimicrobial and antioxidant  
properties. Advanced application technologies, including electrostatic  
spraying, electrospraying, and nano-emulsions, improve uniformity, adhesion,  
and controlled release. Research demonstrates significant shelf-life extension  
(up to 21 days), retention of firmness, titratable acidity, ascorbic acid, total  
phenolics, and visual appeal, while reducing weight loss, browning index, and  
decay incidence. This review underscores edible coatings as a sustainable,  
consumer-friendly alternative to synthetic fungicides and plastic packaging,  
offering a practical solution to minimize postharvest waste, enhance market  
value, and support circular-economy principles in the global apple industry.  
Keywords: Apple postharvest, edible coatings, shelf-life extension, chitosan,  
starch, whey protein, essential oils, enzymatic browning, modified  
atmosphere, natural preservatives, firmness retention, sustainable packaging  
1. Introduction  
The global production of apples (Malus domestica) occupies a central role in the  
temperate fruit industry, driven by high consumer demand for their nutritional profile,  
which includes essential vitamins, dietary fibers, and polyphenolic antioxidants.  
However, the economic viability of apple production is perpetually challenged by  
significant postharvest losses that occur between the orchard and the final consumer  
(Singh et al., 2025). These losses are not merely quantitative but also qualitative,  
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involving the deterioration of texture, flavor, and aesthetic appeal (Alam et al., 2024).  
Within the current global food system, it is estimated that approximately one-third of  
all food produced is lost or wasted, with fruits and vegetables experiencing even higher  
rates of 45% to 55%, translating to 1.2 to 2 billion tons of wasted biomass annually  
(Porat et al., 2018). Postharvest losses of apples occur at multiple stages of the supply  
chain, from harvesting to household consumption. The major points of quality  
deterioration and loss distribution are illustrated in figure 1.  
Figure 1: Apple Postharvest Supply Chain and Loss Points  
In the specific context of apples, losses are distributed across the supply chain. In the  
United States, retail-level losses are estimated at 8.6%, while consumer-level waste can  
reach 20% (Buzby et al., 2011). In developing nations, the lack of robust cold chain  
infrastructure and modern storage technologies results in postharvest losses ranging from  
20% to 50% (Kaur & Watson, 2024). These figures underscore a profound inefficiency  
in the use of land, water, and energy resources. Reducing these losses, often termed the  
"hidden harvest," is essential for global food security and aligns with the circular  
economy approach by minimizing agricultural waste through the use of protective edible  
coatings and natural bioactive substances (Minor et al., 2020).  
Table 1: Estimated Postharvest Loss Percentages of Apples and Global Produce  
Region/Category  
Estimated  
Loss Key Drivers of Loss  
Percentage (%)  
Global  
Fruits  
and 45 - 55  
Handling, lack of cold chain,  
Vegetables  
spoilage  
Developing Nations  
20 - 50  
Storage infrastructure, transit  
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delays  
US Retail (Apples)  
8.6  
Over-ripening,  
rejection  
aesthetic  
US Consumer (Apples)  
20.0  
Domestic storage conditions,  
senescence  
Post-CA  
Storage 3.9 - 12.1  
Fungal  
decay,  
physiological  
(Gala/Fuji)  
disorders  
2. Physiological and Biochemical Mechanisms of Senescence  
Apples are climacteric fruits, meaning their ripening is marked by a distinctive surge in  
respiration and the autocatalytic production of ethylene (C2H4). This physiological  
burst triggers a cascade of biochemical modifications that gradually transition the fruit  
from its peak maturity into senescence (Anwar et al., 2018). The primary factors  
contributing to this decline include transpiration-induced water loss, the depletion of  
internal energy reserves via respiration, and the enzymatic degradation of cell wall  
structures (Ali et al., 2025).  
2.1 Respiration, Ethylene Biosynthesis, and the Yang Cycle  
The metabolic activity of harvested apples is driven by respiration, where sugars and  
organic acids are oxidized to produce energy, CO2, and water. High respiration rates  
lead to a rapid depletion of these substrates, resulting in flavor loss and the softening of  
the fruit (Brizzolara et al., 2020). Ethylene acts as the primary orchestrator of these  
changes, regulating the expression of genes involved in softening, color transformation,  
and volatile production (Thewes et al., 2019).  
