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    A visual bi-layer indicator based on roselle anthocyanins with high hydrophobic property for monitoring griskin freshness

    Year: 2021

    Journal: Food Chem., Volume 355, SEP 1

    Authors: Zhang, Junjun; Huang, Xiaowei; Shi, Jiyong; Liu, Li; Zhang, Xinai; Zou, Xiaobo; Xiao, Jianbo; Zhai, Xiaodong; Zhang, Di; Li, Yanxiao; Shen, Tingting

    Organizations: Science Foundation for Distinguished Young Scholars of Jiangsu Province [BK20200103]; National Natural Science Foundation of China [31671844]; Graduate Student Innovation Training Project of Jiangsu Province [KYCX20_3046]; National Key research and Development Program of China [2018YFD 0400800]; Natural Science Foundation of Jiangsu province, China [BK20180865]; Project of Faculty of Agricultural Equipment of Jiangsu University

    Keywords: PVDF film; Hydrophobic property; Bi-layer indicator; WCA; WVP; Freshness

    This study designed a new type indicator with hydrophobic Polyvinylidene Fluoride (PVDF) film as a moisture prevent-layer. And the sensor layer was provided based on polyvinyl alcohol/Sodium alginate (PS) and Roselle anthocyanins (RAs). Physical properties, microstructure, and color stability of the bi-layer indicator have been investigated. The Water contact angle (WCA) of PS/RAs/ PVDF film (PSRF) was 108.85 degrees, which can be considered as an excellent hydrophobic surface. The lowest Water Vapor Permeability (WVP) value of PSRF exhibited a good barrier property for moisture. Therefore, PSRF film was used to monitor the griskin freshness. The Total volatile basic nitrogen (TVB-N) level was increased to 18.02 mg/100 g at 72 h, and the color of the indicator presented visible color changes. The acquired results revealed a good correlation between TVB-N, pH and color change of the indicator. The research indicated that PSRF indicator has increasing potential application on food intelligent packaging.
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