Odor thresholds of 46 pyrazines in water were investigated. Pyrazines examined were 15 alkylpyrazines, 1 phenylpyrazine, 10 alkoxypyrazines, 6 phenoxypyrazines, 3 phenylthiopyrazines, and 11 alkylthiopyrazines. Alkoxypyrazine exhibited the lowest odor threshold among the pyrazine derivatives tested. Odor thresholds of the pyrazines varied from 0.00001 ppm [2‐methoxy‐3‐methyl‐5‐(2‐methylbutyl)pyrazine] to 6.00 ppm (5‐isopentyl‐2,3‐dimethyl‐pyrazine).
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Takayuki Shibamoto (1986) studied this question.
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