In terms of the three major nutritional components of food, the deterioration of protein is called corruption, which is characterized by odor due to the formation of low-grade sulfides or nitrides; the deterioration of carbohydrates is called fermentation, which is characterized by alcohols or acidity due to the production of low-grade alcohols and carboxylic acids; the deterioration of fat is called harassment or acidity, which is characterized by the production of low-grade aldehydes and ketones. Ha Wei. It not only deprives food of nutritional value, but also causes food poisoning after people eat rotten and spoiled food.

In the process of food processing, adding food additives can improve the stability of products, maintain the water-holding capacity of food, improve the shape, flavor and color of food within the allowable range of national standards. Food grade sodium hexametaphosphate(SHMP) is produced by thermal phosphoric acid, with low impurity content and strict detection of heavy metals.