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3483280 
Journal Article 
Analytical method for urinary metabolites as biomarkers for monitoring exposure to phthalates by gas chromatography/mass spectrometry 
Yoshida, T 
2017 
Yes 
Biomedical Chromatography
ISSN: 0269-3879
EISSN: 1099-0801 
31 
English 
Phthalates, widely used as plasticizers, have been detected in indoor air, but there have been few reports on methods of analyzing urinary metabolites as biomarkers to monitor exposure to di-n-pentyl phthalate or di-n-hexyl phthalate. Presented here is a cost-effective and sensitive analytical method for the determination of urinary metabolites of phthalates containing these two compounds. Nine urinary phthalate metabolites were enzymatically hydrolyzed and extracted with toluene: monomethyl phthalate, monoethyl phthalate, monoisobutyl phthalate, mono-n-butyl phthalate, mono-n-pentyl phthalate, mono-n-hexyl phthalate, monocyclohexyl phthalate, monobenzyl phthalate and mono(2-ethyl-5-carboxypentyl) phthalate. After transformation to their tert-butyldimethylsilyl derivatives, they were analyzed by gas chromatography/mass spectrometry in the electron impact ionization mode. The calibration curves for the metabolites were linear at urinary concentrations of up to 30 μg/L, showing that they could be determined accurately and precisely (detection limits 0.1-0.4 μg/L, quantification limits 0.3-1.3 μg/L). The urine samples collected could be stored for up to 1 month at -20°C. The proposed analytical method was used to examine urine samples from seven healthy volunteers. This method should be useful for monitoring phthalate exposure in the general population. 
Biomarkers/urine; Calibration; Gas Chromatography-Mass Spectrometry/methods; Limit of Detection; Occupational Exposure; Phthalic Acids/urine; Reproducibility of Results; general population; plasticizer; tert-butyldimethylsilyl derivative 
IRIS
• Dibutyl Phthalate (DBP)
     Database Searches
          LitSearch Jul 2016 - Jan 2017
               Considered new
               PubMed
          LitSearch Jan 2017 - July 2017
               WOS
          LitSearch July 2017 - Sept 2018
               Prior Search Overlap
               WOS
• Diisobutyl Phthalate (DIBP) Final
     Database Searches
          January 2017 Update
          July 2017 Update
               Web of Science
               PubMed
     No Primary Data on Toxic Effects
          Measurement methods
• Phthalates – Targeted Search for Epidemiological Studies
     Source – all searches
          Pubmed
     Excluded
     Source - August 2017 Update (Private)
          Pubmed