Journal of Applied Toxicology 1988-Feb
Removal of urea from alcoholic beverages with an acid urease.
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Urethan, a cancer causing chemical, was reported to contaminate some alcoholic beverages. Since urethan is formed by heating urea with ethyl-alcohol, removal of urea is necessary to prevent urethan formation in alcoholic beverages. Acid urease, whose optimal pH lies around 4, lowered urea concentrations in Japanese sake. This finding indicates a protective effect of acid urease on urethan's potential hazards in alcohol.