Abstract: The present invention provides a method of producing vinegar of stable quality with no musty odor by applying alcoholic fermentation to cereal not undergoing heat denaturation while controlling the amount of soluble nitrogen in alcohol MOROMI by adding an enzyme preparation composed of glucoamylase and yeast, subjecting it to solid/liquid separation and then conducting acetic acid fermentation directly the separated solution containing alcohol as the starting material.
Abstract: The present invention is based on the finding that peculiar odors in rice vinegar are derived from organic acids and nitrogen derivatives, etc. formed upon production and it concerns a process for producing rice vinegar of enriched flavor, wherein the amount of peculiar odor-forming organic acids formed in the production step of the rice vinegar is as little as possible and a treatment for removing nitrogen compounds is applied and gluconic acid is added.
Abstract: A process for producing vinegar is disclosed wherein cereals or fruits are subjected to alcoholic fermentation thereby resulting in an alcohol fermentation product which is subsequently purified by ultra-filtration membranes to obtain purified alcohol. The purified alcohol is subjected to acetic acid fermentation and vinegar is recovered therefrom.