Experimental ternary mutual diffusion coefficients (D-11, D-22, D-12 and D-21, obtained by the Taylor dispersion method, are reported for aqueous solutions of levodopa (L-dopa) + beta-cyclodextrin (beta-CD) solutions at 310.15 K and concentrations up to 0.007 mol dm(-3). Comparison of these experimental results with data predicted by a model of the diffusion that includes inclusion complexes, it is possible to conclude that the association equilibrium at 310.15 K has little effect on the diffusion properties. Support for this comes from H-1 NMR spectroscopy, which shows that there are no interactions, which may be related to the reduced L-dopa/cavity interactions resulting from both the amine and carboxylate groups on L-dopa being charged. (C) 2017 Elsevier Ltd.