Assessing Human Exposure to Phthalates Using Monoesters and Their Oxidized Metabolites as Biomarkers

By Barr, Dana B.

Description
Government Reference Publication

Excerpt
Excerpt: Phthalates are a group of industrial chemicals with many commercial uses, such as solvents, additives, and plasticizers. For example, di-(2-ethylhexyl) phthalate (DEHP) is added in varying amounts to certain plastics, such as polyvinyl chloride, to increase their flexibility. In humans, phthalates are metabolized to their respective monoesters, conjugated, and eliminated. However, despite the high production and use of DEHP, we have recently found that the urinary levels of the DEHP metabolite mono-(2-ethylhexyl) phthalate (MEHP) in 2,541 persons in the United States were lower than we anticipated, especially when compared with urinary metabolite levels of other commonly used phthalates. This finding raised questions about the sensitivity of this biomarker for assessing DEHP exposure. We explored the utility of two other DEHP metabolites, mono-(2-ethyl-5-oxohexyl) phthalate (MEOHP) and mono-(2-ethyl-5-hydroxyhexyl) phthalate (MEHHP), as additional DEHP biomarkers. These metabolites are formed by oxidative metabolism of MEHP. In urine from 62 people, both the range and the mean urinary levels of MEOHP and MEHHP were on average 4-fold higher than those of MEHP; the mean of the individual ratios of MEHHP/MEOHP, MEHHP/MEHP, and MEOHP/MEHP were 1.4, 8.2, and 5.9, respectively. These data suggest that MEOHP and MEHHP are more sensitive biomarkers of exposure to DEHP than is MEHP. These findings also suggest a predominant human metabolic route for DEHP hydrolysis to MEHP followed by oxidation of MEHP; they also imply that a similar mechanism may be relevant for other high-molecular?weight phthalates, such as di-n-octyl, di-isononyl, and di-isodecyl phthalates. Key words: DEHP, exposure, human, phthalate, urine.

Book Id: WPLBN0000213503
Format Type: PDF eBook
File Size: 150,027 KB.
Reproduction Date: 2005
Full Text

Title:

Assessing Human Exposure to Phthalates Using Monoesters and Their Oxidized Metabolites as Biomarkers

Author:

Barr, Dana B.

Volume:

Language:

English

Subject:

Government publications, United Nations., United Nations. Office for Disarmament Affairs

Collection:

Disarmament Documents

Subcollection:

Historic
Publication Date:

Publisher:

United Nations - Office for Disarmament Affairs (UNODA)

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