Abstract
This work aims at developing a novel multifunctional and edible film through incorporating nano zinc oxide to phenyllactic acid grafted chitosan (ZnO/PLA-g-CS) film. The resulting film exhibited improved mechanical properties (tensile strength and elongation-at-break) than chitosan film (P < 0.05). The protecting effect of the biodegradable film on Taiwan green jujube during storage was investigated. After 21 days of storage, the weight loss, and rotting rate of the fruits treated with ZnO/PLA-g-CS film were significantly reduced (P < 0.05). In addition, ZnO/PLA-g-CS film caused a higher (P < 0.05) retention of ascorbic acid, total phenol, total soluble solids and malondialdehyde content in fruits. 44.73% and 63.28% of omethoate pesticide and chlorpyrifos pesticide degraded after 72 h treatment of ZnO/PLA-g-CS in aqueous solution, which were 38.05% and 32.71% higher than those of the control, respectively. Furthermore, the film showed good catalytical capacity to the hydrolysis of both omethoate and chlorpyrifos. These results suggested that ZnO/PLA-g-CS film could effectively retard postharvest loss of fruits and can potentially be used as a multifunctional preservative that improves the quality and safety of fruits during storage.
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