Infrared radiation-assisted drying stabilizes rice flavor by modulating volatile composition and lipid metabolism
Miaomiao Ying1, Lisong Huang1, Xihua Ding2
1College of Food Science and Engineering/Collaborative Innovation Center for Modern Grain Circulation and Safety, Key Laboratory of Grains and Oils Quality Control and Processing, Nanjing University of Finance and Economics, Nanjing, Jiangsu 210023, China.
None:
Infrared radiation drying (IRD) was associated with improved rice flavor stability during storage, accompanied by changes in lipid metabolism and volatile formation. IRD-treated samples showed 57% lower accumulation of total volatile compounds than controls. Aldehydes, which constituted 45% of all volatiles and contributed strongly to odor profiles, were reduced by 68%. Gas chromatography-olfactometry-mass spectrometry (GC-O-MS) identified hexanal (OAV = 498) as the main flavor compound. IRD treatment was associated with 49% lower levels of lipid-oxidation volatiles (hexanal and acetic acid) and 32% higher retention of desirable flavor compounds (2-acetyl-1-pyrrolidine, octanal, phenylglyoxal, benzaldehyde). Flavor recombination experiments confirmed the key contribution of hexanal to flavor deterioration. Lipidomics analysis indicated reduced short-chain TG hydrolysis and lower levels of free linoleic and linolenic acid in IRD-treated samples. These findings suggest that IRD-assisted drying treatment contribute to maintaining grain quality during storage.
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