Citric acid is widely used in daily life, which has both industrial and food grade uses. It is a commonly used food additive.

柠檬酸是一种有机酸，也叫枸橼酸，外观为无色晶体，易溶于水，有工业级柠檬酸、食品级柠檬酸，含水量的不同分为一水柠檬酸和无水柠檬酸。在室温下为无色半透明晶体或白色颗粒或白色结晶性粉末，在热水中结晶时会生成无水合物，在冷水中结晶时会生成一水合物。

Citric acid is an organic acid, also known as citric acid. It has a colorless crystal appearance and is easily soluble in water. There are industrial grade citric acid and food grade citric acid. Different water contents can be divided into monohydrate citric acid and anhydrous citric acid. It is colorless translucent crystal or white particle or white crystalline powder at room temperature. It will generate non hydrate when crystallized in hot water, and monohydrate when crystallized in cold water.

柠檬酸有温和的酸味用于各种饮料、汽水、糖果、点心、饼干等食品的制造中。无水柠檬酸多用于固体饮料，一分子结晶水柠檬酸多用作清凉饮料、果汁、水果糖、罐头等酸性调味剂，也是食用油的抗氧化剂，可改善食品的性状增强食欲和促进钙、磷物质的吸收。柠檬酸的盐类是某些食品需要添加钙离子和铁离子的强化剂。

Citric acid has a mild sour taste and is used in the manufacture of various beverages, sodas, candy, snacks, biscuits and other foods. Anhydrous citric acid is mostly used in solid drinks, and monomolecular crystalline water citric acid is mostly used as acidic flavoring agents such as cool drinks, fruit juice, fruit sugar, cans, etc. It is also an antioxidant of edible oil, which can improve the properties of food, enhance appetite, and promote the absorption of calcium and phosphorus substances. The salts of citric acid are the fortifiers that some foods need to add calcium ions and iron ions.

用柠檬酸或柠檬酸盐作助洗剂可改善洗涤产品的性能，使金属离子沉淀防止污染物重新附着在织物上维持洗涤需要的碱性。柠檬酸是一种良好的螯合剂，可提高活性剂的性能。可用作建筑陶瓷瓷砖的耐酸性的试剂。柠檬酸和改性柠檬酸制成的防皱整理剂用于纯棉织物的防皱整理，效果好且成本低。柠檬酸在80°C的情况下有很好的杀灭细菌芽孢的作用，对食品卫生很有好处。

Using citric acid or citrate as a detergent aid can improve the performance of the washing product, make metal ions precipitate and prevent pollutants from re attaching to the fabric to maintain the alkalinity required for washing. Citric acid is a good chelating agent, which can improve the performance of the active agent. It can be used as an acid resistant reagent for building ceramic tiles. The anti crease finishing agent made of citric acid and modified citric acid is used for anti crease finishing of pure cotton fabric with good effect and low cost. Citric acid has a good effect on killing bacterial spores at 80 ° C, which is good for food hygiene.

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