基于壳聚糖和蝴蝶布丁提取物的 pH 指示剂薄膜，用于监测鱼类新鲜度。
A pH indicator film based on chitosan and butterfly pudding extract for monitoring fish freshness.
机构信息
Institute of Agriculture and Food Engineering, Kunming University of Science and Technology, Kunming 650550, China.
Institute of Agriculture and Food Engineering, Kunming University of Science and Technology, Kunming 650550, China.
出版信息
Int J Biol Macromol. 2021 Apr 30;177:328-336. doi: 10.1016/j.ijbiomac.2021.02.137. Epub 2021 Feb 20.
A pH indicator film was prepared by mixing natural polymeric chitosan (CH) with natural dye from butterfly pudding extract (BP). The films were determined by color changes at different pH value, absorbance, thickness, moisture content, swelling property, water contact angle, mechanical property, barrier property, and microstructure of films. The structural change of film was analyzed by Fourier transform infrared spectra. The application to monitor fish freshness was also studied. The prepared film was sensitive to the changes in pH value and showed distinct color changes from pink purple to yellow, with pH value ranging from 1 to 14. The films showed visible color changes from purple-blue to dark green during fish preservation. The total volatile basic nitrogen (TVB-N) content and pH value changes of tilapia were closely related to the visual color changes in film. The result indicated that the fabricated film was a highly pH-sensitive film for monitoring fish freshness.
一种 pH 指示剂薄膜由天然高分子壳聚糖（CH）与蝴蝶布丁提取物（BP）中的天然染料混合而成。通过不同 pH 值下的颜色变化、薄膜的吸光度、厚度、水分含量、溶胀性能、水接触角、力学性能、阻隔性能和薄膜的微观结构来确定薄膜的性能。通过傅里叶变换红外光谱分析了薄膜的结构变化。还研究了该薄膜在监测鱼类新鲜度方面的应用。所制备的薄膜对 pH 值的变化敏感，其颜色从粉红色到紫色到黄色有明显的变化，pH 值范围为 1 到 14。在鱼类保鲜过程中，薄膜呈现出从紫蓝色到深绿色的可见颜色变化。总挥发性碱性氮（TVB-N）含量和罗非鱼的 pH 值变化与薄膜的视觉颜色变化密切相关。结果表明，所制备的薄膜是一种用于监测鱼类新鲜度的高 pH 值敏感薄膜。
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