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Fusel oil - a byproduct of alcoholic fermentation , contained as an impurity in ethanol ( alcohol production ) , resulted by fermentation and released in the process of rectification.

Fusel oil is an oily liquid with a pungent unpleasant odor from light yellow to reddish- brown in color and with a density of 0,***0,*4 g/cm3 (*0 ° C). Composition and properties vary depending on the raw fermentation modes and selecting the fractions under fractionation , distillation yield in raw alcohol - 0.**0.7 %. Main component is monohydric saturated alcohols, C*-C9, of which the main component is isoamyl alcohol in the composition also comprises isobutyl alcohol and propyl alcohol in small amounts of higher alcohols and aliphatic aldehydes , fatty acids , and furfural . Saturated aldehydes and alcohols are food yeasts metabolize amino acids that undergo oxidative deamination to form an α- keto acid , which then decarboxylated to aldehydes , which in turn are reduced to alcohols : RCH (NH2) COOH RCOCOOH RCHO RCH2OH Thus from leucine and isoleucine formed isomeric amyl alcohols and of valine - isobutanol . Fusel oil is also present in the beer ( 0.***0.*5 %).