{Reference Type}: Comparative Study
{Title}: Key volatile off-flavor compounds in peas (Pisum sativum L.) and their relations with the endogenous precursors and enzymes using soybean (Glycine max) as a reference.
{Author}: Zhang C;Hua Y;Li X;Kong X;Chen Y;
{Journal}: Food Chem
{Volume}: 333
{Issue}: 0
{Year}: Dec 2020 15
{Factor}: 9.231
{DOI}: 10.1016/j.foodchem.2020.127469
{Abstract}: The dominant volatile off-flavor compounds of pea and soy milk were investigated by gas chromatography-olfactometry-mass spectrometry (GC-O-MS), sensory evaluation, and odor-activity values (OAVs), which led to the identification of their differences. We identified 11 aroma compounds as important odorants with OAVs greater than 1 in pea and soy milk. OAVs contribution rate demonstrated that 6 compounds contributed most to the characteristic off-flavor of pea milk, among which 2-methoxy-3-isopropyl-(5 or 6)-methyl pyrazine, hexanal, (E,E)-2,4-nonadienal, and (E,E)-2,4-decadienal contributed more than others. For soy milk, 1-octen-3-one, hexanal, (E,E)-2,4-nonadienal, and (E,E)-2,4-decadienal showed more important contributions. These odor-active compounds were divided into non-lipoxygenase (non-LOX) and LOX pathways based on their synthesis. Several endogenous enzymes that are important to the LOX pathway were identified by liquid chromatography tandem mass spectrometry (LC-MS/MS), and the contents of key off-flavor compounds were found to be related to the enzyme activities, while the lipid content was not an important factor.