ANALYSIS OF THE COMPLEX ELECTRICAL CONDUCTIVITY OF PORCINE LIVER TISSUE

Abstract

In the present study, the frequency dependence of the electrical conductivity of porcine liver tissue subjected to different
storage conditions—natural aging, cooling, heating, and γ-irradiation—was analyzed. To model the spectral characteristics,
the generalized Cole–Cole model with two dispersions (α and β) and a direct current conductivity component was employed.
Parameter optimization was performed using the differential evolution method. The results demonstrated that the model
provides a high degree of agreement with the experimental data over a wide frequency range (0.01 Hz – 1 MHz). The smallest
changes in electrical properties were observed in samples stored at +5 °C, while the most pronounced alterations occurred after
heating and prolonged exposure to air. High values of the α parameter indicate a polydisperse nature of the relaxation processes
in the studied tissues. The findings confirm the effectiveness of the Cole–Cole model for assessing structural changes in
biological samples, opening up prospects for non-invasive diagnostics and biomedical applications.