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Determination of ethyl glucuronide in hair samples by liquid chromatography/electrospray tandem mass spectrometry
Author(s) -
Morini Luca,
Politi Lucia,
Groppi Angelo,
Stramesi Cristiana,
Polettini Aldo
Publication year - 2006
Publication title -
journal of mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 1076-5174
DOI - 10.1002/jms.943
Subject(s) - chemistry , chromatography , ethyl glucuronide , detection limit , dichloromethane , electrospray , mass spectrometry , tandem mass spectrometry , selected reaction monitoring , liquid chromatography–mass spectrometry , methanol , electrospray ionization , alcohol , solvent , organic chemistry , alcohol consumption
A method for the determination of ethyl glucuronide (EtG) in hair samples, using liquid chromatography/electrospray tandem mass spectrometry (LC/ESI‐MS/MS), was developed and validated. The treatment of hair samples was as follows: to 100 mg of washed (dichloromethane followed by methanol, 1 ml each) and cut (1–2 mm) material, 700 µl of water, 20 µl of internal standard solution (pentadeuterated EtG, D 5 ‐EtG, 500 µg/l) and 20 µl of methanol were added. Samples were incubated at 25 °C overnight and then ultrasonicated for 2 h. Finally, 8 µl of the centrifuged solution (13 000 rpm) were analyzed by LC/ESI‐MS/MS in negative ion mode. The surviving ions of EtG and D 5 ‐EtG were monitored together with the following MRM transitions: m / z 221 → 75, m / z 221 → 85 (EtG) and m / z 226 → 75, m / z 226 → 85 (D 5 ‐EtG). The method exhibited a mean correlation coefficient better than 0.9998 over the dynamic range (3–2000 pg/mg). The lower limit of quantification (LLOQ) and the limit of detection (LOD) were 3 and 2 pg/mg respectively. The intra‐ and interday precision and accuracy were studied at four different concentration levels (3, 5, 56 and 160 pg/mg) and were always better than 7% ( n = 5). Matrix effects did not exceed 20%. The method was applied to several hair samples taken from autopsies of known alcoholics, from patients in withdrawal treatment, from social drinkers, from adult teetotalers and from children not exposed to ethanol, with EtG concentrations globally ranging from ≤2 to 4180 pg/mg. Copyright © 2005 John Wiley & Sons, Ltd.