preservative

Preservatives are also known as antiseptics. It is a kind of food additive for the purpose of maintaining the original nature and nutritional value of food. Preservatives are a class of additives that inhibit microbial activity and prevent food spoilage to prolong shelf life. Depending on its role, it can be subdivided into preservatives, disinfectants, anti-mold agents, preservatives, etc. Preservatives are generally classified into four types: acid preservatives, ester preservatives, inorganic preservatives, and biological preservatives, depending on the source of the preservative. Preservatives commonly used in medicines are parabens, benzoic acid, sodium benzoate, ethanol, sorbic acid, etc., which can be used for internal medicine to prevent corrosion. Topical preservatives include chlorobutanol, phenol, and cresol. The preservative effectiveness of preservatives is highly dependent on pH. The paraben and benzoic acid preservatives have strong antiseptic properties under acidic conditions and have a lower potency under alkaline conditions. All kinds of preservatives have their effective antibacterial concentration, and should not be lower than this concentration when used. The amount of preservatives should not be too large to prevent harm to humans. The preservatives specified in the sanitary standards for the use of food additives in China include benzoic acid and its salts, sorbic acid and its salts, parabens, propionates, dehydroacetic acid, and in the food industry. Sulfur dioxide and pyrosulfites for other purposes. In addition, some are traditionally used as preservatives and as seasonings, and are not listed as statutory preservatives, such as salt, sugar, vinegar, wine or spices, which are not harmful to the human body and are not controlled in the domestic food additive standards. The above preservatives can only control low levels of pollution, and are not sufficient to control a higher degree of pollution. To this end, it must be compatible with reducing moisture in food, paying attention to production hygiene, and good packaging.