You are using an old browser that may not function as expected.
For a better, safer browsing experience, please upgrade your browser.

Log in Become a Member


Abbreviation for alcohol dehydrogenases. These are enzymes found in the human liver (and also in the digestive tract) which, in the presence of the co-enzyme NAD (nicotinamide adenine dinucleotide, which acts as a hydrogen carrier), breaks down alcohol and oxidises it to acetaldehyde. This is then detoxified to biologically activated acetic acid with the help of the enzyme ALDH (aldehyde dehydrogenase) and finally converted to carbon dioxide and water, which normally keeps the concentration of free acetaldehyde in the body very low. Among East Asians, the indigenous peoples of America (Indians) and the Aborigines of Australia, ALDH is inactive in about 80% of cases, therefore these ethnic groups tolerate only small amounts of alcohol. In Europeans, this alcohol intolerance occurs in only about 5% of the population.

Voices of our members

Thorsten Rahn

The Wine lexicon helps me to stay up to date and refresh my knowledge. Thank you for this Lexicon that will never end in terms of topicality! That's what makes it so exciting to visit more often.

Thorsten Rahn
Restaurantleiter, Sommelier, Weindozent und Autor; Dresden

The world's largest Lexicon of wine terms.

26,117 Keywords · 46,878 Synonyms · 5,323 Translations · 31,451 Pronunciations · 188,319 Cross-references
made with by our author Norbert F. J. Tischelmayer. About the Lexicon