Simultaneous analysis of urinary phthalate metabolites of residents in Korea using isotope dilution gas chromatography-mass spectrometry

Miok Kim, Na Rae Song, Jong-Ho Choi, Jeongae Lee, Heesoo Pyo

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Phthalates are used in industry products, household items, and medical tools as plasticizers. Human exposure to phthalates has raised concern about its toxicity. In the present study, optimization was conducted for the simultaneous analysis of eight kinds of phthalate metabolites using gas chromatography-mass spectrometry (GC-MS): MEP, MiBP, MnBP, MBzP, MiNP, MEHP, MEOHP, and MEHHP. In order to minimize the matrix effect and to do quantitative analysis, isotope dilution and LLE-GC-MS methods were performed. Urine samples were enzymatically hydrolyzed, extracted with a mixture of n-hexane and ethyl ether (8:2; v:v), and subsequently derivatized with trimethylsilylation. All eight kinds of analytes showed clear resolution and high reproducibility in GC-MS results. The method detection limit ranged from 0.05ng/mL to 0.2ng/mL. Calibration curves were found to be linear from 0.2 to 100ng/mL with -2>0.992. The relative standard deviation of the intraday precision using water and urine ranged from 2.1% to 16.3%. The analysis was performed with urine samples that were collected from adults residing in the Republic of Korea. The analyzed concentration results were compared according to gender and region. As a result, DEHP metabolites showed the highest detected concentration (75.92μg/g creatinine, 100%), and MiNP, a metabolite of DiNP, showed the lowest detected concentration (0.42μg/g creatinine, 22.5%). On average, female urine (200.76μg/g creatinine) had a higher detected concentration of ∑8 phthalate metabolites than male urine. Samples from rural regions (211.96μg/g creatinine) had higher levels than samples from urban regions.

Original languageEnglish
Pages (from-to)1408-1413
Number of pages6
JournalScience of the Total Environment
Volume470-471
DOIs
Publication statusPublished - 2014 Feb 1

Fingerprint

phthalate
Metabolites
Isotopes
Gas chromatography
urine
Dilution
Mass spectrometry
Creatinine
metabolite
gas chromatography
dilution
mass spectrometry
isotope
Diethylhexyl Phthalate
Plasticizers
Hexane
Ether
urban region
Toxicity
Ethers

Keywords

  • Biomonitoring
  • Gas chromatography-mass spectrometry
  • Isotope dilution
  • Trimethylsilylation
  • Urinary phthalate metabolites

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Waste Management and Disposal
  • Environmental Engineering

Cite this

Simultaneous analysis of urinary phthalate metabolites of residents in Korea using isotope dilution gas chromatography-mass spectrometry. / Kim, Miok; Song, Na Rae; Choi, Jong-Ho; Lee, Jeongae; Pyo, Heesoo.

In: Science of the Total Environment, Vol. 470-471, 01.02.2014, p. 1408-1413.

Research output: Contribution to journalArticle

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