Liang, Jingjing published the artcileAroma Constituents in Shanxi Aged Vinegar before and after Aging, Application In Synthesis of 21834-92-4, the main research area is aroma compound aged Shanxi vinegar; GC−O; Shanxi aged vinegar; aroma extract dilution analysis; quantitation; selected reaction monitoring; solvent-assisted flavor evaporation.
Shanxi aged vinegar is one of the most famous Chinese traditional cereal vinegars produced by spontaneous solid-state fermentation However, the aroma composition of Shanxi aged vinegar is still ambiguous. The Shanxi vinegars before and after aging were both analyzed by solvent-assisted flavor evaporation combined with gas chromatog.-mass spectrometry (GC-MS) as well as gas chromatog.-olfactometry (GC-O) in aroma extract dilution anal. A total of 87 odor-active regions were found by GC-O, and 80 odor-active compounds were identified. By GC-MS/MS, in selected reaction monitoring mode, 30 important identifications were quantitated using authentic standards In comparison, the aroma mols. for the vinegars before and after aging were almost the same; only their levels were altered, with mostly the esters and some compounds that produce pungent smells being lost and the levels of those from the Maillard reaction, especially the pyrazines (e.g., tetramethylpyrazine), being greatly increased. As for the aged vinegar, the compounds found to have high flavor dilution factors (>128) were 3-(methylthio)propanal, vanillin, 2,3-butanedione, tetramethylpyrazine, 3-methylbutanoic acid, γ-nonalactone, guaiacol, 3-(methylthio)propyl acetate, di-Me trisulfide, phenylacetaldehyde, 2-ethyl-6-methylpyrazine, 2-acetylpyrazine, 2,3-dimethylpyrazine, furfural, and 3-hydroxy-2-butanone. However, the aroma compounds found at high concentrations (>25 μg/L) in the aged vinegar were acetic acid, followed by 2,3-butanedione, furfural, 3-hydroxy-2-butanone, tetramethylpyrazine, furfuryl alc., and 3-methylbutanoic acid.
Journal of Agricultural and Food Chemistry published new progress about Aging of materials. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Application In Synthesis of 21834-92-4.
Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem