High Quality Content by WIKIPEDIA articles! Racker unit = Change of absorbency per minute. E. Racker defined one unit of alcohol dehydrogenase as the amount which causes a change in optical density of 0.001 per minute under the standard conditions of assay. Taken from California State Polytechnic University, Pomona - pg. 23 in Experiments in General Biochemistry Chemistry 321, 327 by Charles E. Bowen. Revised - November, 2005. Alcohol dehydrogenases (ADH) are a group of seven dehydrogenase enzymes that occur in many organisms and facilitate the interconversion between alcohols and aldehydes or ketones with the reduction of NAD+ to NADH. In humans and many other animals, they serve to break down alcohols which could otherwise be toxic; in yeast and many bacteria, some alcohol dehydrogenases catalyze the opposite reaction as part of fermentation.

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