title: High-performance liquid chromatographic assay of cefazolin in rat tissues.
abstract: A rapid, sensitive and reproducible high-performance liquid chromatographic (HPLC) assay for cefazolin in rat tissues was developed. Tissue samples were homogenized in distilled water, acidified with 8.5% phosphoric acid, and centrifuged. Cefazolin was isolated from the supernatant by solid-phase extraction on C18 cartridges. The eluate containing cefazolin and internal standard, cephalexin, was injected onto a reversed-phase C18 column and eluted with a mobile phase of 23% methanol in 0.02 M sodium phosphate monobasic (pH 5.0) and detected with UV absorbance at 270 nm. Recoveries of cefazolin were 33.7 +/- 2.5%, 45.4 +/- 2.1%, and 42.9 +/- 1.0% from liver, spleen and lung, respectively. The calibration curves for cefazolin were established at 0.5-1500 micrograms/g in spleen, 0.1-250 micrograms/g in liver and 0.1-75 micrograms/g in lung. The assay was reproducible with within-day and between-day variations of 1-2 and 1-4%, respectively. Application of the assay for tissue distribution of cefazolin in liposomal targeting study was demonstrated.
authors.affiliation: Department of Pharmaceutics, University of Houston, Texas Medical Center 77030.
authors.forename: D
authors.initials: D
authors.lastname: Liang
authors.forename: D
authors.initials: D
authors.lastname: Chow
authors.forename: C
authors.initials: C
authors.lastname: White
mesh_terms: D000818:Animals; D002437:Cefazolin / Q000008:administration & dosage / Q000032:analysis* / Q000493:pharmacokinetics; D002851:Chromatography, High Pressure Liquid; D007202:Indicators and Reagents; D008081:Liposomes; D008099:Liver / Q000737:chemistry; D008168:Lung / Q000737:chemistry; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D013056:Spectrophotometry, Ultraviolet; D013154:Spleen / Q000737:chemistry; D014018:Tissue Distribution
chemical_list: D007202:Indicators and Reagents; D008081:Liposomes; D002437:Cefazolin