On the Diastase of Koji, 325- 



45° C, 10 grms. of dry starch, and the extract of 10 grms. of koji 

 being contained in 500 cub. centims. 



Table XVI.— Action of Koji Extract on Starch at 45° C. 

 10 grms. of starch to 10 grms. of koji. 



Time. 



Dry starch 



in 500 

 cub. centims. 



eight of 

 koji used, 

 as extract. 



Total starch 

 products. 



Specific 

 rotatory 

 power. 





Grms. 

 10 



Grrms. 

 10 



Grrms. 

 9-48 



142°6 



25 „ 



9-93 

 9-93 



126 3 

 106 



l x 









103 6 









9*-98 



103 



3 „ i. 







9-98 



98-3 



4 „ 









98 -3 



Fresh koji added. 







10 18 



88 













These results are represented graphically by Curve Gr. The fall is 

 very rapid for the first five minutes, until a specific rotatory power of 

 142°'6 is attained, then the curve follows an almost straight line till 

 one hour has elapsed, a specific rotatory power, p=106° being attained. 

 After this it follows an almost horizontal path until a fresh addition 

 of koji extract was made, when it again falls, the inclination being 

 almost the same as between five minutes and one hour. This shows 

 that the cessation at 106° was due to the exhaustion of the koji 

 extract, and not to the existence of any definite chemical equation 

 corresponding to p=106°. 



Curve G-. 



Action of koji extract on starch at 45° C. 

 (The thick vertical line indicates fresh addition of koji solution.) 



Time in hours 



