Dielectric study of two medicinal oils: Castor oil and wheat oil

The present paper deals with the dielectric study (dielectric constant, dielectric loss) of two medicinal oils, castor oil and wheat oil and their binary mixtures at different temperatures and frequencies. HP 4194A impedance gain/phase analyzer and temperature controller (Julabo, model number F-25, microprocessor controlled) were used to determine dielectric parameters and maintain the temperature of pure oils and their binary mixtures. The dielectric constant and dielectric loss of pure castor oil and wheat germ oil and their binary mixtures have been found to decrease with an increase in both frequency and temperature, except for sample 4. Adding more wheat germ oil to castor oil usually results in a decrease in the dielectric constant and dielectric loss, but not in the case of sample 4. The abnormal behaviour of sample 4 may be due to the formation of strong dipoles due to multiple types of glycerol and fatty acids.