Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . Si:IN. 76 PHYSIOLOGICAL CHEMISTRY. This product is inactive, possesses a sweet taste and is quitereadily soluble in hot water. Serin crystals, obtained as adecomposition product of the proteid gliadin, are shown in , page 75. Cystin, C0Ht2O4N2S2.—Friedmann has recently showncystin to possess the following structural formula: CH2 • S——S • CH2 CH-NIL ICOOH CH- NH< COOH. Cystin is the principal sulphur-containing body obtainedfrom the decompo
Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . Si:IN. 76 PHYSIOLOGICAL CHEMISTRY. This product is inactive, possesses a sweet taste and is quitereadily soluble in hot water. Serin crystals, obtained as adecomposition product of the proteid gliadin, are shown in , page 75. Cystin, C0Ht2O4N2S2.—Friedmann has recently showncystin to possess the following structural formula: CH2 • S——S • CH2 CH-NIL ICOOH CH- NH< COOH. Cystin is the principal sulphur-containing body obtainedfrom the decomposition of proteid substances. It is obtainedin greatest amount as a decomposition product of such keratin-containing tissues as horn, hoof and hair. Cystin occurs in Fig. Cystin. small amount in normal urine and is greatly increased inquantity under certain pathological conditions. It crystal-lizes in the form of hexagonal plates which are thin and color-less; crystals obtained from the decomposition of the proteidgliadin are shown in Fig. 32. Cystin is soluble in alkalis, DECOMPOSITION PRODUCTS OF PROTEIDS. 77 ammonia, oxalic acid solution and mineral acids but practicallyinsoluble in water, acetic acid, alcohol and ether. It islaevorotatory. It has recently been claimed that cystin occurs in two forms,i. e., stone-cystin and proteid-cystin and that these two formsare distinct in their properties. This view Is incorrect. For a discussion of cystin sediments in urine see ChapterXIX. Tryptophan, C^H^N-jOo.—According to Ellinger, trypto-phan is indol-amino-propionic acid. Until very recently thisinvestigator thought the following was the correct structuralformula of this substance : NH2 IH-C-H IC-C-COOH. I H\/\/CHNH Further investigation by him, howeve
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