title: High performance liquid chromatographic analysis of a new proton pump inhibitor KR60436 and its active metabolite O-demethyl-KR60436 in rat plasma samples using column-switching.
abstract: A fully automated high performance liquid chromatography with column-switching was developed for the simultaneous determination of KR60436, a new reversible proton pump inhibitor, and its active metabolite O-demethyl-KR60436 from rat plasma samples. Plasma sample (50 microl) was directly introduced onto a Capcell Pak MF Ph-1 column (10 x 4 mm I.D.) where primary separation was occurred to remove proteins and concentrate target substances using acetonitrile-potassium phosphate (pH 7, 0.1 M) (2:8, v/v). The drug molecules eluted from MF Ph-1 column were focused in an intermediate column (10 x 2 mm I.D.) by the valve switching step. The substances enriched in intermediate column were eluted and separated on a Vydac 218MR53 column (250 x 3.2 mm I.D.) using acetonitrile-potassium phosphate (pH 7, 0.02 M) (47:53, v/v) at a flow rate of 0.5 ml/min when the valve status was switched back to A position. The method showed excellent sensitivity (detection limit of 2 ng/ml) with small volume of samples (50 microl), good precision and accuracy, and speed (total analysis time 24 min) without any loss in chromatographic efficiency. The response was linear (r2 > or = 0.999) over the concentration range of 5-500 ng/ml.
authors: Bioanalysis Laboratory, College of Pharmacy and Medical Resources Research Center, Wonkwang University, Shinyongdong, Iksan, Korea.
authors: H M
authors: HM
authors: Lee
authors: H Y
authors: HY
authors: Lee
authors: J K
authors: JK
authors: Choi
authors: H S
authors: HS
authors: Lee
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid; D003640:Dealkylation; D004791:Enzyme Inhibitors / Q000097:blood* / Q000493:pharmacokinetics; D008297:Male; D054328:Proton Pump Inhibitors; D011758:Pyrroles / Q000494:pharmacology; D011804:Quinolines / Q000494:pharmacology; D051381:Rats; D017207:Rats, Sprague-Dawley; D015203:Reproducibility of Results; D013056:Spectrophotometry, Ultraviolet
chemical_list: C439392:1-(2-methyl-4-methoxyphenyl)-4-((2-hydroxyethyl)amino)-6-trifluoromethoxy-2,3-dihydropyrrolo(3,2-c)quinoline; D004791:Enzyme Inhibitors; D054328:Proton Pump Inhibitors; D011758:Pyrroles; D011804:Quinolines