Ethylene biosynthesis follows the Yang cycle, starting with L-methionine, which is  
converted to S-adenosyl-L-methionine (SAM). Two critical enzymes then regulate the  
production of ethylene: 1-aminocyclopropane-1-carboxylate synthase (ACS) and 1-  
aminocyclopropane-1-carboxylate oxidase (ACO) (Yip et al., 1996). ACS catalyzes the  
conversion of SAM to 1-aminocyclopropane-1-carboxylic acid (ACC), which is  
generally considered the rate-limiting step, although ACO has been identified as a  
secondary limiting factor under specific developmental conditions (Boeckx et al., 2019).  
Edible coatings (ECs) extend shelf life primarily by creating a modified atmosphere  
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around the fruit, which lowers internal O2 levels and elevates CO2. Because ACO  
requires O2 for its activity, this modified atmosphere directly inhibits the final step of  
ethylene production, thereby delaying the climacteric peak and slowing down the  
maturation process (Büchele et al., 2023).  
2.2 Moisture Loss and Transpiration Kinetics  
Apples possess a high moisture content, typically between 75% and 95%. Postharvest  
weight loss is predominantly a consequence of transpiration, where water vapor migrates  
from the fruit's internal tissues to the surrounding environment through lenticels, the  
cuticle, or mechanical injuries (Hassan et al., 2025). A weight loss of as little as 3% to  
5% can result in visible shriveling and a loss of crispness, significantly reducing market  
value (Lufu et al., 2024). Edible coatings serve as a physical barrier that blocks these  
pathways, significantly reducing the vapor pressure deficit and maintaining tissue turgor  
(Umeohia et al., 2024).  
2.3 Enzymatic Browning and Structural Degradation  
In fresh-cut apple products, enzymatic browning is the most significant deterrent to  
consumer acceptance. Slicing ruptures cellular membranes, allowing polyphenol oxidase  
(PPO) to interact with phenolic substrates and O2, forming brown-colored melanins  
(Fan, 2023). Simultaneously, the loss of firmness is driven by the breakdown of  
insoluble protopectin into soluble pectin by enzymes like polygalacturonase (Tarawneh  
et al., 2025). These biochemical changes not only diminish the sensory quality of the  
apple but also create an environment conducive to microbial growth (Arnold et al.,  
2023).  
3. Edible Coating Matrices: Composition and Structural Properties  
Edible coatings are formulated from a variety of biopolymers, including polysaccharides,  
proteins, lipids, and composite blends (Dhumal et al., 2018).  
3.1 Polysaccharide-Based Biopolymers  
Polysaccharides are the most widely explored materials for apple preservation due to  
their abundance, low cost, and excellent gas barrier properties (Pillai et al., 2024).  
• Chitosan: A cationic polymer derived from the deacetylation of chitin, chitosan is  
prized for its intrinsic antimicrobial and antifungal properties (Ali et al., 2025).  
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It forms a semipermeable film that effectively regulates gas exchange (O2 and  
CO2), thereby reducing the respiration rate (Zhao et al., 2021).  
• Starch derivatives: Sago, potato, and corn starches are frequently utilized. Sago  
starch exhibits superior film-forming properties compared to low-amylose  
starches. Research has demonstrated that a blend of 5% sago starch and 0.5%  
soy oil can maintain the quality of fresh-cut apples for 12 days at 4 degrees C  
(Srivastav et al., 2025). Potato starch has been identified as exceptionally  
effective for color retention, achieving a significantly lower browning index  
compared to other polysaccharide bases (Shoukat et al., 2025).  
• Alginate and Pectin: These hydrophilic polymers are often used for fresh-cut  
produce. Sodium alginate requires cross-linking with divalent cations like calcium  
(Ca2+) to form a stable, water-insoluble gel (Wang et al., 2025). This cross-  
linking not only improves the structural integrity of the coating but also provides  
supplemental calcium to the fruit tissue, which reinforces the cell wall and  
maintains firmness (Sharma et al., 2025).  
3.2 Protein-Based Biopolymers  
Proteins offer excellent gas barrier properties under low relative humidity and possess  
higher nutritional value than polysaccharides (Wang & Rhim, 2025).  
• Whey Protein: A byproduct of the dairy industry, whey protein isolate (WPI)  
forms transparent, odorless coatings with high barrier efficacy. Research on  
Golden Delicious apples indicates that WPI coatings can reduce weight loss from  
6.8% to 5.75% and delay the conversion of starch to sugars (Tarawneh et al.,  
2025).  
• Zein: This corn-derived protein is unique due to its hydrophobic nature, making  
it a more effective moisture barrier than most other proteins. Coatings  
comprising zein and nisin have successfully extended the shelf life of Granny  
Smith apples to 21 days at 15 degrees C (Ali et al., 2023).  
