1
کشاورزی::
دی متیل پیرازین
The simple unsubstituted or monosubstituted pyrazines have a roasted, bis- cuity aroma and relatively high aroma thresholds, but as the substitution increases, the odour threshold decreases. 2-Ethyl-3,6-dimethylpyrazine (50), for example, has a potatoey, woody, earthy aroma and a threshold of 0.4 痢/kg (Karahadian and
Johnson, 1993), whereas the 2-ethyl-3,5-dimethylpyrazine has a sweeter, more choc- olate character (1 痢/kg) and 2,3-diethyl-5-methylpyrazine has a roasty potato note. 2- Ethyl-3,6-dimethylpyrazine (50) (earthy) and 2,3-diethyl-5-methylpyrazine (potato
This is illustrated in Figure 8.6, route 1, showing the formation of 2,3-dimethylpyrazine directly from glyoxal and 2,3-butanedione.
C and concluded that 2,5-dimethylpyrazine and 2-
Fraction Pyrazines C2 fraction 2,5-Dimethylpyrazine 2,6-Dimethylpyrazine 2,3-Dimethylpyrazine 2-Ethylpyrazine C3 fraction 2-Ethyl-6-methylpyrazine 2-Ethyl-5-methylpyrazine 2-Ethyl-3-methylpyrazine 2,3,5-Trimethylpyrazine C4 fraction 2-Ethyl-3,6-dimethylpyrazine 2-Ethyl-5,6-dimethylpyrazine 2-Ethyl-3,5-dimethylpyrazine 2,5-Diethylpyrazine C5 fraction 2,3-Diethyl-5-methylpyrazine 3,5-Diethyl-2-methylpyrazine 2,5-Diethyl-3-methylpyrazine 2-Ethyl-3,5,6-trimethylpyrazine
واژگان شبکه مترجمین ایران