Electrical equivalent circuit of biological objects of vegetable

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The results of measurements of complex biological tissues electrical resistance of vegetable origin are presented. The measurements were performed at T=296 K in the frequency range from 5 to 500 kHz. As the electrodes were covered with tin (purity of 99.9%) copper plates.. Experimentally investigated the following objects: samples parenchymal tissue of Apple in the form of cylinders with a diameter of 20 mm and a length of 20 mm; Apple juice, obtained by mechanical destruction of cells; pressed Apple pulp (juice content of not more than 20%)obtained by the centrifugal separation, which destroyed the system of cells. For plant tissue with a holistic system of cells in the field 10 3 - 10 5 Hz is observed pronounced minimum angle of phase shift. In the absence of cells and its value is greatly reduced.The equivalent electrical circuit fabrics are considered. The calculation of all its elements is made. The equivalent capacitance of the electrical double layer at the interface of metal measuring electrode and extracellular fluid is element of C 1. The electrical resistance of this layer alternating current is characterized by the element R 1. Chain parallel connected resistance and capacitance describes the system of plant cells. The capacitance C 2 is due to the electrical capacity of the cell membranes, and the resistance R 2 is the electrical resistance of the membranes and intracellular space.The coincidence of experimental and calculated data in a frequency range of more than 10 3 Hz satisfactory. In the region of lower frequencies is observed differences. This may be due to the specific behavior of the electrical double layer. However, in the frequency region where the electrical properties of the cell structure of the investigated tissue match good, which proves the validity of the considered equivalent circuit. It is shown that the value of the complex electrical impedance of vegetable tissue in the frequency range from 10 3 Hz to 10 5 allows receiving the cell structure electrical parameters: the characteristic frequency, the electric resistance and capacitance. In practice, these parameters can be used to identify the product and evaluate the influence degree of various external factors on its quality


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IDR: 14040318

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