23.  A New Mode of Classifying the Medicaments by Using the Electrochemical Impedance Spectroscopy

Authors: N. Bonciocat, A. Cotarta


Abstract:

In this paper an “Electrochemical Impedance Spectroscopy (E I S)” method has been elaborated for classifying the medicaments (especialy those from the God pharmacy) with respect to their capacitive and inductive properties. The method uses the following reference dielectrode: Pt | [Fe(CN)6]3- / [Fe(CN)6]4-, KCl (in excess), O2 physically dissolved. The medicament is introduce in the electrolytic solution of this reference dielectrode, and the Nyquist plots are recorded according to a schedule described in the paper. Unlike Warburg, we have considered that the interface has both capacitive and inductive properties. Consequently, we have substituted the Warburg pseudo-capacitance CW , either by a pseudo-capacitance CW* put in series with a pseudo-inductance LW*, or by a pseudo-capacitance CW** put in parallel with a pseudo-inductance LW**. In this way, it was possible to propose a criterion which permits to compare the inductive properties of two medicaments, and therefore to classify the medicaments with respect to a reference medicament (e.g. the Sweedish Bitter).


Keywords: Electrochemical Impedance Spectroscopy, pseudo-capacitance, cyclic voltammetry

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