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Revista Colombiana de Ciencias Químico - Farmacéuticas
versão impressa ISSN 0034-7418versão On-line ISSN 1909-6356
Resumo
TKACH, Volodymyr V. et al. The theoretical description for the electroanalytical function of the composite of vanadium oxyhydroxide with the squaraine dye in the carfedon determination. Rev. colomb. cienc. quim. farm. [online]. 2022, vol.51, n.1, pp.458-469. Epub 08-Dez-2023. ISSN 0034-7418. https://doi.org/10.15446/rcciquifa.v51n1.1022727.
Introduction:
In this work, the electroanalytical behavor of the vanadium oxyhydroxide-squaraine dye composite for the carfedon detection is evaluated. The electroanalytical process includes the formation of two tetravalent vanadium forms, including vanadium dioxide and vanadylion.
Methods:
A mechanism, capable to describe the sensor behavior, has been suggested, and the correspondent mathematical model has been developed and analyzed by means of the linear stability theory and bifurcation analysis.
Results:
The model analysis has proved that the linear dependence between the drug concentration and the concentration is firmly maintained in a wide topological parameter region. As for the oscillatory and monotonic instabilities, they may be realized, being caused by strong influences of the chemical and electrochemical stages on double electric layer capacitance.
Conclusions:
The vanadium oxyhydroxide composite with the squaraine dye may serve as an efficient electrode modifier for carfedone determination. The vanadium oxyhydroxide works as an active substance and the dye as a mediator.
Palavras-chave : Carfedone; squaraine dye; vanadium oxyhydroxide; electrochemical sensor; stable steady-state.