壳聚糖基抗菌保鲜膜制备工艺的优化

为提高壳聚糖基抗菌保鲜膜的强度,以拉伸强度为指标,考察丙三醇、聚乙烯醇、纳米TiO_2和纳他霉素添加量对壳聚糖基抗菌保鲜膜拉伸强度的影响,在此基础上利用响应面法优化其制备的工艺参数,并采用扫描电镜(SEM)观察其微观结构。结果表明,壳聚糖基抗菌保鲜膜最佳制备工艺参数为:丙三醇添加量为0.8%、聚乙烯醇添加量为0.75%、纳米TiO_2添加量为0.08%、纳他霉素添加量为0.075%。在此条件下,壳聚糖基抗菌保鲜膜性能参数为:拉伸强度为12.37 MPa,断裂伸长率为34.08%,膜厚度为0.65 mm,透湿量为563 g/(m~2·24 h),透氧系数为2.294×10~(-15)mL·m~(-2)·s~(-1)·Pa~(-1),透光率为57.4%。扫描电镜观察结果表明,壳聚糖基抗菌保鲜膜表面光滑、连续、细致,各组分具有良好的相容性。

Process Optimization for the Chitosan-based Antibacterial Preservative Film

In order to improve the strength of the chitosan-based antibacterial preservative film, effects of additions of glycerol, polyvinyl alcohol, nano-TiO2 and natamycin on the tensile strength of the chitosan-based antibacterial preservative film were investigated by evaluating the tensile strength as an index. After that, the response surface method was used to optimize the process parameters, and scanning electron microscopy(SEM) was used to observe the microstructure of the obtained films. The results showed that, the optimum condition for the chitosan-based composite film was as follows: the addition of glycerol was 0.8%, the amount of polyvinyl alcohol was 0.75%, the addition of nanamycin was 0.075%, and the addition of nano-TiO2 was 0.08%, respectively. Under this condition, the physical characteristics of the chitosan-based antimicrobial film were as follows: the tensile strength was 12.37 MPa, the elongation at break was 34.08%, the film thickness was 0.65 mm, the moisture permeability was 563 g/(m2·24 h), and the light transmittance was 57.4%, the oxygen permeability coefficient was 2.294×10-15 mL·m-2·s-1·Pa-1. The SEM results showed that, the chitosan-based antimicrobial film had a smooth, continuous structure, and its components had good compatibility.