Vinegar is an acid, its main components are acetic acid, higher alcohols.
Vinegar is a sour flavoring agent produced with various leavening, chemical formula: CH?COOH , is a weak electrolyte. Brewing vinegar mainly uses rice or sorghum as raw material.
Appropriate fermentation can use the liquid containing carbohydrates (sugar, starch) into alcohol and carbon dioxide, and the alcohol is then combined with oxygen in the air by some bacteria to produce acetic acid and water. Therefore, the process of making vinegar is the process of further oxidizing alcohol into acetic acid.
Expanded information:
Making method:
(1)Traditional Chinese vinegar making Raw materials, south of the Yangtze River to glutinous rice and rice (japonica), north of the Yangtze River to sorghum and millet. Now more broken rice, corn, sweet potato, sweet potato, dried sweet potato, potato, dried potato and other substitutes.
The raw materials are first steamed, pasted, liquefied and saccharified, so that the starch is converted into sugar, and then yeast to make the fermentation to generate ethanol, and then under the action of acetic acid bacteria to make acetic acid fermentation, the oxidation of ethanol to generate acetic acid.
(2) make vinegar with sugary raw materials, can use grapes, apples, pears, peaches, persimmons, jujubes, tomatoes, etc. to make all kinds of fruit juice vinegar, also can use honey and molasses as raw materials. They all need only two biochemical stages of ethanol fermentation and acetic acid fermentation.
(3) ethanol as raw material, plus acetic acid bacteria only by acetic acid fermentation a biochemical stage. For example, low white wine or edible alcohol diluted with water as raw materials, the application of quick brewing method of vinegar, only 1 day to 3 days will be wine vinegar.
(4) The white vinegar is prepared by adding water with edible glacial acetic acid, and then adding seasoning, spices, coloring and other things to make it vinegar with the flavor similar to brewing vinegar.
Baidu Encyclopedia - Table Vinegar