壳聚糖
活性包装
接触角
食品包装
极限抗拉强度
材料科学
化学工程
热稳定性
微观结构
肿胀 的
没食子酸表没食子酸酯
抗氧化剂
溶解度
化学
傅里叶变换红外光谱
核化学
食品科学
复合材料
多酚
有机化学
工程类
作者
Wangli Dai,Lin Zhou,Shi Gu,Wenjie Wang,Zheng Xu,Xuxia Zhou,Yuting Ding
标识
DOI:10.1016/j.ijbiomac.2022.04.226
摘要
Novel chitosan films incorporating epigallocatechin gallate (EGCG) were prepared and demonstrated the ideal physical and mechanical properties required of candidate food packaging materials alongside desirable antioxidant and antibacterial activity. Compared with traditional chitosan films, chitosan films incorporated with EGCG were thicker, had higher tensile strength and water solubility, and had lower elongation at break, moisture content, degree of swelling, and water contact angles. Although EGCG-containing films were slightly darker in color than pure chitosan films, they exhibited a greater inhibitory effect on light-induced oxidation with obviously improved UV-vis barrier capability and opacity. Scanning electron microscopy results suggested that EGCG-incorporated samples had a rougher surface structure. This was further confirmed by atomic force microscopy and indicated that the addition of EGCG facilitated the formation of protective barriers through the interaction between the film and food surface. FTIR spectroscopy confirmed that EGCG interacted with chitosan by intermolecular hydrogen bonding and effectively improved the thermal stability of chitosan films. Notably, the incorporation of EGCG significantly enhanced the antioxidant and antibacterial activity of chitosan films. Hence, chitosan films incorporating EGCG have potential applications in the food industry as a novel active packaging material, especially in preventing food oxidation and spoilage in perishable foods.
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