title: Aerobic biodegradation of odorous dimethyl disulfide in aqueous medium by isolated Bacillus cereus GIGAN2 and identification of transformation intermediates.
abstract: A novel, flagellated, rod-shape, Gram-positive facultative aerobe, was isolated and identified as Bacillus cereus GIGAN2. It can effectively remove model odorous organics dimethyl disulfide (DMDS) in aqueous solution under aerobic conditions. Initial concentration, pH value and temperature played important role in DMDS biodegradation, and up to 100% of 10mgL(-1) of DMDS could be removed within 96h under the optimum conditions (30°C, pH 7.0 and 200rpm) with a maximum biodegradation rate constant of 0.0330h(-1) and minimum half-life of 21.0h, respectively. Three main intermediates were identified using gas chromatography-mass spectrometry during this biodegradation process. Further, a reaction scheme is also proposed to explain the possible DMDS biodegradation mechanism by GIGAN2 based on the above-identified intermediates. Overall, this is the first report to demonstrate a newly isolated strain using high concentrated DMDS as the sole carbon and energy source with high efficiency.
authors.affiliation: State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Zhishu
authors.initials: Z
authors.lastname: Liang
authors.affiliation: State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
authors.forename: Taicheng
authors.initials: T
authors.lastname: An
authors.affiliation: State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China. Electronic address: ligy1999@gig.ac.cn.
authors.forename: Guiying
authors.initials: G
authors.lastname: Li
authors.affiliation: State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Zhengyong
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D000332:Aerobiosis; D001409:Bacillus cereus / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D001673:Biodegradation, Environmental; D001709:Biotechnology / Q000379:methods*; D002681:China; D004220:Disulfides / Q000378:metabolism*; D008401:Gas Chromatography-Mass Spectrometry; D006207:Half-Life; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D009812:Odorants; D012722:Sewage / Q000382:microbiology; D013696:Temperature; D014867:Water / Q000737:chemistry / Q000378:metabolism
chemical_list: D004220:Disulfides; D012722:Sewage; D014867:Water; C021181:dimethyl disulfide
keywords: Bacillus cereus; Biodegradation; Dimethyl disulfide; Kinetics; Mechanism