Interrelationship between electrical conductivity, refractive index and viscosity of honey
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Date
2019
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Punjab Agricultural University, Ludhiana
Abstract
The present work has been undertaken to make a systematic study of the physicochemical parameters of raw honey like electrical conductivity, refractive index and viscosity to establish an interrelationship between them. This interrelationship will help to determine the refractive index and viscosity from electrical conductivity values of honey. All the measurements were taken at different temperatures (20, 30, 40, 50, 60, 70˚C) and concentrations (100, 90, 80, 70, 60 and 50%). The electrical conductivity increased linearly both with temperature and upon dilution. The refractive index decreased linearly with temperature and was found to increase linearly with concentration of honey. The viscosity of honey decreased exponentially both with the increase of temperature and with decrease of concentration. The Arrhenius mathematical model was applied to establish the temperature dependence of honey viscosity and thus used for the determination of its activation energy. The honey with highest viscosity values displayed the highest value for activation energy. The temperature-coefficient of refractive index (thermo-optic coefficient) was found to be same for all the concentrations. The data obtained were statistically analysed using one-way analysis of variance (ANOVA) at 5% level of significance. The studied parameters were found to vary significantly with temperature for all honey concentrations. The equations modelling the relationship of electrical conductivity with viscosity and refractive index values of honey were obtained. The regression equations were found to have high correlation coefficients (> 0.93).
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