48 CHEMISTRY OF THE PROTEIDS CHAP. 



E. Fischer, 1 who did not succeed in preparing a perfectly pure 

 Z-phenylalanin, found for the d-phenylalanin 



O D = +35-08. 



A ready means of preparing racemic phenylalanin by the action of 

 ammonia on phenyl-brom-propionic acid is also described by E. Fischer. 2 



Phenylalanin is not readily soluble, as one part requires, according 

 to E. Fischer, 3 3 5 '3 ; according to Schulze and Winterstein, 4 3 9 '5 

 parts of water. Phenylalanin has a sweet taste. 5 On the oxidation 

 of phenylalanin with sulphuric acid and bichromate, the characteristic 

 smell of phenyl-acet-aldehyde is developed. 6 In contrast to the other 

 mono-amino acids, which are either not precipitated at all or only by 

 very strong solutions of phosphotungstic acid, phenylalanin is pre- 

 cipitated by 0'25 per cent solutions, 7 a fact which Schulze and 

 Winterstein 7 made use of for its isolation. They recommend ger- 

 minating Lupinus luteus and L. albus, two to three weeks old, as 

 most suitable for the preparation of phenylalanin. 8 



Phenyl-ethylamin, C 8 H n N 



is a derivative of phenylalanin and is basic in character. It was first 

 discovered by Nencki 9 in putrefying gelatine, and identified by him as 

 phenyl-ethylamine 10 after E. Sc^lze n had demonstrated the occurrence 

 of phenylalanin in germip-^g lupine. Phenylethylamine is obtained 

 from phenylalanin ty dry distillation, and is formed by a C0 2 group 

 being split off from the phenylalanin. Spiro 12 has shown that the 

 phenylethylamine obtained by putrefaction is identical with that 

 prepared synthetically. 



1 E. Fiw.W and A. Mouneyrat, Ber. d. deutsch. chem. Ges. 33 n 2383 nonm 



2 E. Fischer, ibid. 37. 3064 (1904). 



3 E. Fischer and A. Mouneyrat, ibid. 33. II. 2383 (1900). 



E. Schulze and E. Winterstein, Zeitschr. f. physiol Chem. 35. 299 (1902) 

 E. Fischer, Ber. d. deutsch. chem. Ges. 35. III. 2660 (1902). 

 6 E. Fischer, Zeitsthr. f. physiol. Chem. 33. 151 (1901) 



' E Schulze and E, Winterstein, ibid. 33. 574 (1901), 35. 210 (1902) Hausmai 

 has denied the precipitability (*,* 29. 138), but he is in the wrong for LtscTerand 

 Lohmann, ^bid. 44. 384 (1905), have confirmed Schulze and WinterLn 

 E. Schulze and E. Winterstein, ibid. 35. 299 (1902) 



. Nencki, Sitzk. d. kais. Akad. d. Wiss. in Wien, 1889 

 81 Barbieri ' Journ ' / !>** Ghem. 29. 331 (1888), and 14. 1785 



12 K. Spiro, Hofmeisters Beit. 1. 347 (1901). 



