title: Development of capillary zone electrophoresis-electrospray ionization-mass spectrometry for the determination of lamotrigine in human plasma.
abstract: A method of coupling capillary zone electrophoresis (CZE) with electrospray ionization-mass spectrometry (ESI-MS) detection has been developed for monitoring an antiepileptic drug, lamotrigine (LTG) in human plasma. The CZE-MS was developed in three stages: (i) CZE separation and ESI-MS detection of LTG and tyramine (TRM, internal standard) were simultaneously optimized by studying the influence of CZE background electrolyte (BGE) pH, BGE ionic strength, and nebulizer pressure of the MS sprayer; (ii) sheath liquid parameters, such as pH, ionic strength, organic modifier content, and flow rate of the sheath liquid, were systematically varied under optimum CZE-MS conditions developed in the first stage; (iii) MS sprayer chamber parameters (drying gas temperature and drying gas flow rate) were varied for the best MS detection of LTG. The developed assay was finally applied for the determination of LTG in plasma samples. The linear range of LTG in plasma sample assay was between 0.1-5.0 microg/mL with a limit of detection as low as 0.05 microg/mL and run time less than 6 min. Finally, the concentration-time profile of LTG in human plasma sample was found to correlate well when CZE-ESI-MS was compared to a more established method of high-performance liquid chromatography with ultraviolet detection.
authors.affiliation: Department of Chemistry, Center of Biotechnology and Drug Design, Georgia State University, Atlanta, GA, USA.
authors.forename: Jack
authors.initials: J
authors.lastname: Zheng
authors.affiliation: Department of Clinical and Administrative Science, Mercer University, Southern School of Pharmacy, Atlanta, GA, USA.
authors.forename: Michael W
authors.initials: MW
authors.lastname: Jann
authors.affiliation: Clinical Pharmacokinetics, Research Laboratory, Clinical Center Pharmacy Department, National Institutes of Health, Bethesda, MA, USA.
authors.forename: Yuen Yi
authors.initials: YY
authors.lastname: Hon
authors.affiliation: Department of Chemistry, Center of Biotechnology and Drug Design, Georgia State University, Atlanta, GA, USA.
authors.forename: Shahab A
authors.initials: SA
authors.lastname: Shamsi
mesh_terms: D000927:Anticonvulsants / Q000097:blood* / Q000737:chemistry; D004573:Electrolytes; D019075:Electrophoresis, Capillary / Q000379:methods*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D000077213:Lamotrigine; D009330:Nebulizers and Vaporizers; D009930:Organic Chemicals; D009994:Osmolar Concentration; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D014227:Triazines / Q000097:blood* / Q000737:chemistry
chemical_list: D000927:Anticonvulsants; D004573:Electrolytes; D009930:Organic Chemicals; D014227:Triazines; D000077213:Lamotrigine