In the
alcoholic beverage
Drinks containing alcohol (drug), alcohol are typically divided into three classes—beers, wines, and Distilled beverage, spirits—with alcohol content typically between 3% and 50%. Drinks with less than 0.5% are sometimes considered Non-al ...
s industry, congeners are substances produced during
fermentation
Fermentation is a type of anaerobic metabolism which harnesses the redox potential of the reactants to make adenosine triphosphate (ATP) and organic end products. Organic molecules, such as glucose or other sugars, are catabolized and reduce ...
other than the desired type of
alcohol
Alcohol may refer to:
Common uses
* Alcohol (chemistry), a class of compounds
* Ethanol, one of several alcohols, commonly known as alcohol in everyday life
** Alcohol (drug), intoxicant found in alcoholic beverages
** Alcoholic beverage, an alco ...
(
ethanol
Ethanol (also called ethyl alcohol, grain alcohol, drinking alcohol, or simply alcohol) is an organic compound with the chemical formula . It is an Alcohol (chemistry), alcohol, with its formula also written as , or EtOH, where Et is the ps ...
). These substances include small amounts of chemicals such as
methanol and other alcohols (known as
fusel alcohols),
acetone
Acetone (2-propanone or dimethyl ketone) is an organic compound with the chemical formula, formula . It is the simplest and smallest ketone (). It is a colorless, highly Volatile organic compound, volatile, and flammable liquid with a charact ...
,
acetaldehyde,
esters
In chemistry, an ester is a chemical compound, compound derived from an acid (either organic or inorganic) in which the hydrogen atom (H) of at least one acidic hydroxyl group () of that acid is replaced by an organyl group (R). These compounds c ...
,
tannin
Tannins (or tannoids) are a class of astringent, polyphenolic biomolecules that bind to and Precipitation (chemistry), precipitate proteins and various other organic compounds including amino acids and alkaloids. The term ''tannin'' is widel ...
s, and
aldehydes (e.g.
furfural). Congeners are responsible for most of the
taste
The gustatory system or sense of taste is the sensory system that is partially responsible for the perception of taste. Taste is the perception stimulated when a substance in the mouth biochemistry, reacts chemically with taste receptor cells l ...
and
aroma of distilled alcoholic beverages, and contribute to the taste of non-distilled drinks.
Brandy
Brandy is a liquor produced by distilling wine. Brandy generally contains 35–60% alcohol by volume (70–120 US proof) and is typically consumed as an after-dinner digestif. Some brandies are aged in wooden casks. Others are coloured ...
,
rum and
red wine have the highest amount of congeners, while
vodka
Vodka ( ; is a clear distilled beverage, distilled alcoholic beverage. Its varieties originated in Poland and Russia. Vodka is composed mainly of water and ethanol but sometimes with traces of impurities and flavourings. Traditionally, it is ...
and beer have the least.
Congeners are the basis of
alcohol congener analysis, a sub-discipline of
forensic toxicology which determines what a person drank.
There is some evidence that high-congener drinks induce more severe
hangover
A hangover is the experience of various unpleasant physiological and psychological effects usually following the consumption of alcohol (beverage), alcohol, such as wine, beer, and liquor. Hangovers can last for several hours or for more than ...
s,
but the effect is not well studied and is still secondary to the total amount of ethanol consumed.
Toxic congeners
Fusel alcohols
Methanol
Although
methanol is not produced in toxic amounts by fermentation of sugars from grain starches, it is a major occurrence in
fruit spirits. However, in modern times, reducing methanol with the absorption of a
molecular sieve is a practical method for production.
See also
*
Alcohol (drug)
Alcohol, sometimes referred to by the chemical name ethanol, is the active ingredient in alcoholic drinks such as beer, wine, and distilled spirits (hard liquor). Alcohol is a central nervous system (CNS) depressant, decreasing Action potent ...
*
Alcohol congener analysis
*
Wine chemistry
References
External links
Relationships of Sweetness in Lager to Selected Volatile Congeners
Alcohol chemistry
Taste modifiers
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