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Here is described the fabrication and the electrochemical characterization of a newly modified carbon paste electrode with a manganese complex film possessing thiophene-2-carboxylic acid and triethanolamine as ligands. This electrode was used for the electrochemical determination of cyanocobalamin (vitamin B 12 ). A selective, low cost and low detection limit assay of vitamin B 12  was developed using square wave voltammetry. Potential interferents were determined and the results showed that they did not affect the analysis, indicating the selectivity of the proposed assay. This methodology was also applied to the determination of cyanocobalamin in tablets and dietary supplements, showing that the proposed electrochemical sensor was promising for routine analysis.

analytical letters

Square Wave Voltammetric (SWV) Determination of Cyanocobalamin (Vitamin B12) in Pharmaceuticals and Supplements on a Carbon Paste Electrode (CPE) Modified by a Manganese(II) Polymeric Film