Synthesis of Sugar \y^ 



might have been expected. Thus, using 250 c.c. of water to tW 

 proportions given the following were the resultH :— 



c.c of 10 per cent. c.c. of 31.5 per cent. c.c. of 3 r. per e*„t P„ .-...t 



10.0 - n 



0.0 

 0.0 



10.0 

 0.0 

 0.0 



|>ol>iiirri/«tion 



».8 - «H 



27.7 - H 



22.r> - 



c.c. of 4.9 )>er c«nt. 

 Kilo required 



9.« - 08 



2G.1 . u 



20.9 - 12 



Non -reducing sugar. 



In order to determine whether any non-reducing sugar war 

 formed, to 50 c.c. of calcium sugar concentrated to a thick syrup, 

 BaH^O^, solution was added. A small amount o^ white precipitate 

 was formed. This was filtered, washed, and treated with COj. 

 The filtrate contained a non-reducing sugar, giving reduction 

 after boiling with a drop of H.SO^, and pink with resorcin and 

 HCL, but no reaction with phenylhydrazin. Hence a small amount 

 of disaccharide resembling cane sugar is formed, hut the percentage 

 is much less than 1%, and is greater if the boiling is prolonged 

 during the production of sugar. 



In sugar synthesis by Ba and Sr, a small amount of ppt. always 

 forms, which does not dissolve even if boiled with excess of CHjO. 

 It yields sugar after treatment with COg, and is apparently a com- 

 pound of a disaccharide with BaHgOo, or Sr HoO.>. The amount 

 is always small if the sugar condensation is carried out under 

 proper conditions. 



Fischer has shown that in the presence of acids condensation of 

 disaccharides from mono-saccharides, particularly from levulose. is 

 possible, and it seems probable that any disaccharides formed are 

 not produced by directly polymerisation from CHjO, but indirectlj 

 from the monosaccharides. Hence their ap}x>arance would not neces- 

 sarily increase the apparent polymerising action of the alkali. 



Reduciug power of sugar st/rn/i. 



Although the synthetic syrup contains a mixture of sugars, it is 

 of some interest to determine its reducing power in glucose o<iuiva- 

 lents. 



The syrups were formcl by running 4.9"/, potassium hydrate- 

 into l>oiling foiinaldehyde, containing cahitnn fumuite. 



