| Abstract: | Direct plasma loading on a LiChrospher ADS C18 cartridge on-line coupled to an analytical Zorbax XDB C18 column was used to analyze felodipine by means of positive atmospheric pressure chemical ionization (APCI) tandem mass spectrometric (MS/MS) detection. Appropriate sensitivity, accuracy, and precision were obtained using an ion trap mass analyzer operated in a multiple reaction monitoring (MRM) mode. Diethyl-4-(2,3-dichlorophenyl)-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate) was used as an internal standard. The method was fully validated. The method was successfully applied to a pilot bioequivalence study made on extended release oral dosage forms containing 10 mg of felodipine, under fed and fasting conditions. |
