Development of moisture-absorbing and antioxidant active packaging film based on poly(vinyl alcohol) incorporated with green tea extract and its effect on the quality of dried eel

摘要

Active packaging film with functions of moisture-absorbing and antioxidant activity was developedrnbased on poly(vinyl alcohol) (PVA) incorporated with green tea extract (GTE). The effects of GTErnconcentrations of 0, 0.5, 1, 1.5, and 2% on the physical, structural, and antioxidant properties ofrnPVA films were investigated. The PVA film containing 2% GTE had lower moisture absorbing efficiencyrnrelatively and better antioxidant activity through DPPH radical-scavenging abilityrnexperiment. A packaging system of GTE-incorporated PVA films was applied to package dried eelrnand quality of dried eel was evaluated during storage. The result showed that dried eel packedrnwith GTE-incorporated PVA films showed lower weight change, peroxide value and TBARS valuernduring storage than that packed without PVA films or with PVA films but no GTE. The PVA filmrncontaining 2% GTE showed the best quality protective effectiveness to prevent the dried eel fromrnabsorbing moisture and oxidizing of lipid.