基于甲基纤维素/壳聚糖纳米纤维和小檗果花青苷的 pH 响应型彩色指示剂薄膜，用于实时监测肉的新鲜度。
pH-responsive color indicator films based on methylcellulose/chitosan nanofiber and barberry anthocyanins for real-time monitoring of meat freshness.
机构信息
Food Safety and Hygiene Division, Department of Environmental Health, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
Student Research Committee, Department of Food Sciences and Technology, Faculty of Nutrition and Food Sciences, Tabriz University of Medical Sciences, Tabriz, Iran.
出版信息
Int J Biol Macromol. 2021 Jan 1;166:741-750. doi: 10.1016/j.ijbiomac.2020.10.231. Epub 2020 Oct 31.
A new pH-responsive color indicator film was prepared by blending barberry anthocyanin (BA) with methylcellulose (MC)/chitosan nanofiber (ChNF) composite film. The addition of ChNF and BA increased the mechanical and water barrier properties but reduced the UV-vis light transmittance of the composite film. Anthocyanin showed proper compatibility with the composite film. The color indicator film showed an apparent color change in response to pH changes and ammonia gas, being suitable for indicating the change in food pH, the formation of volatile nitrogen compounds, and food decay. The color indicator film changed clearly from reddish-pink to pale peach and finally to yellow when exposed to different pH buffers. However, in response to ammonia vapor, the color changed from pink to pale green and yellow. Besides, the color indicator film exhibited remarkable antioxidant activity. Therefore, the pH-sensing color indicator film can be used as a smart indicator for real-time freshness monitoring of meat and seafood products.
一种新的 pH 响应型彩色指示剂薄膜是通过将小檗属植物花青苷（BA）与甲基纤维素（MC）/壳聚糖纳米纤维（ChNF）复合薄膜共混制备的。ChNF 和 BA 的加入增加了复合薄膜的机械和水阻隔性能，但降低了其紫外可见光透过率。花青苷与复合薄膜具有适当的相容性。该颜色指示剂薄膜在响应 pH 值变化和氨气时显示出明显的颜色变化，适用于指示食品 pH 值变化、挥发性含氮化合物的形成和食物腐败。颜色指示剂薄膜在暴露于不同的 pH 缓冲液时，颜色从红粉色变为浅桃色，最后变为黄色。然而，对氨气的响应，颜色从粉红色变为浅绿色和黄色。此外，该颜色指示剂薄膜表现出显著的抗氧化活性。因此，这种 pH 感应显色指示剂薄膜可用作肉类和海鲜产品实时新鲜度监测的智能指示剂。
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