Abstract
The current work explores the potential use of commercial Chinese bayberry tannin (BT) to develop antioxidant PVA-based films using solvent casting process for packaging applications. The effect of BT concentration on opacity, water resistance and antioxidant capacity of resulting films was investigated. Properties like tensile strength, thermal behavior, and morphological aspects were also characterized. The experimental results showed that PVA/BT films formed with uniformly brown color and generally good transparency, offering good antioxidant ability. The PVA film containing BT presented slightly higher water resistance according to the results of moisture content and water vapor permeability, especially at low BT content (
Highlights
Conventional packaging made from fossil resources has been widely used in various applications, the over-consumption of such nondegradable and non-recyclable packaging has caused serious environmental problems
The DPPH free radical scavenging assays showed that PVA/bayberry tannin (BT) films can present good antioxidant ability
The PVA films containing BT acquired relatively good water resistance according to moisture content and water vapor permeability, especially at low BT content, which reveals the hydrophobicity of BT and the potential use of these materials for packaging applications
Summary
Conventional packaging made from fossil resources has been widely used in various applications, the over-consumption of such nondegradable and non-recyclable packaging has caused serious environmental problems. The main trend for packaging innovations is the development of active packaging having antioxidant, anti-UV, and antimicrobial activities, especially for food and biomedical applications for the purpose of effective protection of manufactured products from deterioration during transportation, storage and display steps [3,4]. The incorporation of PVA with natural active ingredients, such as chitosan [4,5,6], essential oils [7], tomato by-products extract [8], and lignin [9,10], were frequently reported recently for developing PVA-based films containing antioxidant and/or antimicrobial functions. Compared with synthetic active agents, the use of natural active ingredients limited the risk of potential toxicity by migration especially in the field of food packaging and biomedical applications
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