title: The use of CE ECL with ionic liquid for the determination of drug alkaloids and applications in human urine.
abstract: A new approach for the determination of methylephedrine hydrochloride (ME), thebaine, codeine phosphate (CP), and acetylcodeine (AC) was established by CE-ECL with ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate). The conditions for the CE separation, ECL detection, and the effect of ionic liquid were systematically investigated. Under the optimal conditions, the four analytes were well separated within 8 min using 1-butyl-3-methylimidazolium tetrafluoroborate as additive in the electrophoretic buffer. The concentration detection limits of ME, thebaine, CP, and AC were 2.1 x 10(-8), 1.4 x 10(-7), 6.3 x 10(-8), and 3.6 x 10(-8) mol/L (S/N=3), respectively. The LOQs (S/N=10) in real human urine samples were 7.6 x 10(-7) mol/L for ME, 3.6 x 10(-6) mol/L for thebaine, 6.5 x 10(-7) mol/L for CP, and 4.6 x 10(-7) mol/L for AC, respectively. The recoveries of four alkaloids at different levels in human urine samples were between 90.0 and 103.5%. The developed method was successfully applied to the determination of four drug alkaloids in human urine samples.
authors.affiliation: College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang, PR China. liuym9518@sina.com
authors.forename: Yan-Ming
authors.initials: YM
authors.lastname: Liu
authors.forename: Wei
authors.initials: W
authors.lastname: Tian
authors.forename: Yu-Xiu
authors.initials: YX
authors.lastname: Jia
authors.forename: Hai-Yan
authors.initials: HY
authors.lastname: Yue
mesh_terms: D019075:Electrophoresis, Capillary / Q000379:methods*; D004809:Ephedrine / Q000031:analogs & derivatives* / Q000032:analysis / Q000652:urine; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007093:Imidazoles / Q000737:chemistry; D052578:Ionic Liquids / Q000737:chemistry*; D016014:Linear Models; D008163:Luminescent Measurements / Q000379:methods*; D009022:Morphine Derivatives / Q000032:analysis / Q000652:urine; D009994:Osmolar Concentration; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: C419324:1-butyl-3-methylimidazolium tetrafluoroborate; D007093:Imidazoles; D052578:Ionic Liquids; D009022:Morphine Derivatives; C041707:N-methylephedrine; D004809:Ephedrine