1909.] PUBLIC DOCUMENT — No. 31. 113 



Medium Green Soy Beans. 



[Dry Matter.] 



Per Cent. 



Ash, 5.46 



Protein, 40.31 



Fiber, ............ 4.91 



Nitrogen free extract, ......... 27.08 



Fat, 21.G4 



The above results are substantiated by those reported by 

 Rein,^ Langworthy^ and W. O. Atwater,^ showing the beans to 

 be highly nitrogenous and to contain a large amount of oil. The 

 protein of soy beans, according to the analyses of T. B. Osborne 

 and G. F. Campbell,^ consists (a) largely of glycinin, a globu- 

 lin similar in proj)erties to legumin but of somewhat diiferent 

 composition; {h) a small amount of a more soluble globulin, 

 which resembles phaseolin in composition -so far as could be 

 ascertained in reactions; {c) 1.5 per cent, of legumelin, an 

 albumen-like proteid ; and {d) a small amount of proteose. 



Winton^ has shown that a sample of soy bean meal with a 

 nitrogen free extract of 27.2 per cent, contained 9.7 per cent, 

 of starch, sugar and dextrin expressed as starch.^ Of the re- 

 mainder, about 5 per cent, is pentosans^ and 1 per cent, galac- 

 tau,^ leaving 11.5 per cent, undetermined. As glycinin, the 

 chief ju'oteid, contains 17.53 per cent, of nitrogen (factor 5.70 

 instead of 6.25) the undetermined extract matter should be 

 even greater than appears. Kellner and Inoyue-^ deny the 

 presence of any appreciable amount of starch, while Morawski 

 aud Stingn claim the starch is converted by an active diastatic 

 enzyme into sugar and dextrin. By precipitating an alcoholic 

 extract of the beans with ether, Levallois^ obtained a sugar 

 which does not reduce Fehliug solution, ferments readily with 

 yeast and upon oxidization with nitric acid yields mucic and 

 oxalic acid. 



1 Loco citato. 



2 Conn. Storrs Exp. Sta. Rpt., 14 (1901), p. 178. 



3 Conn. State Exp. Sfai. Rpt., 21 (l«)7), pp. 374-382. 



4 Determinerl by the diastase method, without previous washing. 



5 Hatch Exp. Sta. Rpt., 1.5 (11)03), p. 79. 



6 Hatch Exp. Sta. Rpt., 9 (1897) , p. 9.5. 



' Chem. Centbl., 1886, p. 724; Abs. Amer. Jour. Pharm. 



* Compt. Rend. Acad. Sci., Paris, 93, p. 281; Abs. Amer. Jour. Pharm. 



