壳聚糖基抑菌抗氧化活性复合膜的制备及其性能研究
Preparation and properties of chitosan-based antibacterial and antioxidative composite films
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摘要: 为获得具有良好功能特性的壳聚糖(CS)基复合膜材料,采用混合溶液浇筑法制备含有纳米细菌纤维素(nBC)、曲酸(KA)和姜黄素(CUR)的CS基抑菌抗氧化活性复合膜(CS/nBC/KA/CUR),考查不同组分复合膜的水分阻隔性能、机械性能、光学性能、抑菌活性和抗氧化活性。结果表明,CS/nBC/KA/CUR复合膜中各组分之间主要是通过氢键与范德华力相互作用,膜内部结晶度明显增强。相较于CS/nBC、CS/nBC/CUR和CS/nBC/KA复合膜,CS/nBC/KA/CUR复合膜的水溶性显著下降,水蒸气透过率比CS/nBC复合膜提升近24%,拉伸强度比CS/nBC/KA复合膜提高近3倍,断裂伸长率比CS/nBC/KA复合膜提高约1.8%,对E.coli的抑菌效果比其余复合膜平均提升约12.2%,ABTS自由基清除率比CS/nBC复合膜最高提升约35.2%。CS/nBC/KA/CUR复合膜结合了各组分的优势,在食品抑菌抗氧化活性包装材料的开发领域具有一定潜在价值。Abstract: In order to obtain chitosan (CS) based composite film materials with satisfactory functional properties, CS based antibacterial and antioxidant composite films (CS/nBC/KA/CUR) containing nanobacterium cellulose (nBC), curcumin (CUR) and kojic acid (KA) was prepared by mixed solution casting method. The barrier properties, mechanical properties, optical properties, antibacterial activity, and antioxidant activity of different component composite films were investigated.The results showed that the components of CS/nBC/KA/CUR composite film interacted with each other mainly by hydrogen bonding and van der Waals force, and the interior of the film showed a relatively enhanced crystallinity. Compared with the other composite films, the water solubility of CS/nBC/KA/CUR composite films was decreased significantly. The water vapor transmission rate was increased by nearly 24% compared with CS/nBC composite films. The tensile strength was increased by nearly 3 times, and the elongation at break was increased by about 1.8% compared with CS/nBC/KA composite films. The antibacterial effect against E.coli was increased by about 12.2% compared with the other composite films, and the ABTS free radical scavenging rate was most greatly increased by 35.2% compared with CS/nBC composite films. Therefore, CS/nBC/KA/CUR composite films combined the advantages of each components and showed a certain potential value in the development of active food packaging materials.
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Key words:
- chitosan /
- kojic acid /
- curcumin /
- composite films /
- antibacterial activity /
- antioxidant activity
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