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J Agric Food Chem

Title:		Characterization of the Major Odor-Active Off-Flavor Compounds in Normal and Lipoxygenase-Lacking Soy Protein Isolates by Sensory-Directed Flavor Analysis
Author(s):		Li X; Zhang W; Zeng X; Xi Y; Li Y; Hui B; Li J;
Address:		"Key Laboratory of Green and Low-Carbon Processing Technology for Plant-Based Food of China National Light Industry Council, School of Food and Health, Beijing Technology and Business University, Beijing 100048, P. R. China"
Journal Title:		J Agric Food Chem
Year:		2023
Volume:		20230518
Issue:		21
Page Number:		8129 - 8139
DOI:		10.1021/acs.jafc.3c00793
ISSN/ISBN:		1520-5118 (Electronic) 0021-8561 (Linking)
Abstract:		"The major off-flavor odorants of normal (NOR) and lipoxygenase-lacking (LOX-lack) soy protein isolates (SPIs) were discriminated by sensory-directed flavor analysis. A total of 32 odor-active off-flavor compounds were detected in SPIs, and 19 of them with flavor dilution (FD) factors ranging from 3 to 2187 were quantified by external standard curves. It was found that hexanal and nonanal dominated in the off-flavor profile of SPIs regarding their odor activity values (OAVs) and FD contributions, followed by octanal, 1-hexanol, 1-octen-3-ol, 2-heptone, and benzaldehyde. To further improve the precision of quantification, the above 7 major odor-active off-flavor compounds were requantified by stable isotope dilution assays (SIDA) for the first time. The results suggested that the sensory differences between NOR and LOX-lack SPIs could be mainly due to the reduced C6/C9 aldehydes and alcohols rather than 1-octen-3-ol and benzaldehyde. Finally, these differential compounds were further verified by the spiking experiment"
Keywords:		*Odorants/analysis Soybean Proteins Benzaldehydes Gas Chromatography-Mass Spectrometry Lipoxygenase *Volatile Organic Compounds/analysis Flavoring Agents aroma dilution analysis lipoxygenase-lacking odor-active off-flavor compounds soy protein isolate sta;
Notes:		"MedlineLi, Xuejie Zhang, Wentao Zeng, Xiangquan Xi, Yu Li, Yan Hui, Bowen Li, Jian eng 2023/05/18 J Agric Food Chem. 2023 May 31; 71(21):8129-8139. doi: 10.1021/acs.jafc.3c00793. Epub 2023 May 18"