Rhim Jong-Whan, Hong Seok-In, Park Hwan-Man, Ng Perry K W
Department of Food Engineering, Mokpo National University, Chungkyemyon, Muangun, Chonnam, Republic of Korea.
J Agric Food Chem. 2006 Aug 9;54(16):5814-22. doi: 10.1021/jf060658h.
Four different types of chitosan-based nanocomposite films were prepared using a solvent-casting method by incorporation with four types of nanoparticles, that is, an unmodified montmorillonite (Na-MMT), an organically modified montmorillonite (Cloisite 30B), a Nano-silver, and a Ag-zeolite (Ag-Ion). X-ray diffraction patterns of the nanocomposite films indicated that a certain degree of intercalation was formed in the nanocomposite films, with the highest intercalation in the Na-MMT-incorporated films followed by films with Cloisite 30B and Ag-Ion. Scanning electron micrographs showed that in all of the nanocomposite films, except the Nano-silver-incorporated one, nanoparticles were dispersed homogeneously throughout the chitosan polymer matrix. Consequently, mechanical and barrier properties of chitosan films were affected through intercalation of nanoparticles, that is, tensile strength increased by 7-16%, whereas water vapor permeability decreased by 25-30% depending on the nanoparticle material tested. In addition, chitosan-based nanocomposite films, especially silver-containing ones, showed a promising range of antimicrobial activity.
采用溶液浇铸法，通过与四种类型的纳米颗粒（即未改性蒙脱土（Na-MMT）、有机改性蒙脱土（Cloisite 30B）、纳米银和银沸石（Ag-Ion））复合，制备了四种不同类型的壳聚糖基纳米复合薄膜。纳米复合薄膜的X射线衍射图谱表明，纳米复合薄膜中形成了一定程度的插层结构，其中Na-MMT复合薄膜的插层程度最高，其次是Cloisite 30B和Ag-Ion复合薄膜。扫描电子显微镜照片显示，在所有纳米复合薄膜中，除了纳米银复合薄膜外，纳米颗粒均均匀分散在壳聚糖聚合物基质中。因此，纳米颗粒的插层影响了壳聚糖薄膜的机械性能和阻隔性能，即拉伸强度提高了7%-16%，而水蒸气透过率根据所测试的纳米颗粒材料降低了25%-30%。此外，壳聚糖基纳米复合薄膜，尤其是含银的薄膜，表现出了良好的抗菌活性。
