Investigatory project chemistry to find casien in milk
Answers
Casein consists of a fairly high number of pralinepeptides, which do not interact. There are also no disulphidebridges. As a result, it has relatively little secondary structureor tertiary structure. Because of this, it cannot denature. It isrelatively hydrophobic, making it poorly soluble in water. It isfound in milk as a suspension of particles called caseinmicelles which show some resemblance with surfactant-typemicellae in a sense that the hydrophilic parts reside at thesurface. The caseins in the micelles are held together bycalcium ions and hydrophobic interactions. These micelleshave negative charge and on adding acid to milk the negativecharges are neutralized.
The isoelectric point of casein is 4.7. The purified proteinis water insoluble. While it is also insoluble in neutral saltsolutions, it is readily dispersible in dilute alkalis and in saltsolutions such as sodium oxalate and sodium acetate
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