The effect of polyvinyl alcohol/chitosan-based active composite coating containing Zataria multiflora Boiss. extract on internal quality and eggshell during storage
Subject Areas : PackEsmaeil Yousefi Zirabi 1 , ِِdariush khademi shurmasti 2
1 - Department of Agriculture, Savadkooh Branch, Islamic Azad university, Savadkooh, Iran
2 - Department of Agriculture, savadkooh Branch, Islamic Azad University, Savadkoo, Iran
Keywords: Thyme (Zataria multiflora Boiss), Egg, Shelf life, montmorillonite, nanocomposite,
Abstract :
Introduction: Eggs are one of the low-cost sources of protein with balanced nutritional quality and at the same time they are perishable. Maintaining its quality during the storage period is a challenge that needs to be overcome by using technologies that guarantee the product's safety. The present research was carried out to prepare, describe and evaluate the effectiveness of multi-component nano-coating on the physicochemical and microbial changes of eggs during the storage period of 4 weeks. Materials and methods: internal and shell quality indicators of uncoated eggs (control) and eggs treated with two-component polyvinyl alcohol/chitosan (PC) coating, three-component Polyvinyl alcohol/chitosan/montmorillonite (PCM), and PCM films containing concentrations of 2% and 4% of thyme extract were evaluated in a total of 5 treatments and 3 replicates in a completely randomized design. Results: Thyme extract at a concentration of 4% had a strong antimicrobial effect against Staphylococcus aureus and moderate to strong against Escherichia coli. Three-component active PCM films had higher thickness, tensile strength, elasticity modulus, opacity, lower strain, and permeability (p<0.05). At the end of 4 weeks of storage, the eggs coated with three-component active PCM, had thicker (0.400 mm), stronger (3.100 kg) eggshells, less weight loss (about 4 %), higher haugh unit (70.00) and yolk index (0.43) and less the total viable count (log cfu/ml 4.00). Conclusion: Therefore, it is possible to use PCM three-component nanofilm and coating containing 4% of thyme extract as a biodegradable packaging of food products including eggs to maintain the quality and extend its storage time in ambient temperature used.
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