Abstract
This work sought to identify the influence of roasting on lipid oxidation-derived volatile compounds in fragrant rapeseed oils (FROs) via gas chromatography-mass spectrometry and gas chromatography-ion mobility spectrometry. Seven volatiles could be regard as aroma-active compounds by application of odor activity value (OAV≥1) calculation, and caused fatty-like, nutty-like, and green-like notes. After 60min of roasting, the OAVs of hexanal, octanal, (E,E)-2,4-heptadienal, and nonanal in FROs were greater than 3. The same compounds, including hexanal, (E,E)-2,4-heptadienal, nonanal, 1-octanol, and nonanoic acid were also detected in the model systems of lipid oxidation. Notably, the values of p-anisidine, conjugated dienes, and conjugated trienes increased significantly (p<0.05). Furthermore, correlation analysis showed that hexanal, (E,E)-2,4-heptadienal, and nonanal have a significant positive correlation with the oxidative degree of FROs (R=0.70-0.94, p<0.05). Thus, the three above-mentioned aldehydes could serve as important markers for FRO quality during roasting.
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