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Mechanisms of lipid oxidation and volatile development in superheated steam treated buckwheat during accelerated
Yongqiang Liang1, Rongjie Wen1, Nuo Wang1
1Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, School of Life Science, Shanxi University, Taiyuan 030006, China.
Abstract:
This study systematically investigated the effects of superheated steam (SS) on lipid oxidation and volatile compound development in buckwheat during accelerated storage. SS treatment at 150 °C, 170 °C, and 190 °C significantly reduced lipase activity by 97.05-97.73% and lipoxygenase activity by 75.21-80.77%, while completely inactivating peroxidase in buckwheat. During accelerated storage, compared with untreated buckwheat, SS treatment initially increased and subsequently decreased the peroxide value, while inhibiting the accumulation of free fatty acids. Screening of key volatiles and lipids combined with machine learning analysis, revealed that SS treatment inhibited the hydrolysis and enzymatic oxidation of triacylglycerol, diacylglycerol, and phosphatidylcholine during accelerated storage. By contrast, SS treatment increased the autoxidation of these lipids under the same conditions. Moreover, 2-hydroxy-benzaldehyde and hexanal were identified as key secondary products of lipid enzymatic oxidation and autoxidation during accelerated storage.
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