Practical physiological chemistry; a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . occurs among those of many or most of has shown that the J-amyl alcohol which is produced by yeastfermentation originates from isoleucine and the isoamylalcohol origi-nates from leucine. Isoleucine is dextro-rotatory. Lysine, CH2 (NH2) ? CH2 • CH2 • CH2 • CH (NH2) • COOH.—The threebodies, lysine, arginine, and histidine, are frequently classed togetheras the hexone bases. Lysine was the first of the bases discovered. Itis a-e-diammo-cap
Practical physiological chemistry; a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . occurs among those of many or most of has shown that the J-amyl alcohol which is produced by yeastfermentation originates from isoleucine and the isoamylalcohol origi-nates from leucine. Isoleucine is dextro-rotatory. Lysine, CH2 (NH2) ? CH2 • CH2 • CH2 • CH (NH2) • COOH.—The threebodies, lysine, arginine, and histidine, are frequently classed togetheras the hexone bases. Lysine was the first of the bases discovered. Itis a-e-diammo-caproic acid and hence possesses the following structure: ^ These balls of so-called impure leucine do contain considerable leucine, but inasmuchas they may contain many other things it is a bad practice to allude to them as leucine. PROTEINS NH2H H H XHoH—C—C—C—C—C—COOHH H H H H 81 Fig. 29.—^Lysine Picrate. It is dextro-rotatory and is found in relatively large amount in caseinand gelatin. Lysine is obtained from nearly all proteins, but is absentfrom the vegetable proteins which are soluble in strong alcohol. It is. Fig. 30.—AsPARTic Acid. the mother-substance of cadaverin and has never been obtained incrystalline form. Lysine is usually obtained as the picrate which issparingly soluble in water and crystallizes readily. These crystals areshown in Fig. 82 PHYSIOLOGICAL CHEMISTRY Aspartic Acid, C4H7NO4.—Aspartic acid is amino-succinic acid andhas the following structural formula: NH2H—CCOOH . H—CCOOH. IH The amide of aspartic acid, asparagine, is very widely distributedin the vegetable kingdom. Asparagine has the following formula. NH2 H—CCOOH I H—CC0(NH2). H The crystalline form of aspartic acid is exhibited in Fig. 30. Aspartic acid has been found among the decomposition products ofall the proteins examined, except the protamines. It has not been ob-tained, however, in very large proportion from any of them. Theaspartic acid obtained fro
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiochem, bookyear1916
