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°, 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.

这项研究设计了一种新型指示剂，其疏水性聚偏二氟乙烯（PVDF）膜作为防潮层。并且基于聚乙烯醇/海藻酸钠（PS）和玫瑰茄花色苷（RAs）提供传感器层。已经研究了双层指示剂的物理性质，微观结构和颜色稳定性。PS / RAs / PVDF膜（PSRF）的水接触角（WCA）为108.85°，可以认为是出色的疏水性表面。PSRF的最低水蒸气透过率（WVP）值表现出良好的防潮性能。因此，使用PSRF膜来监测griskin的新鲜度。72小时时，总挥发性碱性氮（TVB-N）水平增加至18.02 mg / 100 g，指示剂的颜色呈现可见的颜色变化。获得的结果表明TVB-N之间有很好的相关性，指示剂的pH值和颜色变化。研究表明，PSRF指标在食品智能包装中的应用潜力越来越大。