Specific impedance of canine blood

Abstract

The specific impedance of canine erythrocytes suspended in plasma was measured in the frequency range from 5 kHz to 1 MHz in samples from three animals in the hematocrit range from zero to packed cells at a temperature of 39 degrees C; measurements were made with a conductivity cell using four electrodes and a current density of 21 microA/cm2. With the use of impedance spectroscopy, data were fitted to an equivalent circuit model; model parameters in turn were fitted as functions of hematocrit. The resultant model can be used to predict specific impedance (real and reactive components) as a function of hematocrit and frequency over a frequency range from 5 kHz to 1 MHz and a hematocrit range from 0 to 80. Over a normal range of hematocrits and at frequencies less than 100 kHz, the current is almost exclusively confined to the plasma, and the specific impedance is nearly equal to the real component; however, at higher frequencies, the complex nature of specific impedance becomes important.

Monitoring acid-demineralization of human dentine by electrochemical impedance spectroscopy (EIS)

“…EIS can be used to measure electrical resistance of biological tissues, such as dental tissues, 1-6 bone, 7 skin 8 and, blood cells. 9 Some insulators such as structural ceramics, 10 polymers 11 and other porous materials are good insulators when they are absolutely dry. However, if an electrolyte can penetrate into these materials, they will be conductive.…”

In vitro analysis of ‘smear layer’ on human dentine using ac-impedance spectroscopy

“…An ac-impedance technique has been used to measure the impedance of several biological tissues, including bone, 15 skin, 16 blood cells, 17 corneal endothelium 18 and also used to detect tissue tumours 19 and tooth caries. 20 The aim of the current study was therefore to determine whether ac-impedance spectroscopy can be used to objectively measure removal of the smear layer in vitro.…”

Effects of Lead Exposure on Blood Electrical Impedance Spectroscopy of Mice

“…Blood impedance analysis for RBCs was selected according to cellular structures using previously described methods [41,42] . The impedance of the β dispersion was simulated by a three-element circuit, as shown in Figure 4.…”