茶多酚改性胶原蛋白-壳聚糖复合膜工艺优化

Effect of Tea Polyphenols on Properties of Collagen-Chitosan Based Composite Films

以鮰鱼皮胶原蛋白与壳聚糖为原料制备可食用复合膜,用茶多酚进行改性。通过正交试验,考察茶多酚添加量、热处理温度和热处理时间对复合膜性能的影响,以期降低复合膜的水蒸气透过率和增强复合膜的机械性能。结果表明:茶多酚添加量、热处理温度、热处理时间对复合膜的性能影响显著。最佳改性条件为:茶多酚添加量2%、热处理温度80℃、热处理时间30 min。在此条件下,得到的复合膜拉伸强度为(29.39±0.96)MPa,断裂伸长率为(84.22±0.05)%,水蒸气透过率为(0.20±0.01)(g·mm)/(h·m2·k Pa),溶解度为(32.06±1.23)%,透光率为(82.4±1.10)%。

The aim of this work was to develop edible composite film based on Amiurus nebulosus skin collagen and chitosan by using tea polyphenols to modify the functional properties of the composite film. Through orthogonal experiments, the effects of technological parameters including the concentration of tea polyphenols, temperature and heating time on film properties were investigated in order to reduce the water vapor transmittance and improve the mechanical properties of the composite film. The results showed that all these three parameters significantly affected the properties of the films. The optimal conditions for modification were achieved by adding 2% tea polyphenols and subsequently heating at 80 ℃ for 30 min. Under these conditions, the tensile strength, elongation at break, water vapor penetration rate, solubility and light transmittance of the composite film were(29.39 ± 0.96) MPa,(84.22 ± 0.05)%,(0.20 ± 0.01)(g·mm)/(h·m2·k Pa),(32.06 ± 1.23)% and(82.4 ± 1.10)%, respectively.