Potassium sorbate is the potassium salt of sorbic acid, chemical formula CH3CH=CH−CH=CH−CO2K. It is a white salt that is very soluble in water (58.2% at 20 °C). It is primarily used as a food preservative. Potassium sorbate is effective in a variety of applications including food, wine, and personal-care products. While sorbic acid is naturally occurring in some berries, virtually all of the world''s production of sorbic acid, from which potassium sorbate is derived, is manufactured synthetically.
Potassium sorbate is used to inhibit molds and yeasts in many foods, such as cheese, wine, yogurt, dried meats, apple cider, soft drinks and fruit drinks, and baked goods. Its breakdown to sorbitol, a sugar alcohol, has been shown to increase the chances of a bowel movement from eating prunes.It is used in the preparation of items such as hotcake syrup and milkshakes served by fast-food restaurants such as McDonald''s. It can also be found in the ingredients list of many dried fruit products. In addition, herbal dietary supplement products generally contain potassium sorbate, which acts to prevent mold and microbes and to increase shelf life. It is used in quantities at which no adverse health effects are known, over short periods of time.Labeling of this preservative on ingredient statements reads as "potassium sorbate" or "E202". Also, it is used in many personal-care products to inhibit the development of microorganisms for shelf stability. Some manufacturers are using this preservative as a Tube feeding of potassium sorbate reduces gastric burden of pathogenic bacteria.
Also known as "wine stabilizer", potassium sorbate produces sorbic acid when added to wine. It serves two purposes. When active fermentation has ceased and the wine is racked for the final time after clearing, potassium sorbate renders any surviving yeast incapable of multiplying. Yeast living at that moment can continue fermenting any residual sugar into CO2 and alcohol, but when they die, no new yeast will be present to cause future fermentation. When a wine is sweetened before bottling, potassium sorbate is used to prevent refermentation when used in conjunction with potassium. It is primarily used with sweet wines, sparkling wines, and some hard ciders, but may be added to table wines, which exhibit difficulty in maintaining clarity after fining.