title: Determination of ceftazidime in plasma and cerebrospinal fluid by micellar electrokinetic chromatography with direct sample injection.
abstract: A simple micellar electrokinetic chromatography (MEKC) with UV detection at 254 nm for analysis of ceftazidime in plasma and in cerebrospinal fluid (CSF) by direct injection without any sample pretreatment is described. The separation of ceftazidime from biological matrix was performed at 25 degrees C using a background electrolyte consisting of Tris buffer with sodium dodecyl sulfate (SDS) as the electrolyte solution. Under optimal MEKC condition, good separation with high efficiency and short analyses time is achieved. Several parameters affecting the separation of the drug from biological matrix were studied, including pH and concentration of the Tris buffer and SDS. Using cefazolin as an internal standard (IS), the linear ranges of the method for the determination of ceftazidime in plasma and in CSF were all over the range of 3-90 microg/mL; the detection limit of the drug in plasma and in CSF (signal-to-noise ratio = 3; injection 0.5 psi, 5 s) was 2.0 microg/mL. The applicability of the proposed method for determination of ceftazidime in plasma and CSF collected after intravenous administration of 2 g ceftazidime in patients with meningitis was demonstrated.
authors.affiliation: Graduate Institute of Pharmaceutical Sciences, Kaohsiung Medical University.
authors.forename: Hsin-Hua
authors.initials: HH
authors.lastname: Yeh
authors.affiliation: Department of Neurology, Kaohsiung Medical University, Chung-Ho Memorial Hospital.
authors.forename: Yuan-Han
authors.initials: YH
authors.lastname: Yang
authors.affiliation: Graduate Institute of Pharmaceutical Sciences, Kaohsiung Medical University.
authors.forename: Yu-Wei
authors.initials: YW
authors.lastname: Chou
authors.affiliation: School of Medicine, Kaohsiung Medical University.
authors.forename: Ju-Yun
authors.initials: JY
authors.lastname: Ko
authors.affiliation: School of Medicine, Kaohsiung Medical University.
authors.forename: Chia-An
authors.initials: CA
authors.lastname: Chou
authors.affiliation: Graduate Institute of Pharmaceutical Sciences, Kaohsiung Medical University.|Department of Pharmacy, Kaohsiung Medical University, Chung-Ho Memorial Hospital, Kaohsiung, Taiwan.
authors.forename: Su-Hwei
authors.initials: SH
authors.lastname: Chen
mesh_terms: D000328:Adult; D000368:Aged; D002021:Buffers; D002442:Ceftazidime / Q000097:blood* / Q000134:cerebrospinal fluid* / Q000627:therapeutic use; D020374:Chromatography, Micellar Electrokinetic Capillary / Q000379:methods*; D006801:Humans; D008297:Male; D008581:Meningitis / Q000097:blood / Q000188:drug therapy; D015203:Reproducibility of Results; D013056:Spectrophotometry, Ultraviolet
chemical_list: D002021:Buffers; D002442:Ceftazidime
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