Abstract
This work shows the interaction of dopamine (DA) and ascorbic acid (AA) with β-cyclodextrin (βCD), by means of UV-VIS spectrophotomety and cyclic voltammetry, to demonstrate the formation of inclusion complexes of the species and to determine the values of the formation constants in aqueous media at pH 3.0, also through both methods. For the ascorbic acid-βCD complex (H2AA-βCD) a value of 3.5082 {plus minus} 0.0445 was found, while for the dopamine complex DA-βCD (H3DA+βCD) it was 3.772 {plus minus} 01631. With such values theoretical absorption spectra were generated which fitted quite well to the experimental ones, thus indicating clearly that the constants are reliable.
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