ix THE VEGETABLE ALBUMINS 377 



C 185 H 288 N 50 S0 68 + 2HCL. 



After four days' digestion a jelly-like compound called metartose was 

 split off. It is poor in sulphur, acid in character, and not acted upon 

 by gastric juice. 



C 315 H 504 N 90 S0 106' 



In addition to the latter a water-soluble complex with more sulphur 

 is formed, namely, parartose : 



also traces of a water-insoluble hetero-artose, 



3 (C 185 H 2S8 N 50 S0 68 ) + 12 H 2 = 2 (C^H^SOJ 



Artose Parartose. 



+ C 3 i 5 H 5 oAoS0 10(i 



Metartose. 



After eight days' digestion are formed the indigestible metartose and 

 three derivatives of parartose, namely : 



proto-artose, C 185 H 300 N 50 S 2 61 (rich in S.) 



hetero- C 74 H 130 N 20 S0 24 



deutero- C 156 H 244 N 40 S0 56 (poorer in S.) 



and finally, 



artolin-antipeptone = C 11 H 19 N 3 5 (no S.). 



The alcohol-soluble albumins have been analysed by Ritthausen and 

 by Osborne. 1 



The dissociation products are given on p. 71, Nos. 14 to 16. 



In maize is found zein, which is characterised by its solubility in 

 even strong alcohol. In absolute alcohol it is, according to Osborne, 2 

 insoluble, but is readily soluble in 96 per cent alcohol, and may be 

 precipitated by the addition of ether. Szumowski 3 has made use of 

 this solubility of zein, which distinguishes it from all other albumins, 

 proteids, and albumoses, in tracing its course through the body. 

 Zein is further characterised by becoming very readily quite insoluble 

 in contact with water, and then it is also not readily attacked by 

 digestive enzymes. Analyses are given by Ritthausen and Chittenden 

 and Osborne. 4 Its dissociation-products are given on p. 71, No. 13. 

 Zein does not contain any lysin. 



1 T. B. Osborne, 'Wheat,' Amer. Chem. Journ. 15. No. 6 (1894); Conn. Agri. 

 Exper. Station, 1893, p. 175; 'Rye,' Journ. Amer. Chem. Soc. 17. 429 (1895); 

 'Barley,' ibid. 17. 541 (1895). 



2 T. B. Osborne, ibid. 19. 525 (1897). 



3 W. Szumowski, Zeitschr. f. physiol. Chem. 36. 198(1902). 



4 R. H. Chittenden and T. B. Osborne, Amer. Chem. Journ. 1892. 



