How Is Rennin Obtained?

Rennin, also called chymosin, protein-digesting enzyme that curdles milk by transforming caseinogen into insoluble casein; it is found only in the fourth stomach of cud-chewing animals, such as cows. ... In animals that lack rennin, milk is coagulated by the action of pepsin as is the case in humans.

How do you get rennin?

Animal rennet is an enzyme obtained from the fourth stomach of an unweaned calf (this can include veal calves, or even lamb and kid) but is nowadays available in a liquid form (though some still traditional producers – e.g. Beaufort – still use strips of dried stomach).

How is rennin extracted?

Deep-frozen stomachs are milled and put into an enzyme-extracting solution. The crude rennet extract is then activated by adding acid; the enzymes in the stomach are produced in an inactive form and are activated by the stomach acid. ... Typically, 1 kg of cheese contains about 0.0003 g of rennet enzymes.