An analytical method was developed for enantiomeric determination of amphetamine and methamphetamine in human urine. The enantiomers were isolated from urine by solid-phase extraction, and diastereomers were formed by derivatization with the chiral Marfey's reagent (1-fluoro-2,4-dinitrophenyl- 5-l-aniline amide). The diastereomers were separated by reversed-phase high- performance liquid chromatography in a water/methanol mobile phase and detected by absorbance spectrophotometry at 340 nm. Linear standard curves were obtained for all four enantiomers over a concentration range of 0.16- 1.00 mg/L in urine. The detection limit was 0.16 mg/L urine for each enantiomer, and the limit of quantitation was 0.40 mg/L. The urine of 10 decedents was analyzed by this method and by a previously published precolumn derivatization procedure using (-)-1-(9-fluorenyl)ethyl chloroformate (FLEC) as the derivatizing agent and fluorescence detection. Comparison of the results of the two methods by linear regression showed comparable results for both d-amphetamine and d-methamphetamine. Neither method detected the presence of the l-enantiomers in the urine samples.
ASJC Scopus subject areas
- Analytical Chemistry
- Environmental Chemistry
- Health, Toxicology and Mutagenesis
- Chemical Health and Safety