title: Determination of brazilein in rat plasma after intravenous administration by HPLC.
abstract: Quantification of brazilein in rat plasma following intravenous administration was achieved by reversed-phase high-performance liquid chromatography using a mobile phase of acetonitrile-0.05 m potassium dihydrogen phosphate water (containing 0.5% triethylamine, pH 3.0; 20:80 v/v) and UV detection at 445 nm. The method was linear (determination coefficient, r(2) = 0.9992) within the tested range (0.313-5.0 microg/mL). Intra- and inter-day precision coefficients of variation and accuracy bias were acceptable (maximal CV value was 2.06% for intra-day and 1.71% for inter-day) over the entire range. The recoveries were 81.48, 84.61 and 82.83% for concentrations of 0.313, 1.25 and 5.0 microg/mL, respectively. The concentration-time curve of brazilein after intravenous administration was fitted to the two-compartment model. This is the first time that brazilein in rat plasma was detected by HPLC-UV method and its pharmacokinetic characteristic was comprehensively studied.
authors.affiliation: Protein Science Laboratory of the Ministry of Education, Laboratory of Pharmaceutical Sciences, Department of Biological Sciences and Biotechnology, Tsinghua University, Beijing 100084, People's Republic of China.
authors.forename: Jiaqi
authors.initials: J
authors.lastname: Lan
authors.forename: Jun
authors.initials: J
authors.lastname: Hu
authors.forename: Bonan
authors.initials: B
authors.lastname: Li
authors.forename: Dongming
authors.initials: D
authors.lastname: Xing
authors.forename: Chengcheng
authors.initials: C
authors.lastname: Liu
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Lijun
authors.initials: L
authors.lastname: Du
mesh_terms: D000818:Animals; D001578:Benzopyrans / Q000008:administration & dosage / Q000097:blood* / Q000493:pharmacokinetics; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004365:Drugs, Chinese Herbal / Q000008:administration & dosage / Q000032:analysis* / Q000493:pharmacokinetics; D007192:Indenes / Q000008:administration & dosage / Q000097:blood* / Q000493:pharmacokinetics; D007275:Injections, Intravenous; D008297:Male; D051381:Rats; D017208:Rats, Wistar; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet / Q000379:methods*
chemical_list: D001578:Benzopyrans; D004365:Drugs, Chinese Herbal; D007192:Indenes; C050295:brazilein