Bioactive Film Based on Polyvinyl Alcohol/Starch Enriched with Antioxidants from Extracted Spent Coffee Ground and Citric Acid
In this study, properties of bioactive starch powder/ polyvinyl alcohol film incorporated extracted spent coffee ground (St/PVA) and various content of citric acid were investigated. All samples were exposed to humidity at 32, 43, 52 and 75% for 7 days before testing of their properties. The addition of citric acid substantially decreased isotherm of moisture sorption as well as improved water resistant. The moisture content and total solubility index decrease up to 8.11-8.81% and 20.60-25.06%, respectively. The St/PVA incorporated with 10 wt% of citric acid showed the highest glass transition temperature and melting temperature due to the good compatibility of polymer matrix. The inhibition of microbial by incubation with fresh apple for 7 days indicated the number of microbial of St/PVA incorporated 30 wt% citric acid showed the lowest value at 10 CFU/g which was lower than those of St/PVA and commercial packaging. Based on these results, the St/PVA incorporated citric had high potential for utilize as bioactive and biodegradable food packaging to control food quality and extent shelf life.
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