Casein Protein - Purified Water-insoluble Milk Protein With Low Tertiary Structure Rich In Proline Peptides And Colloidal Micelles

Backed by rich industry experiences we are leading Exporter Manufacturer Distributor & Supplier of Casein Protein in Bikaner Rajasthan India. Casein consists of a fairly high number of proline peptides which do not interact. There are also no disulfide bridges. As a result it has relatively little tertiary structure. It is relatively hydrophobic making it poorly soluble in water. It is found in milk as a suspension of particles called casein micelles which show some resemblance with surfactant-type micellae in a sense that the hydrophilic parts reside at the surface. The caseins in the micelles are held together by calcium ions and hydrophobic interactions. Several models account for the special conformation of casein in the micelles (Dalgleish 1998). One of them proposes the micellar nucleus is formed by several submicelles the periphery consisting of microvellosities of ?-casein (Walstra 1979; Lucey 2002). Another model suggests the nucleus is formed by casein-interlinked fibrils (Holt 1992). Finally the most recent model (Horne 1998) proposes a double link among the caseins for gelling to take place. All three models consider micelles as colloidal particles formed by casein aggregates wrapped up in soluble ?-casein molecules. The isoelectric point of casein is 4.6. Since milk's pH is 6.6 casein has a negative charge in milk. The purified protein is water insoluble.