Resumen:
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A DNA layer adsorbed at glassy carbon electrodes (GCE) was characterized by ellipsometry, atomic force
microscopy (AFM) and scanning electron microscopy (SEM). The presence of the adsorbed DNA layer on polished
glassy carbon electrodes was assessed indirectly by ellipsometric measurements. Ellipsometry was also useful to
evaluate the influence of the oxide layer formed on glassy carbon electrodes, either spontaneously or after
electrochemical pretreatments, on the DNA adsorption and further electrooxidation process. SEM and AFM images
of the electrode surface covered by a thick layer of DNA reveal a nonuniform distribution, leaving channels and
islands of the biological material.