scholarly journals Electrochemical Degradation of Dimethyl Phthalate Ester on a DSA®Electrode

2014 ◽  
Author(s):  
Fernanda L. Souza ◽  
José M. Aquino ◽  
Douglas W. Miwa ◽  
Manuel A. Rodrigo ◽  
Artur J. Motheo
Keyword(s):  
Phthalate Ester ◽  
Electrochemical Degradation ◽  
Dimethyl Phthalate ◽  
Dimethyl Phthalate Ester

Electrochemical degradation of the dimethyl phthalate ester on a fluoride-doped Ti/β-PbO2 anode

Chemosphere ◽  
2014 ◽  
Vol 109 ◽  
pp. 187-194 ◽  
Author(s):  
Fernanda L. Souza ◽  
José M. Aquino ◽  
Kallyni Irikura ◽  
Douglas W. Miwa ◽  
Manuel A. Rodrigo ◽  
...  
Keyword(s):  
Phthalate Ester ◽  
Electrochemical Degradation ◽  
Dimethyl Phthalate ◽  
Dimethyl Phthalate Ester ◽  
Pbo2 Anode

Photo-assisted electrochemical degradation of the dimethyl phthalate ester on DSA® electrode

2014 ◽  
Vol 2 (2) ◽  
pp. 811-818 ◽  
Author(s):  
Fernanda L. Souza ◽  
José M. Aquino ◽  
Douglas W. Miwa ◽  
Manuel A. Rodrigo ◽  
Artur J. Motheo
Keyword(s):  
Phthalate Ester ◽  
Electrochemical Degradation ◽  
Dimethyl Phthalate ◽  
Dimethyl Phthalate Ester

Biochemical pathway and degradation of phthalate ester isomers by bacteria

2005 ◽  
Vol 52 (8) ◽  
pp. 241-248 ◽  
Author(s):  
J.-D. Gu ◽  
J. Li ◽  
Y. Wang
Keyword(s):  
Aromatic Ring ◽  
Enrichment Culture ◽  
Klebsiella Oxytoca ◽  
Sole Source ◽  
Phthalate Ester ◽  
Ring Cleavage ◽  
Mangrove Sediment ◽  
Individual Species ◽  
Dimethyl Phthalate ◽  
Dimethyl Phthalate Ester

Degradation of dimethyl isophthalate (DMI) and dimethyl phthalate ester (DMPE) was investigated using microorganisms isolated from mangrove sediment of Hong Kong Mai Po Nature Reserve. One enrichment culture was capable of utilizing DMI as the sole source of carbon and energy, but none of the bacteria in the enrichment culture was capable of degrading DMI alone. In co-culture of two bacteria, degradation was observed proceeding through monomethyl isophthalate (MMI) ester and isophthalic acid (IPA) before the aromatic ring opening. Using DMI as the sole carbon and energy source, Klebsiella oxytoca Sc and Methylobacterium mesophilicum Sr degraded DMI through the biochemical cooperation. The initial hydrolytic reaction of the ester bond was by K. oxytoca Sc and the next step of transformation was by M. mesophilicum Sr, and IPA was degraded by both of them. In another investigation, a novel bacterium, strain MPsc, was isolated for degradation of dimethyl phthalate ester (DMPE) also from the mangrove sediment. On the basis of phenotypic, biochemical and 16S rDNA gene sequence analyses, the strain MPsc should be considered as a new bacterium at the genus level (8% differences). This strain, together with a Rhodococcus zopfii isolated from the same mangrove sediment, was able to degrade DMPE aerobically. The consortium consisting of the two species degraded 450mg/l DMPE within 3 days as the sole source of carbon and energy, but none of the individual species alone was able to transform DMPE. Furthermore, the biochemical degradation pathway proceeded through monomethyl phthalate (MMP), phthalic acid (PA) and then protocatechuate before aromatic ring cleavage. Our results suggest that degradation of complex organic compounds including DMI and DMPE may be carried out by several members of microorganisms working together in the natural environments.

scholarly journals Complete Degradation of the Endocrine-Disrupting Chemical Dimethyl Phthalate ester by Flavobacterium sp.

2007 ◽  
Vol 53 (6) ◽  
pp. 740-744 ◽  
Author(s):  
Yutaka Kido ◽  
Teruo Tanaka ◽  
Kazunori Yamada ◽  
Hideo Hachiyanagi ◽  
Hiroshige Baba ◽  
...  
Keyword(s):  
Phthalate Ester ◽  
Dimethyl Phthalate ◽  
Endocrine Disrupting Chemical ◽  
Complete Degradation ◽  
Endocrine Disrupting ◽  
Dimethyl Phthalate Ester

scholarly journals Dimethyl Phthalate Induces Blood Immunotoxicity Through Oxidative Damage And Caspase-Dependent Apoptosis

2021 ◽  
Author(s):  
Zhenxing Chi ◽  
Hongwei Lin ◽  
Xuanlin Meng ◽  
Jieqiong Zhou ◽  
Li Xiang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Oxidative Damage ◽  
Phthalate Esters ◽  
Immune Defense ◽  
Phthalate Ester ◽  
Low Molecular Weight ◽  
Intragastric Administration ◽  
Exposure Level ◽  
Dimethyl Phthalate ◽  
Cell Counts

Abstract Dimethyl phthalate (DMP), a low molecular weight phthalate ester, is present in ectoparasiticides, plastics, and insect repellants, has been linked to neurotoxic, reproductive, and endocrine disruptive responses. However, its blood immunotoxic effects and mechanism remain poorly understood. In this study, rats were exposed to graded concentrations of DMP through intragastric administration to assess the blood immunotoxic effects using a combination assay of biomarker, cytometry, and transcriptomics. DMP treatment altered the redox status of rats, causing that oxidative damage. Significantly decreased blood cell counts and disordered antibody and cytokine secretion were observed, suggesting the suppressed immune defense and destructed inflammatory regulation. Flow cytometry showed for lymphocytes, especially CD3+CD4+ T cells, apoptosis/necrosis occurred positively related to DMP exposure level. Transcriptomics revealed responses that were in line with oxidative damage effects. Overexpression of the Bcl-2 family genes and activation of the Fas/FasL pathway trigger downstream caspase cascade, causing reactive oxygen species signaling mediated apoptosis/necrosis. This is the first report on immunotoxic effects of low molecular weight phthalate esters.

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