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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.
Chymosin / ˈ k aɪ m ə s ɪ n / or rennin / ˈ r ɛ n ɪ n / is a protease found in rennet.It is an aspartic endopeptidase belonging to MEROPS A1 family. It is produced by newborn ruminant animals in the lining of the abomasum to curdle the milk they ingest, allowing a longer residence in the bowels and better absorption.
Pfizer was founded in 1849 as "Charles Pfizer & Company" by Charles Pfizer and Charles F. Erhart, [5] two cousins who had immigrated to the United States from Ludwigsburg, Germany. The business produced chemical compounds, and was headquartered on Bartlett Street [ 6 ] in Williamsburgh, New York where they produced an antiparasitic called ...
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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]
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In general, 85 to 115 g (3 to 4 oz) of rennet is added per 450 kg (1,000 lb) of mix. The rennet serves to coagulate the milk protein and form curds. The vat must be mixed thoroughly after the addition of the rennet to ensure equal mixing, and it also helps to dilute the rennet to make it easier to spread around.