Simultaneous determination of two constituents of compound felodipine controlled release tablets by HPLC / 中国药学杂志

ABSTRACT

OBJECTIVE: To establish an HPLC method to determine the dissolutions of felodipine and metoprolol tartrate in compound felodipine controlled release tablets. METHODS: An HPLC method was established with Agilent Eclipse C18 column (4.6 mm×250 mm, 5 μm).A mixture of 0.3% SDS (pH adjusted to 2.5 with phosphoric acid)-acetonitrile-methanol VVV(405010) was used as the mobile phase. The column temperature was 25°C. The flow rate was 1 mL·min-1 and the detection wavelength was set at 233 nm. RESULTS: The relative retention time of felodipine and metoprolol tartrate was 6.20 and 8.45 min respectively. The linear ranges of these two drugs were 1-24 μg·mL-1 (r=0.9999) and 10-240 μg·mL-1 (r=0.9999). The average recoveries of felodipine and metoprolol tartrate were 99.99% and 99.91% respectively. The RSDs of this method were all less than 2%. CONCLUSION: The established method is sensitive, accurate and reliable for determination of the dissolutions of felodipine and metoprolol tartrate in compound felodipine controlled release tablets.