VOLTAMMETRIC BEHAVIOR OF THE SCHIFF-BASE OF PYRIDOXAL-5'-PHOSPHATE WITH HEXYLAMINE IN NONAQUEOUS SOLVENTS - ELECTRON-TRANSFER KINETICS

The electrochemical behaviour of the Schiff base of pyridoxal phosphat e with hexylamine have been studied by linear cyclic voltametry in non aqueous solvents. An irreversible cathodic peak was observed for the reduction of the monoprotonated species of the Schiff base. The peak p otential (vs Ferroceno/Ferrocinium couple) varies more than 500 mV in the solvents used in our study. This behaviour suggests that the elect rochemical parameters extracted from the reduction of these compounds as a function of the solvent parameters (polarity, polarizability, aci d-base) could be useful in the characterization of the Schiff base as a probe of the catalytic site of proteins.