差示扫描量热法
化学
傅里叶变换红外光谱
花青素
葡萄籽提取物
银纳米粒子
食品包装
卡拉胶
食品科学
扫描电子显微镜
核化学
红卷心菜
抗菌剂
纳米颗粒
材料科学
化学工程
纳米技术
有机化学
复合材料
医学
物理
替代医学
病理
工程类
热力学
作者
Shuhan You,Xiaoyun Zhang,Yilin Wang,Yaobo Jin,Manman Wei,Xiudan Wang
标识
DOI:10.1016/j.ijbiomac.2022.06.206
摘要
Color indicator films for fish freshness were fabricated by incorporating κ-carrageenan (CAR) polymer with red grape skin extract (GSE) as a pH-sensing agent and silver nanoparticles (AgNPs) as an antimicrobial agent. Anthocyanins in GSE exhibited distinguished pH responsive color changes. GSE and AgNPs were well compatible with CAR with intramolecular interactions, approved by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) analysis, thermo-gravimetric analysis (TGA) and differential scanning calorimetry (DSC). GSE-containing films displayed distinguished color changes in response to pH variations and volatile ammonia. Enhanced UV blocking ability and strong antioxidant activity were revealed for GSE included films without sacrificing the physico-chemical properties of the CAR film. Films containing AgNPs showed improved mechanical strength and strong antimicrobial ability against both Escherichia coli and Staphylococcus aureus. The CAR/AgNPs/GSE film displayed a distinctive color change corresponding to changes in the total volatile basic nitrogen (TVB-N) of fish during storage. In addition, the CAR/AgNPs/GSE film showed excellent color stability to consecutive UV exposure and its storage time at 25 °C is expected to be at least 240 days, which indicates that it has high potential as an intelligent food freshness indicator film.
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