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Evaluation of the physico-chemical properties of chitosan as a potential carrier for rifampicin, using voltammetric and spectrophotometric techniques

2008; Elsevier BV; Volume: 72; Issue: 2 Linguagem: Inglês

10.1016/j.bioelechem.2008.01.003

1878-562X

Renê Humberto Tavares Santos, Neemias G. Santos, José do Patrocínio Hora Alves, Carlos Alexandre Borges Garcia, Luciane Pimenta Cruz Romão, Maria Lara P. M. Arguelho,

Lipid Membrane Structure and Behavior

Rifampicin is an antibiotic which, on a carbon paste electrode, shows an oxidation response of 0.492 V (vs. Ag/AgCl) at pH 7.0, due to the electroactivity of the hydroquinone group. Interaction of rifampicin with chitosan is strongly dependent on pH, species concentrations and contact time between the latter. Compared to the carbon paste electrode, electrodes modified with chitosan showed greater sensitivity, with optimum voltammetric profile obtained at pH 8.0. Spectrophotometric measurements indicate that rifampicin is strongly absorbed by chitosan at pH less than the pKa of the pharmaceutical, such behaviour being favourable for the use of chitosan as a carrier for the controlled release of rifampicin in the intestinal tract.