pyrazine

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pyrazine

(pĭr′ə-zēn′)
n.
1. A crystalline organic base, C4H4N2, having a six-member aromatic ring in which the first and fourth atoms are nitrogen and the rest are carbon.
2. Any of a group of compounds derived from or structurally related to this base. Pyrazines occur in pteridines, some vitamins, and certain dyes such as phenazine.
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A total of 31 volatile compounds, including aldehydes, hydrocarbons, ketones, pyrazines, alcohols, and terpenes, were detected in the LT of the three cattle breeds (Table 3).
reactions (Maillard reactions) to form volatile fractions of pyrazines. Oberparleiter and Ziegleder [9] confirmed these findings by Hashim and Chaveron [7] and Cros and Jeanjean [8] by identifying Amadori compounds, the first intermediates of Maillard reaction in dried, unroasted cocoa beans.
The percentages of attraction to the source caused by each pyrazine were similar to those caused by the male volatile collections; however, only a blend of these pyrazines resulted in a similar percentage of landings on the source; both presented significantly different results to those obtained with 2,6mv p and 2,5dm3vp ([chi square] = 23.386, gf:1,p < 0.001 and [chi square] = 12.6, gf:1,p < 0.001, respectively; Fig.
Khidre, "Production of pyrans , pyridazines , pyrimidines , pyrazines and triazine compounds using benzoylacetonitriles as a precursor," Journal of the Iranian Chemical Society, vol.
Pyrazines and its derivatives play an important role in the drug discovery realm.
Pyrazines as warning odour components in the Monarch butterfly, Danaus plexippus, and in the moths of the genera Zygaena and Amata (Lepidoptera).
Different modifications in lactose due to series of reactions result in brown pigmented products such as pyrazines and melanoidins, some polymerized molecules (lactuloselysine & fructoselysine) and small acid molecules are also formed during the Maillard reaction (Fox & McSweeney, 1998; Van Boekel, 1998).
Treatt offers over 300 speciality chemical top notes, including pyrazines, thiazoles and other sulphur, nitrogen and oxygen heterocyclic chemicals, manufactured by Endeavour Specialty Chemicals.
Formation of Strecker aldehydes and pyrazines in a fried potato model system.
Additionally, Treattazine contains a variety of other natural odiferous molecules and methoxy pyrazines. Colorless to pale yellow, the specialty is both oil and ethanol soluble, and free from solvents or additives.
The second-largest group, the pyrazines, contribute to the toasted flavours.