At what approximate concentration levels must some essential flavor compounds be present to be effective, often measured in trace amounts?
Answer
Parts per billion (ppb) or parts per trillion (ppt)
A crucial concept is the odor threshold, where a vital chemical compound may only be effective when present in concentrations as low as parts per billion or even parts per trillion. Exceeding these trace amounts can easily turn a desired note into an undesirable off-flavor.
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