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Extra resources for CHEMICAL CONSTITUTION OF THE PROTEINS Part 1
Subsequently Ritthausen and Kreussler isolated it from the hydrolysis it Kreussler could not demonstrate products of other vegetable proteins. presence in animal proteins, in which it was afterwards shown to occur in 1873 by Hlasiwetz and Habermann. Not only is glutamic acid formed by acid hydrolysis, but also by the action of enzymes: its Knieriem and Kutscher obtained its amide, glutamine, Schulze, v. is it by the tryptic digestion of fibrin, and found in the extracts of seedlings as shown by Gorup-Besanez and Scheibler.
THE CHEMICAL CONSTITUTION OF UNITS ITS 43 phenyl-a-aminopropionic acid and to exchange the sulpho-group for the hydroxyl group was not successful, as in the fusion with potash the side chain also became oxidised and no tyrosine resulted. NH 2 COOH -> I 2 COOH . NH COOH COOH 2 This compound had the same properties as the natural tyrosine, which was thus proved to be p-oxyphenyl-a-aminopropionic acid. , and Halsey, in 1899, synthesised tyrosine by the condensation of hippuric acid with p-oxybenzaldehyde in the presence of acetic anhydride.
As the gliadins are would seem that they are the same protein. There is all so much alike, it no striking peculiarity noticeable with the phosphoproteins ; the two caseinogens examined appear to have the same composition. Vitellin, which has been hydrolysed by three sets of investigators, has given very different results the most detailed examination is that by Hugounenq, whose values are lower than those of Abderhalden and ; Hunter and of Levene and Alsberg ; the latter observers used a purified The amount product, whereas the former used the commercial article.