A rapid LC-MS/MS method for determination of urinary EtG and application to a cut-off limit study
-
Beril Anilanmert
,
Ali Acar Özdemir
Abstract
Ethyl glucuronide (EtG) is a metabolite and a specific marker of alcohol consumption that can be detected days after the complete elimination of alcohol after drinking. A rapid, simple, and sensitive LC-ESI-MS/MS method for the determination of urinary ethyl glucuronide was developed and fully validated in accordance with analytical standards, using the C18 column. The whole process including sample preparation and LC-MS/MS lasted 10 min. A comprehensive validation including HorRat, measurement uncertainty, system suitability and intermediate precision calculations among analysts, and a cut-off limit study was performed. The method was applied to real samples and a cutoff limit determination study. The LOD and LOQ (using the IUPAC and Eurachem methods) were determined as 104.21 ng mL−1 and 165.00 ng mL−1. A cut-off limit of ≈ 818 ng mg−1 (normalised to creatinine) was found for urinary EtG. The results showed that the cut-off limits currently in use should be re-considered in further studies and standardised on a global scale. Normalisation to creatinine is important because of the risk of the dilution of urine intentionally or with a change of diet. The concentrations of real samples from subjects who had consumed alcohol were successfully predicted using this method, after zero HS-GC/MS results of urine alcohol concentration.
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Institute of Chemistry, Slovak Academy of Sciences
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Artikel in diesem Heft
- Catalysis in glycerol: a survey of recent advances
- A rapid LC-MS/MS method for determination of urinary EtG and application to a cut-off limit study
- Validated chiral chromatographic methods for clopidogrel bisulphate and its related substances in bulk drug and pharmaceutical dosage forms
- Effect of SO2 on SCR activity of MnOx/PG catalysts at low temperature
- Preparation of Pd/Al2O3@silicalite-1 core–shell beads and their application to hydrogenation reactions
- Effect of rapid batch decompression on hydrolysate quality after hydrothermal pretreatment of wheat straw
- Anthocyanins profile, total phenolics and antioxidant activity of two Romanian red grape varieties: Feteascǎ neagrǎ and Bǎbeascǎ neagrǎ (Vitis vinifera)
- Polyphenols, radical scavenger activity, short-chain organic acids and heavy metals of several plants extracts from “Bucharest Delta”
- Reaction of anhydrous zinc chloride with 2,3-thiophenedicarbaldehyde bis(semicarbazone) (2,3BSTCH2) and bis(thiosemicarbazone) (2,3BTSTCH2): Crystal structure of {[C6H5N2S]+[ZnCl3(C6H4N2S)]−} complex
- Synthesis and evaluation of a novel hydrophobically associating polymer based on acrylamide for enhanced oil recovery
- Synthesis of cardanol-based photo-active SET-LRP initiator and its application to preparation of UV-cured resin
- Preparation, characterization and ion adsorption properties of functionalized polystyrene modified with 1,4-phenylene diisocyanate and diethylenetriamine
- Synthesis of lanthanide-based SBA-15 mesoporous hybrids by a novel route
- Comparative ESI FT-MS and MALDI-TOF structural analyses of representative human N-linked glycans
