Casein is usually made from skim milk (rarely from buttermilk), by one of three methods: (1) naturally soured casein curdles when enough lactic acid develops from fermentation of milk sugar by the ever present bacterium Streptococcus lactisi; (2) acid casein is precipitated by adding dilute hydrochloric acid or ...

How is casein produced?

Casein is precipitated from skim milk by acidifying it to produce acid casein, or the milk is treated with rennet to produce rennet casein. The precipitated casein curd is separated from the whey, washed, and dried. The water-soluble derivatives of acid caseins, produced by reaction with alkalis, are called caseinates.

Where does casein come from?

Casein protein is a protein found in milk that gives milk its white color. Cow's milk consists of around 80% casein protein. In addition to milk, casein protein is found in yogurt, cheese, and infant formulas, as well as in a variety of dietary supplements. Do not confuse casein protein with casein peptides.