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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
Source PublicationINTERNATIONAL BIODETERIORATION & BIODEGRADATION
ISSN0964-8305
Volume55Issue:3Pages:223-232
AbstractPhthalate 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.
DepartmentUniv 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
KeywordBiotransformation Dimethyl Phthalate Dimethyl Isophthalate Dimethyl Terephthalate Gompertz Model Mixed Substrates
Subject AreaBiotechnology & Applied Microbiology ; Environmental Sciences
Indexed Bysci
Funding ProjectLED
WOS IDWOS:000228414000008
Citation statistics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/5723
Collection热带海洋环境国家重点实验室(LTO)
Corresponding Authorjdgu@hkucc.hku.hk
Recommended Citation
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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