3.3 Lipid-Based Biopolymers  
Lipids, including beeswax, carnauba wax, and shellac, are primarily used to combat  
moisture loss. While they provide superior moisture retention and a desirable surface  
gloss, they are often less effective as gas barriers and can be brittle if used alone  
(Shellhammer & Krochta, 2018). Modern approaches involve emulsifying these lipids  
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into polysaccharide matrices to create composite coatings that leverage the strengths of  
both material types (Kumari et al., 2026).  
Table 2: Comparison of Major Biopolymer Categories for Apple Coatings  
Biopolymer  
Category  
Representative  
Materials  
Primary Advantage  
Limitation  
Polysaccharides  
Proteins  
Chitosan, Alginate, Superior gas barrier High water vapor  
Sago Starch (O2, CO2) permeability  
Whey Protein, Zein, Excellent  
aroma Fragile;  
humidity  
Soy Isolate  
barrier; nutritional  
sensitive  
Lipids  
Beeswax, Carnauba, Superior  
moisture Brittle; may cause  
anaerobic stress  
Shellac  
barrier  
Composites  
Starch-Lipid,  
Protein-Lipid  
Balanced  
gas/moisture barrier  
Complex  
formulation process  
4. Natural Preservative Treatments and Active Ingredients  
The functionalization of edible coatings through the incorporation of natural bioactive  
substances represents the vanguard of active packaging (Trajkovska Petkoska, et al.,  
2021). The incorporation of natural bioactive compounds converts edible coatings into  
active packaging systems with antimicrobial properties. The major antimicrobial  
mechanisms of these natural preservatives are illustrated in figure 2.  
4.1 Essential Oils (EOs) and Plant Extracts  
Essential oils from plants such as oregano and cinnamon leaf are rich in volatile  
compounds like carvacrol and cinnamaldehyde. These compounds exhibit potent  
antimicrobial activity by disrupting the cytoplasmic membranes of bacteria and fungi  
(Ali et al., 2025). For Braeburn apples, a chitosan coating infused with 0.1% cinnamon  
leaf EO was found to be the most effective formulation for maintaining quality and  
inhibiting microbial growth (Ali et al., 2025).  
4.2 Bacteriocins and Biopreservative Enzymes  
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• Nisin: A polycyclic antimicrobial peptide produced by Lactococcus lactis, nisin is  
an FDA-approved bio-preservative (Cava-Roda et al., 2021). It functions by  
forming pores in the cell membranes of Gram-positive bacteria. In Granny Smith  
apples, zein coatings incorporated with nisin achieved significant reductions in  
microbial counts (Brandes et al., 2024).  
• Lysozyme and Lactoperoxidase: These enzymes are increasingly used in active  
coatings due to their strong antimicrobial properties. These enzymes are safe,  
stable, and highly compatible with biopolymer matrices like alginate and whey  
protein (Yousefi et al., 2022).  
4.3 Antioxidants and Anti-browning Agents  
To address enzymatic browning, coatings are frequently enriched with organic acids  
such as ascorbic acid and citric acid. These compounds act by lowering the surface pH  
or by reducing quinones produced by PPO back into phenols (AL-abbasy et al., 2021).  
Research has shown that 1% ascorbic acid, synergized with potato starch and calcium  
chloride, can maintain the visual appearance and firmness of apple slices for 15 days  
(Moon et al., 2020).  
Figure 2: Antimicrobial Mechanisms of Natural Preservatives  
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5. Innovative Application Technologies  
The efficiency of an edible coating is determined by its composition and the method of  
application, which influences film thickness and uniformity (Kocira et al., 2021).  
5.1 Traditional Dipping and Spraying  
The dipping method involves immersing the apple in the coating solution for 5 to 30  
seconds. While simple and effective for irregular surfaces, it often leads to excessive  
material consumption and can result in thick coatings that may induce anaerobic  
respiration (Singh et al., 2025).  
5.2 Electrostatic Spray Coating (ESC) and Electrospraying  
ESC is a technology where coating droplets are given an electrical charge, causing them  
to be attracted to the grounded fruit surface. This results in a highly uniform layer with  
minimal material waste. Electrospraying, a related technique, utilizes an electric field to  
generate a stable "cone-jet" geometry, allowing for precise control over film thickness at  
the nano-scale (Cakmak et al., 2018).  
