title: 2,2-bis(4-Chlorophenyl)acetic acid (DDA), a water-soluble urine biomarker of DDT metabolism in humans.
abstract: DDT metabolism in humans yields DDA as the principal urinary metabolite and potential exposure biomarker. A method for DDA analysis in human urine was developed using pentafluorobenzyl bromide and diisopropylethyl amine. Dried hexane extracts were reacted for 1 hour at room temperature. The stable DDA-pentafluorobenzyl-ester derivative was analyzed by gas chromatography-electron capture detector (GC-ECD) and confirmed by gas chromatography-mass spectrometry (GC-MS) in selective ion monitoring mode. The limit of detection for DDA was 0.1 microg/L urine by GC-ECD and 2 microg/L urine by GC-MS, with a relative standard deviation of 12%. Urine specimens from DDT applicators in Swaziland and South Africa were analyzed to evaluate the method. The mean DDA levels during the spray season and post season were 59 and 11 microg/L, respectively. These results must be interpreted cautiously because different groups of workers provided urine specimens in each case. The DDA urinalysis may be a feasible monitoring strategy for low-level occupational and residential DDT exposure assessment in antimalaria campaigns.
authors: University of California, Riverside, CA 92521, USA.
authors: Zhenshan
authors: Z
authors: Chen
authors: Francois
authors: F
authors: Maartens
authors: Helen
authors: H
authors: Vega
authors: Simon
authors: S
authors: Kunene
authors: Jonathan
authors: J
authors: Gumede
authors: Robert I
authors: RI
authors: Krieger
mesh_terms: D001682:Biological Availability; D015415:Biomarkers; D001711:Biotransformation; D003634:DDT / Q000031:analogs & derivatives* / Q000652:urine; D004563:Electrochemistry; D004784:Environmental Monitoring; D013541:Eswatini; D008401:Gas Chromatography-Mass Spectrometry; D006306:Health Surveys; D006801:Humans; D007202:Indicators and Reagents; D007306:Insecticides / Q000378:metabolism*; D012995:Solubility
chemical_list: D015415:Biomarkers; D007202:Indicators and Reagents; D007306:Insecticides; C000849:bis(p-chlorophenyl)acetic acid; D003634:DDT