title: Determination of osthole in rat plasma by high-performance liquid chromatograph using cloud-point extraction.
abstract: A new straightforward method based on cloud-point extraction (CPE) was developed to determine osthole in rat plasma by reversed phase high-performance liquid chromatography with ultraviolet detection using a photodiode array detector. The non-ionic surfactant Triton X-114 was chosen as the extract solvent. Variable parameters affecting the CPE efficiency were evaluated and optimized. A Zorbax SB-C(18) column was used for elution separation at 25 degrees C with detection wavelength at 322 nm. Under the optimum conditions, the method was shown to be reproducible and reliable with intra-day precision below 7.62%, inter-day precision below 6.37%, and accuracy within +/-5.02% and mean extraction recovery more than 90.4%, which were all calculated using a range of spiked samples at three concentrations of 0.5, 5.0 and 15.0 microgmL(-1) for osthole in plasma. The calibration curve for the analyte was linear in the range from 0.1 to 20 microgmL(-1) with the correlation coefficients greater than 0.9981. Limit of detection (S/N=3) was less than 0.03 microgmL(-1)and limit of quantification (S/N=10) was less than 0.1 microgmL(-1). After strict validation, the method was successfully applied to the pharmacokinetic study of osthole in rats after oral and intravenous administration, respectively.
authors.affiliation: Department of chemistry, Fourth Military Medical University, Xi'an, Shanxi 710032, PR China.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhou
authors.forename: Si Wang
authors.initials: SW
authors.lastname: Wang
authors.forename: Xiao Li
authors.initials: XL
authors.lastname: Sun
mesh_terms: D000818:Animals; D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D003374:Coumarins / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics; D008297:Male; D015394:Molecular Structure; D051381:Rats; D017208:Rats, Wistar; D012965:Sodium Chloride; D013501:Surface-Active Agents / Q000737:chemistry; D013696:Temperature; D013997:Time Factors
chemical_list: D003374:Coumarins; D013501:Surface-Active Agents; D012965:Sodium Chloride; C046627:osthol