Simple and sensitive determination of the new antitumor drug CKD-602 in human plasma by liquid chromatography

A simple and sensitive high-performance liquid chromatographic with fluorescence detection method has been developed and validated for the determination of the new antitumor agent CKD-602 in human plasma. Plasma proteins were precipitated with methanol and the samples were acidified with 7% (v/v) perchloric acid. The supernatants were analyzed by HPLC using a Capcell Pak C-18 UG120 column and a mixture of methanol-0.1 M hexane-1-sulfonic acid in methanol-0.01 M TEMED in water at pH 6.0 (40:1:59, v/v) as the mobile phase. The lower limit of quantification was 0.2 ng/ml using 200 p,1 plasma samples. Mean within-run precision and between-run precision at six tested concentrations (0.2-400 ng/ml) were less than or equal to10% and mean accuracy was less than or equal to15%. Stability studies showed that CKD-602 is stable in both plasma and methanol extracts for at least 3 months at -30degreesC. The described method was used for the pharmacokinetic analysis of CKD-602 during clinical phase I studies, in patients with solid tumors. (C) 2002 Elsevier Science B.V. All rights reserved.