casein

enUK

casein

(kā`sēn), well-defined group of proteins found in milk, constituting about 80% of the proteins in cow's milk, but only 40% in human milk. Casein is a remarkably efficient nutrient, supplying not only essential amino acids, but also some carbohydrates and the inorganic elements calcium and phosphorus. The calcium caseinates form an insoluble white curd when acidified by hydrochloric acid or sulfuric acid, or when milk is soured by bacterial contaminants. Acid casein is used widely in cheese, adhesives, water paints, for coating paper, and in printing textiles and wallpaper. In neutral solutions the enzyme rennin converts one of the caseins to an insoluble curd; most of the protein in cheese is rennetrennet,
substance containing rennin, an enzyme having the property of clotting, or curdling, milk. It is used in the making of cheese and junket. Rennet is obtained from the stomachs of young mammals living on milk, especially from the inner lining of the fourth, or true,
..... Click the link for more information. casein curd. When treated with formaldehyde the curd forms casein plastic, used for manufacturing imitation tortoiseshell, jade, and lapis lazuli.

Casein

a complex phosphoprotein that is formed from its precursor caseinogen as a result of the splitting of peptide bonds in the process of milk curdling. Casein is readily soluble in saline solutions in neutral or alkaline media, and it precipitates when acidified. Its molecular weight is 75, 000–100, 000.

Casein is a heterogeneous protein; by physical and chemical methods it can be divided into three fractions that are similar to one another in amino-acid composition, (α-casein β-casein, and γ-casein). Dried casein is a tasteless and odorless white powder. Casein is the principal protein component of milk and milk products. Cow’s milk contains 2.8–3.5 percent casein; human milk, 0.3–0.9 percent. This most important dietary protein contains a complete complement of the essential amino acids; it contains especially high percentages of methionine (~3.5 percent), lysine (˜6.9 percent), tryptophan (~ 1.8 percent), leucine (˜12.1 percent), and valine (7.0 percent). The stomachs of mammals shortly after birth contain the enzyme chymosin, or rennin, which curdles milk (this can also be catalyzed by other proteolytic enzymes). In industry casein is used in the manufacture of paints, glues, synthetic fibers, and plastics.

I. B. ZBARSKII

casein

[′ka‚sēn] (organic chemistry) The protein of milk; a white solid soluble in acids.

casein

A protein; the chief nitrogenous ingredient of milk.

casein

a phosphoprotein, precipitated from milk by the action of rennin, forming the basis of cheese: used in the manufacture of plastics and adhesives

casein

enUK

casein

[ka´se-in] a phosphoprotein, the principal protein of milk, that is the basis of curd and of cheese. Casein, usually in the form of one of its salts, is added to the other ingredients of the diet to increase its protein content. note: In British nomenclature casein is called caseinogen, and paracasein is called casein.

ca·sein

(cā'sē-in, kā'sēn), The principal protein of cow's milk and the chief constituent of cheese. It is insoluble in water, soluble in dilute alkaline and salt solutions, forms a hard insoluble plastic with formaldehyde, and is used as a constituent of some glues; various components are designated α-, β-, and κ-caseins. β-Casein is converted to γ-casein by milk proteases. There are several isoforms of α-casein. κ-Casein is not precipitated by calcium ions.

casein

(kā′sēn′, -sē-ĭn)n. A protein that is the major protein in the milk of most mammals. It is the basis of cheese and is used in food products and in certain adhesives and paints.

ca·sein

(kā'sēn) The principal protein of cow's milk and the chief constituent of cheese.

casein

A protein derived from CASEINOGEN in milk by the action of renin in the stomach.

casein

a milk protein precipitated out of milk in acid conditions or by the action of RENNIN. It is the principal protein in cheese.

Patient discussion about casein

Q. Is it true that Casein protein can cause Cancer, or is harmful to the human body? Someone left a comment on my blog about Casein protein being bad for the body and that it could lead to Cancer. Is this true? A. I am not familiar with such information, Casein is a protein that is found in large amounts in breastmilk and milk products replacements for babies and as far as I know it has no such affect.

Q. I keep on hearing about "gluten" and "casein". What are those? When I was researching about autism in the net, I keep on hearing about "gluten" and "casein". What are those?A. These are protein fractions in wheat and milk. Research suggests they are not digested normally in most persons with autism but are incompletely broken down into absorbable molecules. Many people with autism show some improvement when these two dietary proteins are omitted.

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Synonyms for casein

noun a milk protein used in making e

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noun a water-base paint made with a protein precipitated from milk

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