title: [Inactivation of Mycobacteria mucogenicum in drinking water: chlorine resistance and mechanism analysis].
abstract: In recent years, chlorine-resistant bacteria were detected in drinking water distribution systems which threatened the drinking water safety. Our group detected one strain named Mycobacteria mucogenicum from the drinking water distribution system of a city in south China. This paper studied chlorine resistance and mechanism of Mycobacteria mucogenicum. Inactivation experiments of one strain Mycobacteria mucogenicum were conducted with free chlorine, monochloramind and chlorine dioxide. The CT values of 99.9% inactivation by free chlorine, monochloramine and chlorine dioxide were detected as (76.25 +/- 47.55)mg.min.L-1, (1396 +/-382)mg.min.L-1, (13.5 +/- 4.9) mg.min L-1. Using transmission electronmicroscopy (TEM) observed the inactivation process of Mycobacteria mucogenicum. The bacteria surface hydrophobic of Mycobacteria mucogenicum was 37.2%. Mycobacteria mucogenicum has a higher hydrophobicity than other bacteria which prevented the diffusion of chlorine into cells. Mycobacteria mucogenicum is more resistant to chorine than other bacteria.
authors.affiliation: School of Environment, Tsinghua University, Beijing 100084, China. zhengq06@mails.tsinghua.edu.cn
authors.forename: Qi
authors.initials: Q
authors.lastname: Zheng
authors.forename: Chao
authors.initials: C
authors.lastname: Chen
authors.forename: Xiao-Jian
authors.initials: XJ
authors.lastname: Zhang
authors.forename: Pin-Pin
authors.initials: PP
authors.lastname: Lu
authors.forename: Yuan-Yuan
authors.initials: YY
authors.lastname: Liu
authors.forename: Yu-Qiao
authors.initials: YQ
authors.lastname: Chen
mesh_terms: D002700:Chloramines / Q000494:pharmacology; D002713:Chlorine / Q000494:pharmacology*; D017606:Chlorine Compounds / Q000494:pharmacology; D004202:Disinfectants / Q000494:pharmacology*; D060766:Drinking Water / Q000382:microbiology*; D024881:Drug Resistance, Bacterial; D057927:Hydrophobic and Hydrophilic Interactions; D009161:Mycobacterium / Q000187:drug effects*; D010087:Oxides / Q000494:pharmacology; D014871:Water Microbiology
chemical_list: D002700:Chloramines; D017606:Chlorine Compounds; D004202:Disinfectants; D060766:Drinking Water; D010087:Oxides; D002713:Chlorine; C025109:chlorine dioxide; C030816:chloramine