Potassium Sorbate (2.4-di-ethene acid kalium)is used for anti-mortify and qualitys guarantee on foods.

Use: Preservative: It is used for ferment dairy products, sour Lactic and pineapple juice etc.
Soy sauce, Marmalade, man-made cream, gelose soft sweets: 0.1-1.0g/kg.
Fruit juice, fruit drink, grape wine, fruit wine:0.1-0.6g/kg .
Carbonated wing, soda water:0.05-0.2g/kg.  Dried fish products, drinks of soy bean and milk, food of soy bean cake stuffing, lactobacillin drink: 0.1-1.0g/kg. Tobacco,cosmetics & toothpaste: 0.6-2, Concentrated fruit juice dosage mustn't exceed 2.0.