Abstract
Mustard oil is the most commonly adulterated edible oil, invariably with argemone oil. This study was aimed to develop a parallel plate capacitive sensor for measurement of dielectric properties of pure mustard oil, pure argemone oil and their blends (25, 50 and 75%) at five levels of varying temperature (10 to 50 °C). The effect of blend ratio and temperature on the selected dielectric properties of oil—capacitance (C), dielectric loss tangent (tanδ), dielectric constant (\(\varepsilon^{\prime }\)), dielectric loss factor (\(\varepsilon^{\prime \prime }\)) and electrical conductivity (σ) were investigated. It was observed that composition of the individual oils in terms of moisture and fatty acids influenced the physical and dielectric properties. The sensor was used to relate the dielectric properties of oil samples with blend ratio and temperature by means of statistically significant (p < 0.05) and robust (R2 > 0.8) multiple linear regression model. The effect of temperature on C and \(\varepsilon^{\prime }\) was negative, while it was otherwise for tanδ, \(\varepsilon^{\prime \prime }\) and σ. Increase in argemone oil content in the blends, increased the dielectric measures due to the associated changes in the physical and chemical properties. The capacitive sensor could distinctly identify mustard oil, argemone oil and its blends on the basis of dielectric properties.
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Acknowledgements
The authors wish to thank the laboratory staff of Engineering Properties Laboratory for their help during the experimentation. Gratitude is also expressed for Director, ICAR-Central Institute of Agricultural Engineering, Bhopal, India for providing all the logistics.
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This research work has been funded by Indian Council of Agricultural Research, New Delhi.
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AS was responsible for conducting the experiments, collection of data and preparation of the manuscript, SKC conceptualized the research work, provided the logistics and edited the manuscript, AK helped with data analysis and preparation of the manuscript.
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Sudhakar, A., Chakraborty, S.K. & Kate, A. Understanding the variations in dielectric properties of mustard (Brassica nigra L.) and argemone (Argemone mexicana) oil blends at different temperatures. J Food Sci Technol 60, 643–653 (2023). https://doi.org/10.1007/s13197-022-05649-0
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DOI: https://doi.org/10.1007/s13197-022-05649-0