US PATENT SUBCLASS 530 / 357
.~.~ Keratin

Current as of: June, 1999
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530 /   HD   CHEMISTRY: NATURAL RESINS OR DERIVATIVES; PEPTIDES OR PROTEINS; LIGNINS OR REACTION PRODUCTS THEREOF

350  DF  PROTEINS, I.E., MORE THAN 100 AMINO ACID RESIDUES {14}
353  DF  .~ Scleroproteins, e.g., fibroin, elastin, silk, etc. {3}
357.~.~ Keratin

DEFINITION

Classification: 530/357

Keratin:

(under subclass 350) Proteins having the structure of Keratin and compounds derived from these by addition to or deletion of parts of the polypeptide structure.

(1) Note. Physical Properties. Characteristic properties of keratins: (a) insolubility in water, including aqueous solutions of salts, hydrotropic, substances, and dilute acids and bases at tempertures not much above room temperature; (b) resistance to proteolytic enzymes: (c) resistances hydrolysis; (d) Lysis by mixtures of substances which break the -S-S- bonds and the hydrogen bonds.

(2) Note. Keratins contain all the common amino acids and have a high cystine content.

(3) Note. Sources. Horns, wool, feathers, shells, fingernail, claws, beaks, scales, whalebone (i.e., pseudokeratin).

(4) Note. CA Registry Number of unmodified form: [figure]

SEE OR SEARCH CLASS

536, Organic Compounds,

20, for the polysaccharide chitin.