Kumar Raj, Ghoshal Gargi, Goyal Meenakshi
CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, 695019 India.
Dr. S.S. Bhatnagar University Institute of Chemical Engineering & Technology, Panjab University, Chandigarh, 160014 India.
J Food Sci Technol. 2021 Apr;58(4):1227-1237. doi: 10.1007/s13197-020-04685-y. Epub 2020 Aug 6.
Composite films comprising modified corn starch and gelatin were developed using a solvent casting technique. The effect of varied content of citric acid and gelatin on the functional properties of the corn starch and composite films, respectively, was investigated. Modified corn starch films enriched with 5% citric acid presented excellent film properties like solubility, swelling index, water vapor permeability, and mechanical property as compared to other films. Similarly, composite films enriched with a ratio (4:1) also exhibited excellent film properties like mechanical and opacity than other composite films. FTIR results confirmed the cross linking among the modified corn starch chains, which is responsible for the enhancement in the film properties. From SEM results, it was noticed that the modified corn starch films exhibited slightly rougher, less shiny than the composite films. Efficacy of the composite solution as a coating formulation in terms of the quality and shelf life of the cucumber investigated. From the results, it was noted that the composite film forming solution as a coating formulation has the potential to extend the shelf-life of the cucumbers additionally up to 16 days.
采用溶液浇铸技术制备了包含改性玉米淀粉和明胶的复合薄膜。分别研究了不同含量的柠檬酸和明胶对玉米淀粉及复合薄膜功能特性的影响。与其他薄膜相比，富含5%柠檬酸的改性玉米淀粉薄膜在溶解性、溶胀指数、水蒸气透过率和机械性能等方面表现出优异的薄膜性能。同样，富含比例为(4:1)的复合薄膜在机械性能和不透明度方面也比其他复合薄膜表现出优异的薄膜性能。傅里叶变换红外光谱（FTIR）结果证实了改性玉米淀粉链之间的交联，这是薄膜性能增强的原因。从扫描电子显微镜（SEM）结果可以看出，改性玉米淀粉薄膜比复合薄膜略显粗糙、光泽度较低。研究了复合溶液作为涂层配方对黄瓜品质和货架期的影响。结果表明，复合成膜溶液作为涂层配方有潜力将黄瓜的货架期额外延长至16天。
