372 5 Aroma Compounds
Table 5.24.Pyrazines in food
Structure Substituent Aroma Odor threshold value
quality (μg/l; water)
Trimethyl- Earthy 90
2-Ethyl-3,5-dimethyl- Earthy, roasted 0. 04
2-Ethenyl-3,5-dimethyl- Earthy, roasted 0. 1
2-Ethyl-3,6-dimethyl- Earthy, roasted 9
2,3-Diethyl-5-methyl- Earthy, roasted 0. 09
2-Ethenyl-3-ethyl-5-methyl- Earthy, roasted 0. 1
Acetyl- Roasted corn 62
2-Isopropyl-3-methoxy- Potatoes 0. 002
2-sec-Butyl-3-methoxy- Earthy 0. 001
2-Isobutyl-3-methoxy- Hot paprika (red pepper) 0. 002