Hashim and Chaveron  and Cros and Jeanjean  have suggested that during the drying of fermented cocoa beans, reducing sugars participate in non-enzymatic browning reactions (Maillard reactions) to form volatile fractions of pyrazines
Previously, identification of 2,5dm3vp had not been possible, as compared to the other pyrazine
, its quantity was very small (Robledo 2008).
We estimated the expected chemical shifts for carbon atoms arising from the pyrazine
end group on the basis of literature data for similar structure as well as from empirical calculations (32).
According to the data in Table 1, terpene and pyrazine
compound content in Chinese liquor is much higher than wine, but polyphones content in wine is higher.
The levels of pyrazine
, responsible for roasted or chocolate notes, significantly decreased after product storage at ambient and high relative humidity.
Nitrogen-containing compounds are ordered according to chain length and, within these groups, into amines, amides, nitro compounds, nitriles, oximes, esters, and cyclic compounds, including indole, imidazole, pyrazine
, pyrazole, pyridine, and triazine.
Incorporation of a pyrazine
ring as the central unit is now being investigated with anticipation of attaching vinyl pyridyl substituents at the 2,3,5 and 6 positions.
To continue their research, the scientists purchased the two common chemicals and synthesized a stock of the pyrazine
The Adsorption of Pyrazine
on Au(210): SERS intensity is greatest when the scattering occurs from a toughened surface.
Isopentenal, furfural, methyl pyrazine
, furan methanol and acetyl furan.
1996); and 2,3-butanediol, acetic acid, benzene acetaldehyde and pyrazine
2,6-dimethyl, maltol, pyrazines
, 1-octen-3-ol which were described as the major odor--active compounds in fermented soybean (Lee and Ahn, 2009; Zhao et al.
Status Solidi B 2010, 247, 671) investigates the low-frequency spin dynamics and quantum critical behavior in the isotropic S=1/2 antiferromagnetic Heisenberg chain system copper pyrazine