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Sustained antimicrobial polymer film from γ-CD-MOF humidity switch for fruit and vegetable preservation
Wangfei Yu1, Guannan Wang1, Huizhi Chen1
1Zhejiang Key Laboratory of Intelligent Food Logistic and Processing, Key laboratory of post-harvest handling of fruits, Ministry of Agriculture and Rural Affairs, Key Laboratory of Postharvest Preservation and Processing of Vegetables (Co-construction by Ministry and Province), Key laboratory of postharvest preservation and processing of fruits and vegetables, China National Light Industry, Food Science Institute, Zhejiang Academy of Agricultural Sciences, China.
Abstract:
To address the poor hydrolytic stability of CD-MOF in food applications, CD-MOF loaded with thymol (TCDM) was prepared and filled into a pectin (PEC)/sodium alginate (SA) substrate with the aid of zein to obtain a thymol-CD-MOF/zein-PEC-SA (TCDM/ZPS) polymer film. Characterization revealed that zein-PEC/SA (ZPS) protected TCDM by forming amphiphilic microspheres. TCDM was able to exist stably in the hydrophilic polysaccharide substrate and achieve a long-term slow release over 336 h. Besides, environmental humidity could also be used as a switch for regulating the thymol release rate, which was consistent with the first-order release model (R2 > 0.99). TCDM and TCDM/ZPS showed excellent antimicrobial effects against E. coli, S. aureus, and B. cinerea, the most common fungi in plant-based foods. The preservation experiment maintained the quality of strawberry and Agaricus bisporus mushroom. This strategy holds the potential to broaden the application scope and enhance the utility of CD-MOF in food preservation.
