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In this study the electrochemical behavior of metformin (MET), oral antihyperglycaemic agent, was assayed at three different electrodes. The drug standard was investigated by cyclic voltammetry and square wave volta­mmetry via its electrooxidation at Au and glassy carbon electrode in 0.05 M NaHCO3. Under these conditions transformation of MET to corres­ponding N -carbonyl guanidine via oxime intermediate is suggested. The sta­bi­lity of MET was tested under directed stress conditions using IrO x elec­trode with sodium sulphate as an electrolyte and cyclic 4-amino-2-imino-1-me­thyl-1,2-dihydro-1,3,5-triazine appeared as the main end-product. The courses of the electrochemical pro­cesses at three electrodes were followed by UV spectro­scopy and evaluated by total organic carbon analysis.

Electrochemical stability of metformin in NaHCO3 and Na2SO4 water solution at Au, GC and IrOx electrodes