title: Determination of iguratimod in rat plasma by high performance liquid chromatography: method and application.
abstract: A high-performance liquid chromatographic method with UV detection has been developed for the determination of iguratimod (T-614) in rat plasma. Plasma was precipitated with acetonitrile after the addition of the internal standard (IS), N-[4-(2-formylaminoacetyl)-5-methoxy-2-phenoxyphenyl]-methanesulfonamide. The chromatographic separation was achieved on a reversed-phase C(18) column with the mobile phase acetonitrile-acetic acid aqueous solution, pH 4.5 (40:60, v/v), at a flow rate of 1 mL/min, and the UV detection wavelength was set at 257 nm. The calibration curve was linear over the range 0.10-50.0 microg/mL, and the lower limit of quantification was 0.10 microg/mL. The intra- and inter-day relative standard deviations were all less than 11.5%. The method has been successfully applied to study the pharmacokinetics of iguratimod in rats. A single 10 mg/kg dose of iguratimod was given to the rats by intragastric administration. The mean maximum plasma concentration of iguratimod for the six rats was 14.5 microg/mL, and the mean elimination half-life of iguratimod was 4.0 h.
authors.affiliation: Department of Pharmaceutical Analysis, China Pharmaceutical University, Nanjing, People's Republic of China.
authors.forename: Ting
authors.initials: T
authors.lastname: Zhou
authors.forename: Li
authors.initials: L
authors.lastname: Ding
authors.forename: Xiaomin
authors.initials: X
authors.lastname: Li
authors.forename: Fei
authors.initials: F
authors.lastname: Zhang
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhang
authors.forename: Bing
authors.initials: B
authors.lastname: Gong
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Guo
mesh_terms: D000818:Animals; D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D002867:Chromones / Q000097:blood* / Q000493:pharmacokinetics; D005260:Female; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet; D013449:Sulfonamides / Q000097:blood* / Q000493:pharmacokinetics
chemical_list: D002867:Chromones; D013449:Sulfonamides; C519076:iguratimod