title: HPLC method for simultaneous determination of cefprozil diastereomers in human plasma.
abstract: A high-performance liquid chromatography method was developed for the determination of cefprozil diastereomers in human plasma. Cefprozil exists as cis and trans isomer at the ratio of 90:10. Plasma samples were prepared by protein precipitation using acetonitrile, trichloroacetic acid and methylene chloride. After the mixtures were vortexed and centrifuged, the aqueous supernatant was injected into a reversed-phase C8 column. The mobile phase consisted of acetonitrile, glacial acetic acid and distilled water at the volume ratio of 5.5:1.75:92.75 (pH 2.7). The signals were monitored with UV detection at 280 nm. The calibration curves of cis and trans isomer were linear in concentration ranges of 0.1-25 and 0.02-2.5 microg/mL with the correlation coefficient of 0.9999 and 0.9989, respectively. After oral administration of cefprozil in humans, Cmax and Tmax of total cefprozil were 18.80 +/- 2.14 microg/mL and 2.06 +/- 0.62 h. This method was sensitive with excellent selectivity and reproducibility, and successfully applied to a bioavailability study of cefprozil in healthy subjects.
authors.affiliation: Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, San 56-1, Shillim-dong, Kwanak-gu, Seoul 151-741, Republic of Korea.
authors.forename: Tae-Hwan
authors.initials: TH
authors.lastname: Park
authors.forename: Jin-Ki
authors.initials: JK
authors.lastname: Kim
authors.forename: Jun-Pil
authors.initials: JP
authors.lastname: Jee
authors.forename: Jeong-Sook
authors.initials: JS
authors.lastname: Park
authors.forename: Chong-Kook
authors.initials: CK
authors.lastname: Kim
mesh_terms: D001682:Biological Availability; D002511:Cephalosporins / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006801:Humans; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013237:Stereoisomerism; D000097670:Cefprozil
chemical_list: D002511:Cephalosporins; D000097670:Cefprozil