Abstract

TKACH, Volodymyr V. et al. The theoretical study of the function of conducting polymers of the azo-dyes in the electrochemical detection of indigo-carmine. Rev. colomb. cienc. quim. farm. [online]. 2020, vol.49, n.3, pp.699-709.  Epub Feb 25, 2021. ISSN 0034-7418.  https://doi.org/10.15446/rcciquifa.v49n3.91338.

The function of the conducting polymers of azo-dyes during the indigo-carmine electrochemical detection has been investigated from the theoretical point of view. The correspondent model has been described and analyzed by means of linear stability theory and bifurcation analysis. It has been shown that the electroanalytical system depends strongly on pH, as the excessive protons concentrations drive the system to the electroanalytical inefficiency, as they block the reaction active sites. Nevertheless, despite of the mentioned, the azo-dyes conducting polymers are efficient modifiers for indigo-carmine electrochemical determination. The possibility of oscillatory and monotonic instabilities has also been verified.

Keywords : Conducting polymers; electrochemical sensors; indigo-carmine; food dyes; azo-dyes; stable steady-state.

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