Department of Food Material and Process Design Engineering, Faculty of Food Science and Technology, Gorgan University of Agricultural Sciences and Natural Resources, Beheshti Avenue, Gorgan, Iran.
Department of Food Material and Process Design Engineering, Faculty of Food Science and Technology, Gorgan University of Agricultural Sciences and Natural Resources, Beheshti Avenue, Gorgan, Iran.
Carbohydr Polym. 2015 Mar 15;118:24-9. doi: 10.1016/j.carbpol.2014.11.015. Epub 2014 Nov 15.
Different ratios of whey protein concentrate (WPC):pullulan (PUL) (70:30, 50:50, 30:70%w/w) and various rates of beeswax (BW) (0, 10, 20, and 30%w/wglycerol) were applied to prepare biodegradable WPC-PUL films containing glycerol as a plasticizer, for the first time. Thickness, moisture content, water solubility, water vapour permeability, colour, and mechanical properties of prepared films were measured. Higher ratios of WPC:PUL led to more desirable physical and mechanical properties; in other words, lower rates of thickness, moisture content, water solubility and water vapour permeability, and higher elongations were achieved. Application of BW (especially in higher contents) could successfully improve colour indices, diminish water solubility (nearly 12%) and water vapour permeability (approximately 3×10(-11)gm(-1)s(-1)Pa(-1)), and increase tensile strength (by about 7MPa) of WPC-PUL blend films. Our edible films enjoyed great whiteness and ignorable yellowness indices, making it a suitable alternative for application in food products. Overall, WPC70-PUL30 containing 30% BW resulted in the best performance of physical and mechanical aspects as an optimum film.
首次应用乳清蛋白浓缩物（WPC）：普鲁兰（PUL）不同比例（70:30、50:50、30:70%w/w）和不同含量的蜂蜡（BW）（0、10、20 和 30%w/w 甘油），制备含有甘油作为增塑剂的可生物降解 WPC-PUL 薄膜。测量了所制备薄膜的厚度、水分含量、水溶性、水蒸气透过性、颜色和机械性能。较高的 WPC:PUL 比例导致更理想的物理和机械性能；换句话说，厚度、水分含量、水溶性和水蒸气透过率降低，伸长率提高。BW 的应用（特别是在较高含量下）可以成功改善颜色指数，降低水溶性（近 12%）和水蒸气透过率（约 3×10(-11)gm(-1)s(-1)Pa(-1)），并提高 WPC-PUL 共混膜的拉伸强度（约 7MPa）。我们的可食用薄膜具有极好的白度和可忽略的黄色指数，是食品应用的合适替代品。总体而言，WPC70-PUL30 含 30% BW 的薄膜在物理和机械性能方面表现最佳。
