CH. XIII] QUANTITATIVE. 287 



a (maltose x '62) = glucose. 



[The numbers used above are obtained from these data : 

 342 grs. C^H^On 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. 



1 gr. maltose gives T05 grs. glucose on inversion. 

 /. 1 gr. maltose on inversion gives increased reducing 

 power = '43 grs. glucose (T05 *62). 



i= 2 ' 32 - 



.*. increase of glucose by inversion of maltose 



x 2-32 = 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 &- 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) 

 = -lgr. 



