title: [Synthesis, characterization and antimicrobial activity of nano-fumed silica derivative with quaternary ammonium salts].
abstract: Nano-fumed silica reacted with gamma-chlopropyltrimethoxysilane as a coupling agent, and then by quaternization with N,N-dimethyl-n-tetradecylamine, finally the nano-fumed silica derivative with quaternary ammonium salts was obtained. The nano-fumed silica derivative was investigated by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimeter (DSC), and Zeta sizer nano series. The antimicrobial properties of the nano-fumed silica derivative against selected microorganisms were tested by the quantitative suspension method. The results revealed that (1) gamma-chlopropyltrimethoxysilane can be bound to the surface of the nano-fumed silica With increasing the amount of gamma-chlopropyltrimethoxysilane, the amount of surface hydroxyl groups of nano-fumed silica decreases. (2) The Zeta potential showed that the isoelectric point of the nano-fumed silica and the modified nano-fumed silica is pH 4.8 and pH 10.5, respectively. The shift of the isoelectric point is due to the quaternary ammonium groups. (3) The obtained nano-fumed silica derivative has significant inhibition effect on the growth of microorganisms, and the bactericidal rates in 15 min for E. coil (8099), S. aureus (ATCC6538) and C. albicans(ATCC10231) were 99.99%,, 99.99% and 94.12%, respectively.
authors.affiliation: The Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu 610065, China.
authors.forename: Xia
authors.initials: X
authors.lastname: Xu
authors.forename: Qin-huan
authors.initials: QH
authors.lastname: Yang
authors.forename: Wan-xue
authors.initials: WX
authors.lastname: Lei
authors.forename: Zheng-jun
authors.initials: ZJ
authors.lastname: Li
authors.forename: Zhuang-zhi
authors.initials: ZZ
authors.lastname: He
authors.forename: Fang
authors.initials: F
authors.lastname: Lin
authors.forename: Ting-you
authors.initials: TY
authors.lastname: Zhang
mesh_terms: D000890:Anti-Infective Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects; D005658:Fungi / Q000187:drug effects; D000644:Quaternary Ammonium Compounds; D012822:Silicon Dioxide / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D000890:Anti-Infective Agents; D000644:Quaternary Ammonium Compounds; D012822:Silicon Dioxide