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Because of citric acid has a mild and refreshing acidity, widely used in all kinds of drinks, soft drinks, wine, candy, snacks, biscuits, canned fruit juices, dairy products, such as food manufacturing. In the market of all organic acids, citric acid more than 70% market share, seasoning, also can be used as a cooking oil antioxidants. At the same time improve the sensory properties of food, enhance appetite and promoting digestion and absorption of calcium, phosphorus substances in the body. Anhydrous citric acid used in solid drinks a lot. Citric acid salts such as calcium citrate and ferric citrate is the need to add some food fortifier calcium ion and iron ion. Citric acid ester of class triethyl citrate as a non-toxic plasticizer, make food packaging plastic film, is the citric acid beverage and food industry, preservatives 
Used in chemical industry and textile industry 

Citric acid in chemical technology to make a chemical analysis reagent, used as laboratory reagents, chromatography analytical reagent and biochemical reagents; Used as complexing agent, masking agent; Used to make buffer solution. Using citric acid or citric acid salts for help lotion, can improve the performance of washing product, can rapid precipitation of metal ions, prevent pollutants are attached to the fabric again, keep washing the necessary basic; The dirt and dust dispersion and suspension; Improve the performance of surfactant, it is a good rock mixture; Can be used for testing the acid resistance of ceramic tile of architectural pottery reagents. 

Clothing of formaldehyde pollution is a very sensitive problem, citric acid and citric acid can be made into a kind of modified formaldehyde-free crease resistant finishing agent, used for crease resistant finishing of cotton fabric. Not only anti-wrinkle effect is good, but the cost is low. 

3. Used for environmental protection 

Citric acid and sodium citrate buffer used for flue gas desulfurization. China is rich in coal resources, is the major parts of the energy, however, has been a lack of effective flue gas desulfurization technology, atmospheric SO2 pollution is serious. At present, there are nearly 40 million tons of SO2 emissions, study effective desulfurization technology, it is the top priority. Citric acid and sodium citrate buffer solution because of its low vapor, nontoxic, stable chemical properties, the SO2 absorption rate high reason, is the development value extremely the desulfurization sorbent. 

4. Used in livestock production 

Adding in the piglet feed, the citric acid, can early weaning, improve the feed utilization rate of 5% ~ 10%, increase the sow farrowing. The growing pig, 1% ~ 2% citric acid is added to the diet can improve daily gain, lower feed conversion ratio, increase the rate of protein digestion, lower back fat thickness, improve the meat quality and carcass characteristics. Citric acid is a new type of high efficient rare earth feed additives and is applicable to pigs, chicken, fish, shrimp, cattle, sheep, rabbit, silkworm, such as all kinds of animals, have promote animal growth, improve product quality, improve the disease resistance and the survival rate, improve the feed conversion, shorten the feeding period, etc. 

5. Used in cosmetics 

Citric acid is a kind of fruit acid, main effect is to accelerate the cutin renewal, commonly used in lotions, creams, shampoo, whitening, anti-aging products, acne products, etc. Cutin renewal help of melanin in the skin peeling, receive fine pores, blackheads dissolved, etc. For example for biotherm stream ShuMin cleansing mousse, make skin soft, comfortable, skin color, pure and fresh and pure. 

6. Used for sterilization 

The joint action of citric acid and the temperature of 80 ℃ has good kill bacteria spore, and can effectively kill the blood dialysis machine line in the pollution of bacterial spores. Known as the "king of the western" lemon have very strong sterilization effect, good for the food hygiene, plus the fragrant scent of lemon, people always like to use the cold dishes, tasty and refreshing, not only can increase appetite. 

7. Used in medicine 

In the formation of prothrombin activators and later in the process of coagulation, there must be a calcium to attend. Folic acid radical ion and calcium ions to form a complex, difficult to disintegrate and thus reduce the calcium ion concentration in the blood, and blood coagulation. When the goods in testing blood transfusion or anticoagulation, used as anticoagulant drugs in vitro.