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. 2023 May 7;11(9):5041-5049.
doi: 10.1002/fsn3.3394. eCollection 2023 Sep.

Egg shelf life can be extended using varied proportions of polyvinyl alcohol/chitosan composite coatings

Dariush Khademi Shurmasti  1 , Pezhman Riazi Kermani  1 , Maryam Sarvarian  1 , Chinaza Godswill Awuchi  2
Affiliations

Egg shelf life can be extended using varied proportions of polyvinyl alcohol/chitosan composite coatings

Dariush Khademi Shurmasti et al. Food Sci Nutr. .

Abstract

Using biopolymers in the form of edible coating as egg eco-friendly packaging is a progressive approach. The blending of biopolymers is one of the procedures for overcoming mechanical weakness and benefiting from their maximum synergistic effect. Aiming to determine the relative ratios of chitosan (CH 4 w/v%) and polyvinyl alcohol (PVA 5 w/v%) in the composition of blended coatings, an experiment was conducted with six treatments (r = 3) including different ratios of CH/PVA (0:0; control, 100:0, 75:25, 50:50, 25:75, and 0:100) wt% in a period of 4 weeks of egg storage at ambient temperature, emphasizing eggshell barrier properties. Based on the eggshell analysis result, SEM images and FTIR spectra demonstrated that the components were firmly integrated into the blended coatings as well as had more intertwined than their pure ones, which was also reflected in the evaluation results of their internal quality parameters. In addition, the results showed that by enhancing the ratio of polyvinyl alcohol from 25 to 75 wt%, the blended coating barrier efficiency was relatively improved (p < .05). Meanwhile, the lowest percentage of weight loss (0.57 ± 0.08%), pH value of albumin (8.30 ± 0.04), the highest values of Haugh unit (61.00 ± 0.07), yolk index (0.37 ± 0.02) were observed in eggs coated with CH/PVA 25:75 wt%. But there was no difference in 50 or 70 wt% PVA significantly. Therefore, the CH/PVA blended coatings containing around 50-75 wt% PVA, as egg biodegradable packaging, can be used to extend the shelf life for 2-3 weeks at ambient temperature.

Keywords: biodegradable; blended coating; egg internal quality; eggshell morphology.

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Conflict of interest statement

The authors declare that they have no conflict of interest.

Figures

FIGURE 1
FIGURE 1
Effects of experimental treatments on weight loss (%) during 4‐week storage. A‐D indicates the significant difference of each treatment during 4‐week storage, a‐d indicates the significant difference of the treatments in each time period storage.
FIGURE 2
FIGURE 2
Scanning electron microscopy (SEM) images of eggshell's outer surface at days 0 and 28 (Scale bar = 50 μm). Arrows show some micro‐pits, wrinkles, and discontinuity in images.
FIGURE 3
FIGURE 3
Fourier transform infrared (FTIR) spectra of eggshell surface coatings (CH, PVA, and blends of CH/PVA) at day 28.
See this image and copyright information in PMC

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