At present, there are many types of preservatives, which are mainly divided into synthetic and natural preservatives. Different preservatives have different anticorrosion principles. Some preservatives prevent corrosion by interfering with the microbial enzyme system, destroying its normal metabolism, inhibiting enzyme activity, and the like.
Some preservatives are suspected and denatured by microbial proteins, which interfere with their survival and reproduction. Other preservatives can change the permeability of the plasma membrane and cause the loss of enzymes and metabolites in the body. Live to achieve ultimate anti-corrosion purposes.
In the case of synthetic preservatives, sorbic acid and its salts, benzoic acid and its salts, and parabens are commonly used; sorbic acid preservatives include sorbic acid, potassium sorbate and calcium sorbate. Variety. Among them, sorbic acid is generally not used; calcium sorbate FAO/WHO stipulates that its use range is small, so it is not often used; potassium sorbate has no disadvantages, is easily soluble in water, has a wide range of use, and is often used.
As a preservative, potassium sorbate is unsaturated hexacarbonic acid, which is white or light yellow granules, and the content is 98%--102%; no odor or slight odor, easy to absorb moisture, easy to oxidize and turn brown; Light and heat stable, with high antibacterial properties, inhibiting the growth and reproduction of mold.