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学科主题: Biotechnology & Applied Microbiology; Environmental Sciences
题名: Transformation of dimethyl phthalate, dimethyl isophthalate and dimethyl terephthalate by Rhodococcus rubber Sa and modeling the processes using the modified Gompertz model
作者: Li, JX ; Gu, JD ; Pan, L
通讯作者: jdgu@hkucc.hku.hk
关键词: biotransformation ; dimethyl phthalate ; dimethyl isophthalate ; dimethyl terephthalate ; Gompertz model ; mixed substrates
刊名: INTERNATIONAL BIODETERIORATION & BIODEGRADATION
发表日期: 2005
卷: 55, 期:3, 页:223-232
收录类别: sci
部门归属: Univ Hong Kong, Lab Environm Toxicol, Dept Ecol & Biodivers, Hong Kong, Hong Kong, Peoples R China; Chinese Acad Sci, S China Sea Inst Oceanog, LED,Surface Marine Biol & Environm Microbiol Grp, Key Lab Trop Marine Environm Dynam, Guangzhou 510301, Peoples R China; Univ Hong Kong, Swire Inst Marine Sci, Hong Kong, Hong Kong, Peoples R China
项目归属: LED
摘要: Phthalate ester isomers, including dimethyl phthalate (DMP), dimethyl isophthalate (DMI) and dimethyl terephthalate (DMT), were found to be transformed by Rhodococcus rubber Sa isolated from a mangrove sediment using DMT as a carbon source initially. At a concentration of 80 mg l(-1), transformation of DMP, DMI and DMT was achieved in 9, 1 and 5 days, respectively. During the hydrolytical transformation of DMP, DMI and DMT, their corresponding intermediates were identified as mono-methyl phthalate (MMP), mono-methyl isophthalate (MMI) and mono-methyl terephthalate (MMT), suggesting that transformation of all three isomers followed an identical biochemical pathway of de-esterification. However, none of the produced monoesters was further transformed by R. rubber Sa and they accumulated in the Culture media during incubation. It seems that further transformation of monoesters require a set of hydrolytic enzymes different from those involved in the first transformation reaction. Kinetics of DMT, DMI and DMP transformation was well described by the modified Gompertz model independent of the individual Substrate condition or a mixture of the three isomers. Both DMI and DMT were easier transformed substrates than DMP, resulting in higher maximum transformation rate (R-m) and shorter lag time phase (lambda) derived from the modified Gompertz model. The modified Gompertz model based on one-substrate system can be used in fitting transformation kinetics of mixture substrate system. Our data suggest that degradation of phthalate diesters involves different enzymes in the hydrolysis of the two identical ester groups. (c) 2005 Elsevier Ltd. All rights reserved.
WOS记录号: WOS:000228414000008
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/5723
Appears in Collections:热带海洋环境动力实验室(LTO)_期刊论文

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Li, JX; Gu, JD; Pan, L.Transformation of dimethyl phthalate, dimethyl isophthalate and dimethyl terephthalate by Rhodococcus rubber Sa and modeling the processes using the modified Gompertz model,INTERNATIONAL BIODETERIORATION & BIODEGRADATION,2005,55(3):223-232
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文件名: Transformation of dimethyl phthalate, dimethyl isophthalate and dimethyl terephthalate by Rhodococcus rubber Sa and modeling the processes using the modified Gompertz model .pdf
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