Transformation of dimethyl phthalate, dimethyl isophthalate and dimethyl terephthalate by Rhodococcus rubber Sa and modeling the processes using the modified Gompertz model
Li, JX; Gu, JD; Pan, L; jdgu@hkucc.hku.hk
2005
发表期刊INTERNATIONAL BIODETERIORATION & BIODEGRADATION
ISSN0964-8305
卷号55期号:3页码:223-232
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.
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
关键词Biotransformation Dimethyl Phthalate Dimethyl Isophthalate Dimethyl Terephthalate Gompertz Model Mixed Substrates
学科领域Biotechnology & Applied Microbiology ; Environmental Sciences
收录类别sci
资助项目LED
WOS记录号WOS:000228414000008
引用统计
被引频次:51[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/5723
专题热带海洋环境国家重点实验室(LTO)
通讯作者jdgu@hkucc.hku.hk
推荐引用方式
GB/T 7714
Li, JX,Gu, JD,Pan, L,et al. Transformation of dimethyl phthalate, dimethyl isophthalate and dimethyl terephthalate by Rhodococcus rubber Sa and modeling the processes using the modified Gompertz model[J]. INTERNATIONAL BIODETERIORATION & BIODEGRADATION,2005,55(3):223-232.
APA Li, JX,Gu, JD,Pan, L,&jdgu@hkucc.hku.hk.(2005).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,55(3),223-232.
MLA Li, JX,et al."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 55.3(2005):223-232.
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