Abstract
The interest in the development of edible and biodegradable films has increased because it is every day more evident that non-degradable materials are doing much damage to the environment. Blends based on different ratios of plasticized poly(vinyl alcohol) (PVA), carboxymethyl cellulose (CMC) and Tannin compound were prepared by solution casting in the form of thin films. Then the blend films were exposed to different doses of gamma radiation. First, the effect of gamma irradiation and the Tannin compound, as an antimicrobial agent, on the thermal and mechanical properties was investigated. As an application in the field of the prolongation of food preservation lifetime, banana fruits were coated with solutions of gamma irradiated PVA/CMC blends in the presence of Tannin. The results showed that the gamma irradiation improved the thermal properties, which provides suitable materials based on natural biodegradable polymers for food preservation withstanding the temperature and stresses.
Highlights
The increasing demand for fresh fruits and vegetables forces the food industry to develop new and better methods for maintaining food quality and extending shelf life
We have proposed to study the possibility to obtain blend materials starting from poly(vinyl alcohol) (PVA) and carboxymethyl cellulose (CMC) in order to improve the physico-chemical properties of the blends
Dynamic mechanical properties of PVA, CMC and PVA/CMC at different ratio before and after irradiation were studied and it was found that storage and loss modulus for CMC was higher than that for PVA, these properties decreased with irradiation
Summary
The increasing demand for fresh fruits and vegetables forces the food industry to develop new and better methods for maintaining food quality and extending shelf life. There is increasing public interest in development of edible natural biodegradable coatings to replace the currently used commercial synthetic waxes for maintaining postharvest quality of fruit. In this regard, developed polysaccharide-based edible bilayer coating comprises carboxymethyl cellulose (CMC) and chitosan in preserving postharvest quality of various citrus fruit, including “Or” and “Mor” mandarins, “Navel” oranges, and “Star Ruby” grapefruit after simulated storage and marketing have been studied [3]. The effect of Tannin and different irradiation doses on the structure and properties of PVA/CMC/Tannin composite films were investigated These blends may eventually used in film industry as edible packaging material for food preservation. The films were removed from the dishes and placed in sealed containers at 4 ̊C to avoid moisture exchange
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