Cobalt and iron tetrasulfonated phthalocyanines (M-TSPc) have been studied by electroreflectance spectro!;copy in the adsorbed state on the basal plane of HOPG in a berate buffer (pH 9). Since both complexes exhibit electrocatalytic activity for the electro-oxidation of cysteine, we looked at the changes of the visible spectra of the adsorbed complexes upon adding millimolar amounts of cysteine to the electrolyte. Under zero-current conditions (open circuit) the addition of cysteine causes large changes in the reflectance spectra of both Co-TSPc and Fe-TSPc. In the case of Co-TSPc the spectra resemble that elf Co(I)TSPc whereas for Fe-TSPc bands at 424 and 626 nm are observed. The open circuit potential shifts to values close to the standard potential of the M(II)/M(I) couple. We attribute these changes, particularly in the case of Fe-TSPc, to the formation of a radical adduct between the adsorbed phthalocyanine and the cysteine molecule, with partial electron-transfer from the cysteine to the metal center. Evidences for these adducts is not found when polarizing the electrode, which shows that they behave as very unstable intermediates in the catalytic process.