China liquor is a compound flavor with esters as the main body, koji and distiller's yeast as saccharifying and fermenting agents, and starch (sugar) as raw materials, which are cooked, saccharified, fermented, distilled, aged and blended. Strictly speaking, the blended wine made of edible alcohol and edible spices can't be regarded as liquor.
The correlation is as follows
Liquor is mainly concentrated in the triangle of Renhuai in Guizhou, Yibin in Sichuan and Luzhou in Sichuan in the upper reaches of the Yangtze River and Chishui River basin. It has the largest and best quality distilled liquor producing areas in the world, namely, Maowulu, the three famous wines in China. Its liquor industry cluster shoulders half of China liquor industry.
Aldehyde in liquor is an oxide of alcohol with corresponding molecular size, which will also be produced during liquor fermentation. Low-boiling aldehydes include formaldehyde and acetaldehyde, while high-boiling aldehydes include furfural, butyraldehyde, valeraldehyde and hexanal. Aldehydes are more toxic than alcohols, among which formaldehyde is the most toxic, about 30 times more toxic than methanol. It is protoplasmic toxin, which can coagulate protein, and 10g formaldehyde can kill people. In the case of acute poisoning, cough, chest pain, burning sensation, dizziness, unconsciousness and vomiting may occur.
Furfural is also harmful to health. When rice husk, corncob and bran are used as auxiliary materials, the content of aldehydes such as furfural in distilled liquor is high.
In order to reduce the aldehyde content in liquor production, rice bran, rice husk or cooking accessories in advance should be used less. When steaming wine, the temperature of flowing wine should be strictly controlled, and the total aldehyde content in wine should be reduced.