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A comparison and evaluation of analysis procedures for the quantification of (2-methoxyethoxy)acetic acid in urine.

Authors
B'Hymer-C; Butler-M; Cheever-KL
Source
Anal Bioanal Chem 2005 Sep; 383(2):201-209
NIOSHTIC No.
20028683
Abstract
Several extraction and derivatization procedures were evaluated for the quantification of (2-methoxyethoxy)acetic acid (MEAA) in urine. MEAA is a metabolite and a biomarker for exposure to 2-(2-methoxyethoxy)ethanol, a glycol ether with widespread use in various industrial applications and the specific use as an anti-icing additive in the military jet fuel formulation JP-8. Quantification of glycol ether biomarkers is an active area of analytical research. Various sample preparation procedures were evaluated: liquid–liquid extraction (LLE) using ethyl acetate yielded the highest recovery, and solid-phase extraction (SPE) gave low recovery of MEAA. Two derivatization procedures were thoroughly investigated and validated, namely, silylation of MEAA with N-methyl-N-(tert-butyldimethylsilyl)trifluoroacetamide (MTBSTFA), and esterification of MEAA using ethanol. Quantification was performed by gas chromatography (GC) with a mass spectrometer as detector and using a polydimethylsiloxane (HP-1) capillary column. Deuterated 2-butoxyacetic acid (d-BAA) was used as an internal standard. Recovery studies of spiked human urine demonstrated the accuracy and precision of both procedures. The limit of detection (LOD) and other figures of merit for both derivatization procedures will be discussed in detail. Applications of these analysis procedures are also discussed.
Keywords
Biomarkers; Urinalysis; Exposure-assessment; Metabolites; Jet-engine-fuels; Glycols; Ethers; Analytical-chemistry; Analytical-methods; Sampling; Sampling-methods; Chromatographic-analysis
Contact
National Institute for Occupational Safety and Health, Division of Applied Research and Technology, 4676 Columbia Parkway, Cincinnati, OH 45226
CODEN
ABCNBP
CAS No.
111-77-3; 16024-56-9; 2516-93-0; 141-78-6; 75-09-2
Publication Date
20050901
Document Type
Journal Article
Email Address
cbhymer@cdc.gov
Fiscal Year
2005
NTIS Accession No.
NTIS Price
Issue of Publication
2
ISSN
1618-2642
NIOSH Division
DART
Priority Area
Research Tools and Approaches: Exposure Assessment Methods
Source Name
Analytical and Bioanalytical Chemistry
State
OH
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