期刊
MOLECULES
卷 26, 期 21, 页码 -出版社
MDPI
DOI: 10.3390/molecules26216717
关键词
free radical; electron paramagnetic resonance; volatile; lipid oxidation; artificial neural network (ANN)
资金
- Natural Science Foundation of China [32001736]
The study used EPR and GC-MS techniques to analyze the variation of lipid free radicals and oxidized volatile products in four oils during thermal processing. The results showed that linseed oil had the highest signal intensities, while palm oil had the lowest. Furthermore, an artificial neural network model was established to accurately predict the free radicals in thermally oxidized oils.
In this study, electron paramagnetic resonance (EPR) and gas chromatography-mass spectrometry (GC-MS) techniques were applied to reveal the variation of lipid free radicals and oxidized volatile products of four oils in the thermal process. The EPR results showed the signal intensities of linseed oil (LO) were the highest, followed by sunflower oil (SO), rapeseed oil (RO), and palm oil (PO). Moreover, the signal intensities of the four oils increased with heating time. GC-MS results showed that (E)-2-decenal, (E,E)-2,4-decadienal, and 2-undecenal were the main volatile compounds of oxidized oil. Besides, the oxidized PO and LO contained the highest and lowest contents of volatiles, respectively. According to the oil characteristics, an artificial neural network (ANN) intelligent evaluation model of free radicals was established. The coefficients of determination (R2) of ANN models were more than 0.97, and the difference between the true and predicted values was small, which indicated that oil profiles combined with chemometrics can accurately predict the free radical of thermal oxidized oil.
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