58 



STUDIES OF AMERICAN BARI.F.YS AND MALTS. 



these reageiits. That such is the case the re-lilts here reported would 

 seem to indicate. Windisch" has already * shown that the phosphoric 

 acid compounds of barley undergo a very great change in malting, 

 the organic phosphorus being to a large extent hydrolyzed and con- 

 verted to the inorganic condition. It is quite probable that some 

 of this same organic phosphorus of barley, which i- soluble in water. 

 also changes into another form of organic phosphorus which is soluble 

 in alcohol and ether. 



The great increase in sugar is easily explained from the effect of 

 the diastatic action on starch. 



The growth of the embryo during germination is a natural one. 

 At the full malt period it has increased nearly 100 per cent, the va- 

 riation being from 38 to 209 per cent. This variation is because of 

 the fact that some grains begin to germinate and then stop, the length 

 of the acrospire being less than one-fourth of that of the grain itself, 

 whereas in a good malt its growth should be from three-fourths 

 to one. 



That a most active proteolytic action took place in the barley dur- 

 ing malting is clearly indicated by the increased amount of soluble 

 protein. Whereas the total protein suffered a loss averaging 12 per 

 cent, the amount of soluble protein increased over TO per cent, thus 

 showing that even as a very active diastatic action was noted by 

 the conversion of the starch into sugar, so an almost equal!} 7 active 

 physiological change due to the proteolytic enzyni was being brought 

 about in regard to the protein of barley. Similar results have been 

 obtained by Brown a and Evans. 5 



The results given in the following table show the relative amounts 

 of water-soluble proteins in high and low protein malts, and likewise 

 the amount of protein rendered soluble on mashing and found in the 

 wort: 



<>f soluble protein and proteins dissolved by mashing. 

 HIGH-PROTEIN MALTS (6-ROW). 



' !.<<. c-it. 



& J. Inst. P,ri'\v.. thruu.irli rlu- Wnhl-Henius " H.-nidyhuuk.- pp. 



