Abstract

This study aimed to verify the effects of different drying methods and temperatures of fish myofibrillar proteins (MPs), on the technological properties of biodegradable films. The MPs were dried by lyophilization at −60 °C for 48 h and by convective drying of hot air at 40 °C, 60 °C, and 80 °C. In the drying by convection, drying curves were constructed and the adjustments of mathematical models were evaluated. The films were formulated with 1.5% proteins (w/v) and 30% glycerol (w/w), and they were characterized. The drying times found were 540 min (40 °C), 300 min (60 °C), and 120 min (80 °C). The “Logarithmic” models followed by the “Diffusion approach” were the ones that best fit for all temperatures. The results of protein electrophoresis and the characterization of the film showed that the convective drying caused changes in the three-dimensional structure of the proteins, favoring the formation of a highly cross-linked protein network with numerous hydrogen bonds, hydrophobic interactions, and disulfide bonds, and generating films with properties equal to or better than lyophilized proteins.

摘要

这项研究旨在验证不同的干燥方法和温度的鱼肌原纤维蛋白（MPs）对可生物降解膜的技术性能的影响。将MP于-60°C冷冻干燥48 h，并在40°C，60°C和80°C的热空气对流干燥。在对流干燥中，绘制干燥曲线并评估数学模型的调整。用1.5％的蛋白质（w / v）和30％的甘油（w / w）配制膜，并对其进行表征。发现的干燥时间为540分钟（40℃），300分钟（60℃）和120分钟（80℃）。最适合所有温度的是“对数”模型和“扩散法”。