Preparation and Bactericidal Properties of Nano-SiO2 Grafted with Macromolecular Quaternary Ammonium Salts Derivative of Alkylated Polyethylenimines
Water-soluble polyethylenimine (PEI) was grafted onto the surface of nano-SiO2 particles through the intermedium effect of 4-bromobutyryl chloride, and the water-insoluble SiO2 containing macromolecular quaternary ammonium salts (MQAS/SiO2) was prepared followed by the N-alkylation of coated PEI with 1-bromohexane and idomethane. The results of FT-IR analysis testified that PEI is successfully immobilized on the surface of SiO2 nanoparticles. The minimum inhibitory concentrations of MQAS/SiO2 against Gram-positive bacterium, Staphylococcus aureus, and Gram-negative bacterium, Escherichia coli, are 100ug/ml and 1200ug/ml, respectively. The bactericidal efficiency of exhaustively washed MQAS/SiO2 did not decline significantly compared to the MQAS/SiO2without washing.
Wei Pan and Jianghong Gong
Y. G. Wu et al., "Preparation and Bactericidal Properties of Nano-SiO2 Grafted with Macromolecular Quaternary Ammonium Salts Derivative of Alkylated Polyethylenimines", Key Engineering Materials, Vols. 368-372, pp. 1519-1522, 2008