Casein powder 9000-71-9

Casein is a phosphorus-calcium binding protein that is sensitive to acids and precipitates at low pH.

Casein is the main protein in the milk of mammals including cows, sheep and humans.

Alpha-casein is the main protein of mammals. There is no alpha-casein in human milk, and beta casein is the main form of casein. Casein is a source of amino acids, calcium and phosphorus to young children, and forms curds in the stomach for digestion.

Casein is a amphoteric protein with an isoelectric point of pH4.8. It is present in milk in the form of dicalcium phosphate, tricalcium phosphate or a combination of the two, and is extremely complex in structure. Until now, there is no completely defined molecular formula, and its molecular weight is about 57,000-375,000. Casein is found in about 3% of milk and accounts for about 80% of milk protein. Pure casein is a white, odorless, odorless granular solid. The relative density is about 1.26. Insoluble in water and organic solvents. Casein absorbs water and, when immersed in water, expands rapidly, but the molecules do not bind. Casein is mainly used as base material for coating, adhesive for wood, paper and cloth, additive for food, etc. As the base material of the coating accounts for about half of the total consumption, it has excellent water resistance, can disperse well in the pigment, improve the uniformity of the coating. In addition, the crude rennet protein is mainly used in the manufacture of plastic buttons because of its good fluidity and easy coating. Compared with other resin buttons, casein buttons have good dyeing, processing and bright color, and the quality is in the middle of the best. Casein is mixed with hydrated lime, sodium fluoride and copper sulfate, and then mixed with kerosene to obtain casein adhesive, which is used in aviation industry and wood processing sector. Casein is also used in medicine and biochemical reagents.