1, chemical properties: citric acid (CA), also known as citric acid, molecular formula for C6H8O7. it is an important organic weak acid, colorless crystals, odorless, soluble in water, the solution shows acidic. In biochemistry, citric acid is an intermediate in the citric acid cycle (tricarboxylic acid cycle), a cycle that occurs in the metabolism of all aerobic organisms. Sodium citrate, also known as trisodium citrate and sodium citrate, is a sodium salt of an organic acid with the chemical formula C6H5Na3O7.It is white to colorless crystal in appearance, has a cool salty taste, and is stable in air. It is soluble in water, insoluble in ethanol, and the aqueous solution is slightly alkaline.

2, safety: citric acid as an edible acid, in the case of moderate consumption is not harmful to the human body. However, long-term consumption of food containing citric acid may lead to hypocalcemia. The raw material of sodium citrate basically comes from food, so it is considered absolutely safe and reliable, and will not be harmful to health.

3, applicability: citric acid has a wide range of uses, including as an acidity regulator, flavoring agent and chelating agent, as well as chemical analysis reagents in industry, experimental reagents and so on. In environmental protection, it can be used for flue gas desulfurization. In the livestock and poultry industry, citric acid rare earth is an efficient feed additive. In addition, citric acid helps to improve the taste of food, enhance human metabolism, and has the effect of antioxidant, anti-aging, beauty and skin care. Sodium citrate, on the other hand, is mainly used as a buffer, complexing agent, bacterial culture medium, and in medicine as a diuretic, expectorant, and anticoagulant. It is also widely used in food, beverages, electroplating, photography and other fields, is one of the basic agents of biological tests.