Because citric acid has a mild and refreshing acid taste, it is widely used in the manufacture of various beverages, soft drinks, wine, candy, snacks, biscuits, canned juices, dairy products and other foods.In all the organic acid market, citric acid market share of more than 70%, so far there is no acid agent can replace citric acid.Citric acid in a molecule of crystallized water is used mainly as an acidic flavoring in cool drinks, fruit juices, jams, fruit sugars and canned foods, and as an antioxidant in cooking oils.At the same time improve the sensory properties of food, enhance appetite and promote the digestion and absorption of calcium and phosphorus in the body.Anhydrous citric acid is used in large quantities in solid beverages.Salts of citric acid such as calcium citrate and iron citrate are fortifiers that require the addition of calcium and iron ions in some foods.Citric acid ester such as citric acid triethyl ester can be used as non-toxic plasticizer, manufacturing food packaging plastic film, is the beverage and food industry acid taste agent, preservative.