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Animal rennet to be used in the manufacture of cheddar cheese. Rennet (/ ˈ r ɛ n ɪ t /) is a complex set of enzymes produced in the stomachs of ruminant mammals. Chymosin, its key component, is a protease enzyme that curdles the casein in milk. In addition to chymosin, rennet contains other enzymes, such as pepsin and a lipase.
To produce cheese, rennet or an edible acid is added to heated milk. This makes the milk coagulate or curdle, separating the milk solids (curds) from the liquid whey. [4] Sweet whey is the byproduct of rennet-coagulated cheese, and acid whey (also called sour whey) is the byproduct of acid-coagulated cheese. [5]
Cheddaring is a unique process in making cheddar cheese that involves stacking "loaves" of curd on top of one another in order to squeeze additional whey out of the loaves below. It is a multi-step process that reduces whey content, adjusts acidity, adds characteristic flavour, and results in a denser and sometimes crumbly texture.
Ricotta is a high-moisture cheese, like cottage cheese, but it is not a pressed curd cheese. It can be made from whey or a blend of milk and whey. Traditionally, ricotta was produced from the whey byproduct of mozzarella and provolone production, but modern techniques usually use whole milk (sometimes without any whey). Milk can be blended into ...
The situation of cheese is complicated as hard cheese often involves rennet, an enzyme that splits milk into curds and whey. Many forms of rennet are derived from the stomach linings of animals, but since the 1990s rennet is often made recombinantly in microbes because it can be produced more efficiently [18] (though many artisanal cheeses and ...
Native whey protein is extracted from skim milk, rather than being collected as a byproduct of cheese production. This type of whey does not contain glycomacropeptide, which is formed only after the addition of rennet. [14] [15] [16] There is evidence that whey protein is more bio-available than casein or soy protein. [17] [18]