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《Journal of the Chinese Ceramic Society》 2006-01
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ZHANG Kuihua 1,2, TAN Shaozao1, LIU Yingliang1 (1.Department of Chemistry, Jinan Univesity, Guangzhou 510630; 2.College of Material Science and Engineering, Huaqiao University, Quanzhou 362000, Fujian, China)  
Sodium-montmorillonite was modified with different quaternary ammonium salts through the ion-exchange method. Through antimicrobial experiment, it is found that modified montmorillonite with different quaternary ammonium salts has excellent antimicrobial activity against gram-positive bacteria (S.aereus) and gram-negative bacteria (E.coli). The antimicrobial activities increase with the increase of the mass fraction of organic matter. Meanwhile, modified montmorillonite with bis-quaternary ammonium salts shows the best antimicrobial activity. Its minimal inhibitory concentration against S.aereus and E.coli is 6.25 mg/L and 12.5 mg/L, respectively. Modified montmorillonite after being in contact with bacteria for different time pe- riods was observed by a scanning electron microscope. The results show that the bacteria adhere to the surface of modified montmorillonite first and then they undergo slow cell-lysis. Meanwhile, the X-ray diffraction and thermogravimetric analysis of modified montmorillonite after soaking in 0.9% saline for different time were performed. The results show that interlayer spacing and mass fraction of organic matter of modified montmorillonite decrease with soaking time increasing. Namely, quaternary ammonium salts are dissociated from the interlayer of montmorillonite and directly exert an antimicrobial effect on the bacteria in suspension. Therefore, the antimicrobial activities of modified montmorillonite have a cooperative effect of surface absorption of modified montmorillonite and of releasing the quaternary ammonium salts from modified montmorillonite.
【Fund】: 国家自然科学基金(20171018);; 广东省自然科学基金重点(013201);; 广东省科技计划(2004B20201026);; 暨南大学引进优秀人才科研启动基金(5105013)资助项目。
【CateGory Index】: O621.29
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