324 Prof. R. W. Atkinson. 



' Table XV.— Action of Koji Extract upon Starch at 40° C. 

 10 grms. of starch to 10 grms. of Tcoji. 



Time. 



Dry starch 

 in 500 

 cub. centims. 



Weight of 

 Jcoji used, 

 as extract. 



Total starch 

 products. 



Specific 

 rotatory 

 power. 



. 



Grrms. 

 10 



Grrins. 

 10 



, 5) 



Grrms. 

 9 64 

 9 64 

 9 64 

 9-65 

 9-67 

 9-69 

 9-79 



143 1 

 127 

 115 

 105 



88 



86 



80 



1 „ 





3 » 



4* „ 



6 „ 



+ 20 hours at 15° C. . 



The preceding results are represented graphically by Curves E and F- 

 The influence of a greater proportion of the Jcoji solution will again be 

 noticed in the much greater fall in specific rotatory power in a given 

 time ; and further, that in neither of these curves is any very sudden 

 bending to be observed. The inclination of the curve during the first 

 half an hour is certainly greater than it is afterwards ; but, although 

 in neither case has the activity of the diastase been destroyed, the 

 bending does not occur at the same specific rotatory power. This is 

 doubtless owing to the action of the diastase upon the maltose first 

 formed, which at this temperature is rapidly hydrated to dextrose.. 

 The hydration is more rapid in the case of the experiments repre- 

 sented by Curve F, although in other respects the two curves show a 

 remarkable similarity. 



Ctteves E AJ»'D F. 

 Action of Jcoji extract on starch at 40° C. 



Time in hours. 



The next table gives the results of an experiment carried out at 



