182 



CONSTITUTION OF DISACCHAEOSES 



(b) Non-reducing sugars : 



Sucrose glucose and fructose. 

 Trehalose glucose and glucose. 



The constitution of the disaccharoses is not so well established as 

 that of the monosaccharoses. The following formulae have been pro- 

 visionally accepted : 



HCOH 



! 



CH,OH 



Maltose = glucose o-glucoside. 



CH 2 OH 



HOCH 



JH 2 OH 



Lactose = glucose /3-galactoside. 



CH 



HCOH 

 HOCH 



HOCH' 



HC 



HCOH 

 CH 2 OH 



Sucrose = fructose and glucose. 



