Autori: V.C.Diculescu, S. Khumbat, A.M. Oliveira Brett

Editorial: Analytica Chimca Acta, 2006.

Rezumat:

The electrochemical behavior of isatin – a molecule with a broad range of applications in synthetic, biological and clinical activity – has been
investigated over a wide pH range at a glassy carbon electrode (GCE) using cyclic, square wave and differential pulse voltammetry. The oxidation
of isatin is an irreversible process, pH dependent and occurs with the formation of a main oxidation product that strongly adsorbs on the electrode
surface. The reduction of isatin is also a pH dependent irreversible process. Cyclic voltammograms show two consecutive charge transfer reactions.
The diffusion coefficient of isatin was calculated in pH 7.0 phosphate buffer to be D0 = 4.9×10−7 cm2 s−1. The limit of detection obtained in a
solution of pH 7.0 phosphate buffer was LoD = 0.194
M, based on three times the noise level.

Cuvinte cheie: Isatin; Indole; Oxidation; Reduction; Voltammetry