acts as a preservative (e.g. propylene glycol), is a vehicle for the flavor, and determines its form of presentation.
Flavors are tested to determine at what concentrations they should be used, and at which they maintain their flavor (Fischetti). The concentration index is the amount of flavor in the final product in parts per million or percent. A character impact item is one that makes a large contribution to a particular flavor and provides most of the flavorÆs organoleptic effect. For example, 1-octen-3-ol is characteristic of mushroom; 4-methylnonenoic acid, 4-methyloct
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