An analytical method suitable for the stability control of dosage forms containing reserpine by HPLC is described. Besides reserpine the method quantitatively determines isoreserpine, 3,4-didehydroreserpine, trimethoxybenzoic acid, and renoxidine. The additional degradation products reserpic acid, and the secondary oxidation product 3,4,5,6-tetradehydroreserpine are qualitatively recorded.
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