Disinfection of Legionella pneumophila by photocatalytic oxidation

被引：97

作者：

Cheng, Y. W.

Chan, Raphael C. Y.

Wong, P. K. ^{[1
]}

机构：

[1] Chinese Univ Hong Kong, Dept Biol, Shatin, Hong Kong, Peoples R China

[2] Chinese Univ Hong Kong, Dept Microbiol, Shatin, Hong Kong, Peoples R China

来源：

WATER RESEARCH | 2007年 / 41卷 / 04期

关键词：

disinfection; Legionella pneumophila; PCO;

D O I：

10.1016/j.watres.2006.11.033

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Photocatalytic oxidation (PCO) was proven to be efficacious in the inactivation of Legionella pneumophila serogroup 1 Strains 977, 1009, 1014 and ATCC 33153. The local (Strains 997, 1009 and 1014) and ATCC (Strain 33153) strains showed sensitivity differences towards PCO. The inactivation mechanisms of PCO were investigated by transmission and scanning electron microscopy by which PCO was found to disintegrate the cells eventually. Before the disintegration, there was lipid peroxidation of outer and cytoplasmic membrane causing holes formation and leading to the entry of center dot OH into the cells to oxidize the intracellular components. Fatty acid profile analysis found that the amount of saturated, 16-carbon branched-chain fatty acid, which is predominant in Legionella, decreased in the surviving populations from PCO. A relationship between the amount of this fatty acid and the PCO sensitivity of the tested strains was also observed. Mineralization of cells by PCO was proven by total organic carbon analysis. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：842 / 852

页数：11

共 38 条

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