Figure 3 Curve showing action of koji on maltose

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Time in hours.

Time in hours.

50 c.c. of this solution were mixed with 50 c.c. of a solution of koji and heated to 45°C for 1-1/2 hour. After being diluted to 250 c.c. the solution contained 4.145 grams of solid matter in 250 c.c., and deducting 1.285 gram contained in the 50 cc of koji solution added, we get 2.86 grams of solids formed from the 50 c.c. of dextrin solution, instead of 2.78 grams originally present. After making allowance for the rotation caused by the koji solution, the specific rotatory power of the dextrin products was 92°, instead of 174° that of the substance at starting. The koji solution had become exhausted, because when an additional amount of koji solution was added, and the mixture heated for a longer time, the specific rotatory power further diminished to 85°. This experiment leaves no doubt concerning the gradual absorption of water by dextrin under the solution of koji.

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