Poly (lactic acid)-based pH responsive membrane combined with chitosan and alizarin for food packaging
Poly (lactic acid)-based pH responsive membrane combined with chitosan and alizarin for food packaging
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用于食品包装的基于聚乳酸的 pH 响应膜与壳聚糖和茜素的组合
DOI：
10.1016/j.ijbiomac.2022.06.039
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发表时间：
2022
影响因子：
8.2
通讯作者：
Chuanhui Gao
中科院分区：
文献类型：
--
作者：
Yumin Wu;Ying Ma;Yiliang Gao;Yuetao Liu;Chuanhui Gao
采用溶液浇铸法制备了壳聚糖(CS)/茜素(AL)/聚乳酸(PLA)功能分区复合膜。聚乳酸/CA膜包括边缘部分的抗菌区(PLA/CS)和中心部分的pH响应检测区(PLA/AL)。同时加入环境友好增塑剂柠檬酸三丁酯(TBC)，使制备的聚乳酸/CA复合膜具有良好的柔韧性和较高的透明性。FE-SEM和FTIR分析结果表明，CS和AL在聚乳酸基质中分散均匀，与聚乳酸具有良好的相容性。聚乳酸/壳聚糖膜和聚乳酸/铝复合膜的抗氧化活性分别为43.3%和72.8%。同时，聚乳酸/壳聚糖膜对大肠杆菌和金黄色葡萄球菌的抑制率分别高达87.91%和75.17%。聚乳酸/铝薄膜具有优异的紫外线阻隔性能。当环境pH(氨气和醋酸蒸气)反复变化时，聚乳酸/铝膜在酸性条件下呈现可逆的黄色变化，在碱性条件下呈现可逆的紫色变化。在鸡胸肉的包装和贮藏过程中，可以通过功能性聚乳酸/CA复合膜的颜色变化来检测鸡胸肉的新鲜度。
A poly (lactic acid) (PLA) -based functional partition composite membrane (PLA/CA) containing chitosan (CS) and alizarin (AL) was designed by solution casting method. The PLA/CA membrane contains the antibacterial zone of the edge part (PLA/CS) and the pH response detection zone of the central part (PLA/AL). At the same time, the environmentally friendly plasticizer tributyl citrate (TBC) was added to make the prepared PLA/CA composite membrane have good flexibility and high transparency. The results of FE-SEM and FTIR showed that CS and AL were uniformly dispersed in PLA matrix and had good compatibility with PLA. The antioxidant activities of PLA/CS and PLA/AL composite films were 43.3 % and 72.8 %, respectively. At the same time, the inhibitory rates of PLA/CS membrane against Escherichia coli and Staphylococcus aureus were as high as 87.91 % and 75.17 %, respectively. PLA/AL films exhibit excellent UV barrier properties. When the environmental pH (ammonia and acetic acid vapor) changed repeatedly, the PLA/AL membrane showed reversible color change of yellow under acidic condition and purple under alkaline condition. During the packaging and storage of chicken breast meat, the freshness of chicken breast meat can be detected by the color change of functional PLA/CA composite membrane.