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Rennet has traditionally been used to separate milk into solid curds and liquid whey, used in the production of cheeses. Rennet from calves has become less common for this use, to the point that less than 5% of cheese in the United States is made using animal rennet today. [1] Most cheese is now made using chymosin derived from bacterial sources.
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]
Plasticized cheese mass is then cooled, drained of whey and shaped by hand. Shaped cheeses are cured in cold (8-12 °C), mildly acidic brine for 6 to 48 hours. For a long time, sulguni rennet cheese was produced only by local Georgian farmers but in 2012 the Georgian dairy company "LTD Sante GMT products" started producing packaged sulguni.
To fresh warm milk in an enameled bucket or deep pot is added whey (Ossetian: сылы / сулу, romanized: syly / sulu, from which the old name of cheese is Ossetian: сылыджын / сулугун, romanized: sylydžyn / sulugun, literally translated as "made in whey"), infused with the source of enzymes - pieces of cleaned and salted cow's stomach (rennet).
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.
Rennet contains the enzyme chymosin which converts κ-casein to para-κ-caseinate (the main component of cheese curd, which is a salt of one fragment of the casein) and glycomacropeptide, which is lost in the cheese whey. As the curd is formed, milk fat is trapped in a casein matrix.
There is a ripening period prior to adding rennet (a mixture of enzymes that coagulates milk into curds and whey) to the cheese. Typically 3 ounces of rennet are added per 100 pounds of milk, allowing it to set in a temperature range of 85 to 86 °F (30 °C). Better results were achieved using 4 ounces of rennet per 100 pounds of milk and ...
The cheese is made using traditional cheese-making techniques, including curdling the milk with vegetarian rennet and pressing the curds to remove excess whey. The cheese is then aged for several months, during which time it develops its distinctive flavor and texture. [5] [4] [2] [1] [7] [6] [3]
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