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Published on: May 29, 2018
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Prediction of oxidative stability in bulk oils using dielectric constant changes
YunSik Woo1, Mi-Ja Kim2, JaeHwan Lee1
1Department of Food Science and Biotechnology, Sungkyunkwan University, Suwon, Republic of Korea.
Food Chemistry
|January 7, 2019
Summary
The dielectric constant of edible oils can predict oxidative stability. Higher dielectric constants indicate lower stability, influenced by amphiphilic compounds, moisture, and fatty acid unsaturation.
Area of Science:
- Food Science
- Analytical Chemistry
- Materials Science
Background:
- Dielectric constant is a key physical property of oils.
- Understanding factors influencing dielectric constant is crucial for quality assessment.
- Oxidative stability is a critical parameter for edible oil shelf-life and safety.
Purpose of the Study:
- To determine the effect of amphiphilic compounds on the dielectric constant of bulk oils.
- To evaluate the dielectric constant as a predictor of edible oil oxidative stability.
Main Methods:
- Measurement of dielectric constants in bulk oils with varying compositions.
- Correlation analysis between dielectric constant and oxidative stability indicators.
- Analysis of the influence of monoacylglycerols, lecithin, free fatty acids, and moisture.
Main Results:
- Dielectric constant increased with monoacylglycerols, lecithin, and moisture content.
- Dielectric constant decreased with the addition of free fatty acids (oleic, linoleic).
- A strong correlation was observed between dielectric constant and unsaturated fatty acid content; higher dielectric constants correlated with lower oxidative stability.
Conclusions:
- Dielectric constant is a reliable indicator for predicting the oxidative stability of edible oils.
- Amphiphilic compounds, moisture, and fatty acid unsaturation significantly influence oil dielectric properties.
- This research provides a foundation for non-destructive quality assessment of edible oils.
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