Stereoselective determination of R,S-2-[4-(3-methyl-2-thienyl)phenyl]propionic acid and its taurine conjugates in dog urine by high-performance liquid chromatography.
Two high-performance liquid chromatographic methods for the stereoselective determination of R,S-2-[4-(3-methyl-2-thienyl)-phenyl]propionic acid (R,S-MTPPA), a new anti-inflammatory agent, and its taurine conjugates (R,S-MTPPA-TAU) in dog urine have been developed and validated. The urine samples were subjected to solid extraction or TLC preparation, then R,S-MTPPA and R,S-MTPPA-TAU were separated on Chiralcel OD and Chiral AGP columns, respectively, with ultraviolet absorbance detection at 272 nm. The dose-response relationships for enantiomers of R,S-MTPPA and R,S-MTPPA-TAU were linear in the concentration ranges of 0.5-50 (r>0.9993) and 5-200 microg/ml (r>0.9982), respectively. Recoveries of all tested enantiomers from dog urine were roughly 90% within the above concentration ranges. Intra- and inter-day reproducibilities were sufficient for metabolic studies. These methods were applied to stereoselective determination of the enantiomers in dog urine after administration of either S- or R-MTPPA.
Konishi
T
T
Research and Development Laboratories, Maruho Co., Ltd., Osaka, Japan.
Nishikawa
H
H
Kitamura
S
S
Tatsumi
K
K
D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004285:Dogs; D010666:Phenylpropionates / Q000737:chemistry / Q000652:urine*; D013237:Stereoisomerism; D013654:Taurine / Q000737:chemistry / Q000652:urine*
D010666:Phenylpropionates; D013654:Taurine; C104139:2-(4-(3-methyl-2-thienyl)phenyl)propionic acid