title: Metabolic Degradation of 1,4-dichloronaphthalene by Pseudomonas sp. HY.
abstract: There is increasing concern regarding the adverse health effects of polychlorinated naphthalenes (PCNs). The metabolic degradation of 1,4-dichloronaphthalene (1,4-DCN) as a model PCN, was studied using a strain of Pseudomonas sp. HY. The metabolites were analyzed by gas chromatography-mass spectrometry (GC-MS). A series of metabolites including dihydroxy-dichloro-naphthalene, epoxy-dichlorinated naphthalene, dichlorinated naphthol, and dichlorinated salicylic acid were identified. The time-concentration plots of the degradation curves of 1,4-DCN was also obtained from the experiments, which set the initial concentration of 1,4-DCN to 10 mg/L and 20 mg/L, respectively. The results showed that 98% removal could be achieved within 48 h at an initial 1,4-DCN concentration of 10 mg/L. Nevertheless, it took 144 h to reach the same degradation efficiency at an initial concentration of 20 mg/L. The degradation of 1,4-DCN may not remove the chloride ions during the processes and the metabolites may not benefit the bacterial growth. The research suggests a metabolic pathway of 1,4-DCN, which is critical for the treatment of this compound through biological processes.
authors: Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha 410082, China. jianyu@hnu.edu.cn.
authors: Jian
authors: J
authors: Yu
authors: Guangzhou Water Supply Co., Guangzhou 510600, China. willy-427@163.com.
authors: Xiaoli
authors: X
authors: Wu
authors: State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China. songyouqun@163.com.
authors: Youqun
authors: Y
authors: Song
authors: Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha 410082, China. yujianpro@126.com.
authors: Wenhui
authors: W
authors: Ren
authors: Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha 410082, China. tang@minnwater.com.|Minn Water LLC, Minneapolis, MN 55441, USA. tang@minnwater.com.
authors: Hao L
authors: HL
authors: Tang
mesh_terms: D001673:Biodegradation, Environmental; D008401:Gas Chromatography-Mass Spectrometry; D053858:Metabolic Networks and Pathways; D009281:Naphthalenes / Q000378:metabolism*; D011549:Pseudomonas / Q000378:metabolism*
chemical_list: D009281:Naphthalenes
keywords: 1,4-dichloronaphthalene; metabolism; metabolite