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Electrochemical behaviour of Venlafaxine and its determination in pharmaceutical products using square wave
J L Lima1, D V Loo, C Delerue-Matos
1CEQUP/Departamento de Química-Física, Faculdade de Farmácia da Universidade do Porto, Portugal.
Abstract:
An electrochemical method for the determination of Venlafaxine in pharmaceutical formulations recently available on the European market is described. The electrochemical oxidation of Venlafaxine was studied at a HMDE electrode over a wide pH range (1.9-10.0) of buffered aqueous solutions using different potential sweep techniques. The results obtained showed that the best definition of the analytical signals was found in boric acid/potassium tetrahydroxoborate buffer at pH 8.7 using anodic stripping square wave voltammetry. Recovery trials were performed to assess the accuracy of results and these were compared to those provided by a HPLC technique according to the method described in literature and to the features of the pharmaceutical formulations. A relative deviation of < 0.2% was obtained. With the developed methodology, the limit of detection was 0.124 mg/l.
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