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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.
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.
GMP is unique from other milk peptides in several ways. Kappa-casein is the only glycosylated casein protein and GMP, which makes up much of Kappa-casein, is also glycosylated. The glycans make GMP the only portion of the casein micelle that is water soluble after curdling has occurred, and thus, the only fraction of casein protein to dissolve ...
A glass of soured milk whey. Whey is the liquid remaining after milk has been curdled and strained. It is a byproduct of the manufacturing of cheese or casein and has several commercial uses. Sweet whey is a byproduct resulting from the manufacture of rennet types of hard cheese, like cheddar or Swiss cheese.
The milk must be "ripened" before adding in the rennet. The term ripening means allowing the lactic acid bacteria (LAB) to turn lactose into lactic acid, which lowers the pH of the solution, greatly aiding in the coagulation of the milk. This is vital for the production of cheese curds that are later formed into cheddar.
It is commercially used to produce enzymes which can be used to produce a microbial rennet to curd milk and produce cheese. [ 2 ] Under experimental conditions, this species grows particularly well at temperatures between 24 and 55°C, and their growth becomes negligible below 21°C or above 57°C.
Acid-set or sour milk cheese is cheese that has been curdled (coagulated) by natural souring, often from lactic acid bacteria, or by the addition of acid. This type of cheese is technologically simple to produce. [1] When making soft acid-set cheese using bacteria, the coagulum results from production of lactic acid by the starter ...
Global milk production has increased rapidly over the past 50 years. According to Our World in Data, global milk production has nearly tripled since 1961, reaching around 930 million tonnes in 2022. The most popular milk is cow milk, followed by buffalo milk, goat milk, sheep milk and camel milk.