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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.

[German Pyrazin, blend of Pyridin, pyridine and az(o)-, azo-.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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During the cooking process of meat, large quantities of volatile compounds are formed, such as aldehydes, ketones, hydrocarbons, furans, thiazoles, and pyrazines; these compounds directly affect flavor [9,10].
The main compounds eliciting green/ vegetal flavors in wine are alkl-methoxypyrazines (also known as MPs, and often simply referred to as pyrazines), C6 green leaf volatiles (particularly hexanols and hexanals) and some thiols.
Compounds such as alcohols, aldehydes, ketones, organic acids, esters, pyrazines, and phenols, among others, are produced during fermentation, contributing to the final flavor profile of chocolate [2].
In addition, some pyrazines appeared to be important to the nutty aroma of Parmigiano Reggiano.
According to a study by [36], roasted chicory roots contain various compounds like 2-acetylpyrrole, furfural, phenyl acetaldehyde, phenyl acetic acid, vanillin, pyrazines, benzothiazoles, aldehydes, aromatic hydrocarbons, furans, phenols, organic acids, and small quantities of insole alkaloid (fi-carbolines), harmane and norharmane.
Copper and iron ions can act as catalysts in the formation of compounds such as pyrazines and pyridines, which are precursors of heterocyclic compounds (Parihar, Vasundhara & Vijayayaghavan, 1981; Jagerstad, Skog, Arvidsson & Solyakov, 1998).
"What we found," says Hillel Alpert, "is that they added ingredients--particularly pyrazines--that appear to have contributed to the 'smooth' flavor, reducing the harshness of certain cigarettes." Pyrazines are also being added to e-cigarette fluids, his team wrote online June 10 in Tobacco Control.
However, beets contain substances as geosmin and pyrazines which are responsible for the off flavor (ground) in this culture (STINTZING & CARLE, 2004).
Hashim and Chaveron [7] and Cros and Jeanjean [8] 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. Oberparleiter and Ziegleder [9] have confirmed earlier 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.
A group of chemical compounds called methoxypyrazines (just "pyrazines" will do) that occur in this family of red varieties give these wines an herbaceous quality that's magical with the foresty combo of rosemary and fresh horseradish.
The volatile collections from males and the synthetic pyrazines were analysed by a gas chromatography/mass spectrometry detector, according to Robledo and Arzuffi (2012).