纳米TiO_(2)对魔芋葡甘聚糖/玉米醇溶蛋白复合膜结构和性能的影响

Effect of Nano Titanium Dioxide on the Structure and Properties of KGM/Zein Blend Films

本文以魔芋葡甘聚糖、玉米醇溶蛋白为成膜基质,添加不同含量(1%、2%、3%)的纳米TiO_(2),以流延方式制备纳米TiO_(2)/魔芋葡甘聚糖/玉米醇溶蛋白复合膜,并对复合膜的微观结构、热性能、力学性能、疏水性、水蒸气透过率和抑菌性能进行了分析。结果表明,纳米TiO_(2)与魔芋葡甘聚糖、玉米醇溶蛋白间发生相互作用,有良好的相容性;添加纳米TiO_(2)使复合膜表面粗糙度增加,复合膜热稳定性和疏水性增强,力学性能降低;纳米TiO_(2)添加量为1%wt时,复合膜的水蒸气透过率(5.7×10-13 g·cm/(cm2·s·Pa))和溶胀率(16.4%)最小,水接触角值(99.6°)最大;复合膜对金黄色葡萄球菌和大肠杆菌有明显的抑制作用,对枯草芽孢杆菌的抑制作用不明显。本研究为纳米TiO_(2)/魔芋葡甘聚糖/玉米醇溶蛋白复合膜作为包装材料的开发与应用提供一定参考依据。

In this paper,konjac glucomannan and zein were used as film-forming substrates,and nano-TiO_(2)under different contents(1%,2%,3%)were added to prepare nano-TiO_(2)/konjac glucomannan/zein blend films by casting method.The microstructure,thermal,mechanical properties,hydrophobicity,water vapor permeability and antibacterial properties of the film were tested.The result showed that there were interactions and compatibilities between nano-TiO_(2)and konjac glucomannan/zein matrix.The roughness of surface was increased,the thermal stability and hydrophobicity were improved,but the mechanical properties were decreased.The amount of nano-TiO_(2)about 1%wt,water vapor permeability(5.7×10-13 g·cm/(cm2·s·Pa))and swelling(16.4%)got the minimum values,and the water contact angle(99.6°)had the max values.Nano-TiO_(2)/konjac glucomannan/zein blend films obvious had inhibitory effect on Staphylococcus aureus and Escherichia coli.,but not obvious on Bacillus subtilis.This study provided a reference basis for the development and application of konjac glucomannan/zein/nano-TiO_(2)as packaging materials.