5.3 Nano-emulsions and Nano-coatings  
The integration of nanotechnology involves dispersing hydrophobic active ingredients as  
droplets with diameters between 10 and 100 nm. Nano-emulsions, such as those  
formulated with beeswax and lecithin, offer enhanced stability and improved  
transparency compared to macro-emulsions. These systems have demonstrated  
impressive results in reducing physiological weight loss and spoilage rates of apples over  
15 days of storage (Hassan et al., 2025).  
Table 3: Comparison of Traditional vs. Innovative Application Techniques  
Application  
Technique  
Uniformity Material  
Waste  
Equipment  
Complexity  
Target Application  
Dipping  
Moderate  
Low  
High  
Low  
Fresh-cut slices; lab  
use  
Conventional  
Spray  
Moderate  
Moderate  
High  
Large-scale  
fruit  
whole  
Electrostatic Spray Very High Very Low  
High-value  
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cultivars; industrial  
Electrospraying  
Excellent  
Very Low  
Very High  
Nano-active  
coatings; research  
6. Impact on Critical Quality Attributes  
The ultimate success of edible coatings is measured by their ability to maintain the  
physicochemical and sensory integrity of the apple (Anwar et al., 2018).  
6.1 Preservation of Firmness and Texture  
The loss of firmness is a primary cause of consumer rejection. In zein-coated Granny  
Smith apples, the application of the coating significantly delayed weight loss and  
maintained texture for 21 days.. In fresh-cut slices, alginate-based coatings containing  
dietary fibers from apple pomace have been shown to double or even triple firmness  
compared to controls (Boeckx et al., 2019).  
6.2 Maintenance of Titratable Acidity and Total Soluble Solids  
As apples ripen, titratable acidity (TA) generally declines while total soluble solids  
(TSS) increase due to starch hydrolysis (Umeohia et al., 2024). Edible coatings  
effectively slow down these metabolic transitions. For example, whey protein coatings  
applied to Golden Delicious apples maintained significantly higher TA and lower TSS  
levels over storage compared to uncoated samples (Tarawneh et al., 2025).  
6.3 Color Stability and Aesthetic Appeal  
Edible coatings prevent browning in cut apples by limiting O2 access to PPO (Boeckx et  
al., 2019). Colorimetric analysis using the CIELAB space (L*, a*, b*) is the standard for  
quantifying these changes. Research on starch-based coatings demonstrated that potato  
starch was the most effective ingredient for maintaining the L* value (lightness) and  
preventing the shift toward positive a* values (redness/browning) (Dhumal et al.,  
2018).  
7. Consumer Acceptance and Market Integration  
Retail trends and consumer psychology heavily influence the adoption of edible coatings  
in the commercial sector (Lufu et al., 2024).  
7.1 Food Technology Neophobia (FTN) and Educational Interventions  
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Recent trends have seen major retailers remove edible food coatings from apples in  
response to consumer demands for "natural" products. This highlights a challenge  
known as Food Technology Neophobia (FTN), where consumers reject novel food  
technologies due to a lack of understanding (Bucher et al., 2023). However, research has  
shown that providing information regarding the coatings purpose specifically its role in  
reducing food waste significantly increases acceptance rates (Spadoni et al., 2021).  
8. Conclusion  
Edible coatings and integrated natural preservative treatments represent a highly  
effective, biodegradable, and consumer-preferred strategy to combat the substantial  
postharvest losses that continue to undermine the economic and nutritional value of  
apples worldwide. By establishing a tailored semi-permeable barrier and delivering  
bioactive compounds directly at the fruit surface, these technologies successfully slow  
climacteric respiration and ethylene production, reduce transpiration and weight loss,  
inhibit enzymatic browning, delay cell-wall softening, and suppress microbial decay  
without reliance on synthetic chemicals. Extensive evidence demonstrates consistent  
improvements in key quality parameters firmness, titratable acidity, ascorbic acid  
content, color stability, and sensory appeal while extending marketable shelf life under  
both ambient and refrigerated conditions. As global pressure mounts to reduce food  
waste, plastic packaging, and chemical residues, edible coatings offer a scalable,  
sustainable solution aligned with circular-economy principles and evolving consumer  
demand for clean-label products. Continued research focusing on multi-functional smart  
coatings, industrial-scale application technologies, regulatory harmonization of  
nanomaterials, and consumer education will accelerate commercial adoption. Ultimately,  
widespread implementation of these innovative postharvest technologies will enhance  
supply-chain efficiency, increase farmer profitability, improve global food security, and  
contribute meaningfully to the reduction of agricultural waste in the apple industry.  
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