该文为开发新型可降解抗菌包装材料,以冬凌草甲素和壳聚糖为原料制备复合膜,研究了冬凌草甲素对复合膜理化特性和抑菌性能的影响,并采用傅里叶红外光谱、扫描电镜和差示扫描量热仪分析了复合膜的微观结构。结果表明,随着冬凌草甲素含量的增加,复合膜的透光率、拉伸强度和断裂伸长率逐渐下降,水蒸气透过系数显著降低(P<0.05);对复合膜的微观结构研究显示,冬凌草甲素与壳聚糖的功能基团形成了氢键,有较好的相容性;冬凌草甲素质量浓度为50 μg/mL的复合膜的各项性能指标良好,热稳定性最好,其复合膜液对大肠杆菌和金黄色葡萄球菌的抑菌活性分别提高了28.13%和12.57%,该研究为其应用于食品保鲜提供依据。
In order to obtain new degradable antimicrobial packaging material, the composite films were prepared by incorporating different mass fraction Oridonin into chitosan solution. The effects of Oridonin on physical properties and antibacterial activities of the composite film were investigated, and the composite films were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy and differential scanning calorimetry. The results showed that with the increasing concentration of Oridonin, the transmittance, the tensile strength and elongation at break of the composite film decreased gradually, while the water vapor permeability coefficient declined remarkably (P<0.05). Microstructure analysis of the composite films indicated excellent compatibility as a result of the formation of hydrogen-bonding system between Oridonin and chitosan. The composite films with 50 μg/mL Oridonin showed good performance and thermal stability. The antibacterial activity of the composite film against Escherichia coli and Staphylococcus aureus increased by 28.13% and 12.57% respectively. This study provides a basis for its application in food preservation.
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