CH. XIII] QUANTITATIVE. 287 



a (maltose x '62) = glucose. 



[The numbers used above are obtained from these data : 

 342 grs. CiaHfflOn give 360 grs. C 6 H 12 6 on inversion. 

 /. glucose x '95 = cane-sugar or maltose. 

 1 gr. maltose has same reducing power as '62 grs. 



glucose. 



I gr. maltose gives 1*05 grs. glucose on inversion. 

 .*. 1 gr. maltose on inversion gives increased reducing 

 power = *43 grs. glucose (I'Oo '62). 



- 9-'^9 



48 ~ * 



.'. increase of glucose by inversion of maltose 



x 2 '3 2 = maltose ] 



An actual example will illustrate use of the above. 

 100 c.c. of an extract : 



(a) reduced 30 c.c. of Fehling. 



(6) after inversion with citric acid and neutralising, 

 38 c.c. Fehling. 



(c) after inversion with hydrochloric acid and neu- 

 tralising, 45 c.c. Fehling. 

 (10 c.c. Fehling = '05 grs. glucose.) 



Then 6-a = 38-30 = 8 c.c. Fehling = '04 grs. glucose. 



.*. cane-sugar = '04 x '95 = '038 grs. 

 c 6 = 45 -38 = 7 c.c. Fehling = '035 grs. glucose. 

 /. maltose = '035 x 2'32 = '081 grs. 



a = 30 c.c. Fehling = '150 grs. glucose. 



/. original glucose = '150 grs. ('081 x -62) 



= 1 gr. 



