Chemical compositionSorbic acid is an unsaturated fatty acid with the chemical formula CH3 - CH = CH - CH = CH - COOH. It is also known as 2,4-hexadienoic acid. 
Physical appearanceSorbic acid is a white powder or crystal with a melting point of 134.5°C. It has a slightly acidic and astringent taste, and a faint odor. 
Antimicrobial propertiesSorbic acid is an effective inhibitor of molds, yeasts, and fungi. It is most effective at a pH close to its dissociation constant (pK = 4.76). 
UsesSorbic acid is used as a preservative in many foods, including processed cheese, wine, fruit juices, and baked goods. It is also used in processed meats as an alternative to nitrites. In cosmetics and personal care products, sorbic acid prevents spoiling by killing germs and slowing their growth.