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Citation: ZHANG Xin, WU Xue-Dong, GAO Bao-Jiao. Preparation and Antibacterial Characteristics of a Novel Antibacterial Material of SiO₂-Grafted Long-chain Quaternary Ammonium Salt[J]. Chinese Journal of Applied Chemistry, ;2008, 25(12): 1455-1459. shu

Preparation and Antibacterial Characteristics of a Novel Antibacterial Material of SiO₂-Grafted Long-chain Quaternary Ammonium Salt

1.
a Ningbo Institute of Materials Technology & Engineering Chinese Academy of Sciences, Ningbo 315201;
2.
b Department of Chemical Engineering North University of China, Taiyuan

Corresponding author: ZHANG Xin,
Received Date: 20 November 2007
Available Online: 20 November 2007
Fund Project: 宁波市科技攻关资助项目(2007B1009) (2007B1009)

Polyethyleneimine was grafted on silica gel(PEI/SiO₂) by a coupling agent,then PEI on silica gel was converted to tertiary amine with epihydrin and quaterisation followed by reaction with benzyl chloride to obtain water-insoluble antibacterial material(QPEI/SiO₂).The chemical structures of the products were characterized with FTIR spectroscopy.The degree of grafting was 15.7%,the most highest quaternary degree was 1.57 mmol/g.The antibacterial characteristics and mechanisms of QPEI/SiO₂ to E.Coli and S.aureus were tested primarily.The effects of quaternary degrees on the antimicrobial property of QPEI/SiO₂ were examined.The experiment results indicate that QPEI/SiO₂ has a very strong antimicrobial ability.The antimicrobial ratio to E.Coli reached to 100% and to S.aureus can be closed to 100% when it is contacting with bacterium suspension of 1×10^{9 CFU/mL under the conditions of a dose of 15 g/L.The higher the cationic degree is,the better the antimicrobial activity is.The measured results of enzyme activitiy show that the antimicrobial mechanism of QPEI/SiO₂ is based on a sterilizing bacterium process.}
- silica gel grafted quaternary ammonium salt,
- water-insoluble antibacterial material,
- polyethyleneimine,
- antimicrobial mechanism
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Preparation and Antibacterial Characteristics of a Novel Antibacterial Material of SiO₂-Grafted Long-chain Quaternary Ammonium Salt