School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China.
School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China; China-UK Joint Laboratory for Nondestructive Detection of Agro-products, Jiangsu University, Zhenjiang 212013, China.
Food Chem. 2019 Jan 30;272:306-312. doi: 10.1016/j.foodchem.2018.08.041. Epub 2018 Aug 10.
This study aims to develop an intelligent indicating film based on biodegradable polymers incorporated with roselle anthocyanins to monitor pork freshness. Three different films were prepared by using two substances of starch, polyvinyl alcohol and chitosan. The UV-vis spectra and color of anthocyanins changed at pH 2-12. SEM photographs showed that the compatibility of films was improved with the addition of anthocyanins. Furthermore, the polyvinyl alcohol/chitosan/roselle anthocyanins film had the highest tensile strength (98.28 MPa). The starch/polyvinyl alcohol/roselle anthocyanins film had the highest antioxidant activity (524.07%) and the best color stability. The starch/polyvinyl alcohol/roselle anthocyanins film showed visible changes from red to green when employed to monitor the freshness of pork stored at 25 °C, before the TVB-N value of the pork gradually increased to the rejection limit (15 mg/100 g) at 36 h. Therefore, the indicator film can be used to monitor pork freshness for intelligent packaging.
本研究旨在开发一种基于可生物降解聚合物的智能指示薄膜，该薄膜结合了洛神花花青素，用于监测猪肉的新鲜度。使用两种物质——淀粉、聚乙烯醇和壳聚糖——制备了三种不同的薄膜。花青素在 pH 2-12 时的紫外可见光谱和颜色发生变化。SEM 照片表明，随着花青素的添加，薄膜的相容性得到了提高。此外，聚乙烯醇/壳聚糖/洛神花花青素薄膜具有最高的拉伸强度（98.28 MPa）。淀粉/聚乙烯醇/洛神花花青素薄膜具有最高的抗氧化活性（524.07%）和最佳的颜色稳定性。当用于监测在 25°C 下储存的猪肉的新鲜度时，淀粉/聚乙烯醇/洛神花花青素薄膜显示出从红色到绿色的可见变化，然后猪肉的 TVB-N 值逐渐增加到拒收极限（15mg/100g）在 36 小时。因此，该指示薄膜可用于智能包装监测猪肉的新鲜度。
