The study of the inclusion complexes formed by ascorbic acid with beta-cyclodextrin at different pH is reported. Special attention is paid to the electrochemical behaviour of ascorbic acid in the presence of the macrocycle on gold electrodes. The modifications observed can be explained by the decrease in the diffusion coefficient of the complex and the presence of an additional chemical step, the dissociation of the complex prior to the electron transfer steps, The inclusion of ascorbic acid in beta-cyclodextrin increases the stability of the guest molecule to oxidising agents. Adsorption of beta-cyclodextrin on gold is also detected, depending on the pH. No effect of ascorbic acid behaviour owing to the addition of alpha-cyclodextrin was observed.