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A validated SPME-GC-MS method for simultaneous quantification of club drugs in human urine.
Forensic Sci Int. 2007 Sep 13; 171(2-3):142-50.FS

Abstract

A solid-phase microextraction-gas chromatographic-mass spectrometric (SPME-GC-MS) method has been developed and validated for measuring four club drugs in human urine. These drugs include gamma-hydroxybutyrate (GHB), ketamine (KET), methamphetamine (MAMP), and methylenedioxymethamphetamine (MDMA). These drugs are referred to as 'club drugs' because of their prevalence at parties and raves. Deuterium labeled internal standards for each of the four drugs was included in the assay to aid in quantitation. The drugs were spiked into human urine and derivatized using pyridine and hexylchloroformate to make them suitable for GC-MS analysis. The SPME conditions of extraction time/temperature and desorption time/temperature were optimized to yield the highest peak area for each of the four drugs. The final SPME parameters included a 90 degrees C extraction for 20min with a 1min desorption in the GC injector at 225 degrees C using a splitless injection. All SPME work was done using a 100microm PDMS fiber by Supelco. The ratio of pyridine to hexylchloroformate for derivatization was also optimized. The GC separation was carried out on a VF-5ht column by Varian (30m, 0.25mm i.d., 0.10microm film thickness) using a temperature program of 150-270 degrees C at 10 degrees C/min. The instrument used was a ThermoFinnigan Trace GC-Polaris Q interfaced with a LEAP CombiPal autosampler. The data was collected by using extracted ion chromatograms of marker m/z values for each drug from the total ion chromatograms (TIC) (full scan mode). Calibration curves with R(2)>0.99 were generated each day using the peak area ratios (peak area drug/peak area internal standard) versus concentration. The validated method resulted in intra-day and inter-day precision (% R.S.D.) of less than 15% and a % error of less than 15% for four concentrations in the range of 0.05-20microg/mL (MAMP) and 0.10-20microg/mL (GHB, KET, and MDMA). This method has the advantage of an easy sample preparation with acceptable accuracy and precision for the simultaneous quantification of these four drugs of abuse and shows no interference from the urine matrix.

Authors+Show Affiliations

The Citadel, Chemistry Department, 171 Moultrie Street, Charleston, SC 29409-6220, United States. stacy.brown@citadel.eduNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Validation Study

Language

eng

PubMed ID

17158009

Citation

Brown, Stacy D., et al. "A Validated SPME-GC-MS Method for Simultaneous Quantification of Club Drugs in Human Urine." Forensic Science International, vol. 171, no. 2-3, 2007, pp. 142-50.
Brown SD, Rhodes DJ, Pritchard BJ. A validated SPME-GC-MS method for simultaneous quantification of club drugs in human urine. Forensic Sci Int. 2007;171(2-3):142-50.
Brown, S. D., Rhodes, D. J., & Pritchard, B. J. (2007). A validated SPME-GC-MS method for simultaneous quantification of club drugs in human urine. Forensic Science International, 171(2-3), 142-50.
Brown SD, Rhodes DJ, Pritchard BJ. A Validated SPME-GC-MS Method for Simultaneous Quantification of Club Drugs in Human Urine. Forensic Sci Int. 2007 Sep 13;171(2-3):142-50. PubMed PMID: 17158009.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A validated SPME-GC-MS method for simultaneous quantification of club drugs in human urine. AU - Brown,Stacy D, AU - Rhodes,Daniel J, AU - Pritchard,Boyd J, Y1 - 2006/12/08/ PY - 2006/06/29/received PY - 2006/10/20/revised PY - 2006/10/27/accepted PY - 2006/12/13/pubmed PY - 2007/10/6/medline PY - 2006/12/13/entrez SP - 142 EP - 50 JF - Forensic science international JO - Forensic Sci Int VL - 171 IS - 2-3 N2 - A solid-phase microextraction-gas chromatographic-mass spectrometric (SPME-GC-MS) method has been developed and validated for measuring four club drugs in human urine. These drugs include gamma-hydroxybutyrate (GHB), ketamine (KET), methamphetamine (MAMP), and methylenedioxymethamphetamine (MDMA). These drugs are referred to as 'club drugs' because of their prevalence at parties and raves. Deuterium labeled internal standards for each of the four drugs was included in the assay to aid in quantitation. The drugs were spiked into human urine and derivatized using pyridine and hexylchloroformate to make them suitable for GC-MS analysis. The SPME conditions of extraction time/temperature and desorption time/temperature were optimized to yield the highest peak area for each of the four drugs. The final SPME parameters included a 90 degrees C extraction for 20min with a 1min desorption in the GC injector at 225 degrees C using a splitless injection. All SPME work was done using a 100microm PDMS fiber by Supelco. The ratio of pyridine to hexylchloroformate for derivatization was also optimized. The GC separation was carried out on a VF-5ht column by Varian (30m, 0.25mm i.d., 0.10microm film thickness) using a temperature program of 150-270 degrees C at 10 degrees C/min. The instrument used was a ThermoFinnigan Trace GC-Polaris Q interfaced with a LEAP CombiPal autosampler. The data was collected by using extracted ion chromatograms of marker m/z values for each drug from the total ion chromatograms (TIC) (full scan mode). Calibration curves with R(2)>0.99 were generated each day using the peak area ratios (peak area drug/peak area internal standard) versus concentration. The validated method resulted in intra-day and inter-day precision (% R.S.D.) of less than 15% and a % error of less than 15% for four concentrations in the range of 0.05-20microg/mL (MAMP) and 0.10-20microg/mL (GHB, KET, and MDMA). This method has the advantage of an easy sample preparation with acceptable accuracy and precision for the simultaneous quantification of these four drugs of abuse and shows no interference from the urine matrix. SN - 1872-6283 UR - https://www.unboundmedicine.com/medline/citation/17158009/A_validated_SPME_GC_MS_method_for_simultaneous_quantification_of_club_drugs_in_human_urine_ DB - PRIME DP - Unbound Medicine ER -