Preparation of PVA/Tremella polysaccharide and soy protein isolate complex/ε-polylysine active membrane and its application in blueberry preservation

Abstract

This study aimed to investigate the physicochemical properties, antioxidant and antibacterial activities of Tremella polysaccharides combined with soybean protein isolate (TFP-SPI), natural antibacterial agent ε-polylysine (PL) and polyvinyl alcohol (PVA) hybrid membrane and its applicability in the blueberry preservation. In this study, TFP-SPI was successfully prepared, and it was mixed with PL and PVA to prepare nanofiber membranes. FTIR results showed that TFP-SPI had hydrogen bond interaction. The physicochemical properties showed that the incorporation of TFP-SPI improved the hydrophilicity and mechanical properties of the membrane, providing the best water vapor barrier performance. In vitro antioxidant experiments showed that PVA/TFP-SPI/PL membranes possessed antioxidant capacity. In vitro antibacterial experiments showed that PVA/TFP-SPI/PL membranes had antibacterial activity, especially against Staphylococcus aureus. The results of fruit preservation showed that PVA/TFP-SPI/PL membrane could effectively extend the shelf life of blueberries and maintain good quality. Therefore, PVA/TFP-SPI/PL membrane is a potential active packaging material with promising application prospects.