可食性壳聚糖膜性能的研究

本文研究了壳聚糖膜的制备及对壳聚糖膜进行抗张强度、透湿率、透气系数和吸湿性能的测试。结果表明,1.5%的壳聚糖浓度成膜浓度较适宜; 壳聚糖膜用中温干燥(55℃)时的机械性能相对较佳,并且低温下成的膜较高温下成的膜相对较透明、柔软,高温下成的膜略有淡黄色;随膜厚的增加,膜的透湿率增大;适量的增塑剂可以改善膜的性能,随着甘油浓度的增加,膜的透湿率、透气系数也随之增加,膜的透气系数还随成膜温度的升高而增大。

The effects of different processing factors on physical and mechanical properties of the edible chitosan film werestudied in this paper. The results showed that the film formed with 1.5% concentration of chitosan and drying temperature at55℃ had larger tensile strength, and the films formed at low temperatures(5℃or room temperature) were more transparentand flexible than films formed at higher temperatures(55℃or 80℃). Films formed at higher temperatures showed a slightyellow color. The water vapor permeability also increased with the increasing of film thickness. Furthermore, suitableamount of glycerin added as plasticizer could improve the film properties, and the water vapor permeability and gas perme-ability also increased with the increasing of glycerin concentration. Besides, the gas permeability increased with the elevationof drying temperature .