银基蒙脱土/壳聚糖的制备及性能

为了在改善壳聚糖(CS)抑菌性能的同时提高其强度, 将银基蒙脱土(Ag-MMT)在CS的醋酸溶液中通过溶液插层法制备了银基蒙脱土/壳聚糖(Ag-MMT/CS)。在模拟体液环境中测得的银离子释放性能显示Ag-MMT/CS中的银离子可以达到平稳缓慢释放; 通过最小抑菌圈法对Ag-MMT/CS进行抑菌性能测试, 结果表明, Ag-MMT/CS对金黄色葡萄球菌有良好的抑菌效果, 抑菌圈直径可达9.2 mm, 比CS增大50.6%, 抑菌率测试结果显示蒙脱土的加入有助于吸附并杀死更多的细菌; 动态热机械分析(DMA)测试结果显示, Ag-MMT/CS的储能模量最高可达3261 MPa, 比CS提高195%, 显示出良好的动态力学性能。

Preparation and characterization of Ag-montmorillonite/chitosan

To obtain antibacterial chitosan with improved dynamic mechanic properties, the Ag-MMT was dispersed in chitosan solution dissolving in acetic acid to obtain nano Ag-MMT/CS composite via solution intercalation. The Ag⁺ ion can be released steady and slowly from Ag-MMT/CS in vitro release test in simulated fluid. The bacterial inhibition zone diameter of Ag-MMT/CS is 9.2 mm, which is 50.6% larger than that of CS, the result shows Ag-MMT/CS's good antibacterial activity against Staphylococcus aureus. And the inhibition ratio test result suggests the significant surface area and adsorption capacities of MMT help a lot to immobilize more bacteria on the surface and improve the antibacterial activity of Ag-MMT/CS. In the dynamic thermomechanical analysis (DMA) test, the storage modulus of Ag-MMT/CS is 3261 MPa, which exhibits remarkable increase (195% larger than CS) in mechanic property.