Abstract
The abnormally high dissolution of CaO in aqueous solution of carbohydrate such as glucose or xylose is attributed to the complex formation by the following facts. Solubility of calcium hydroxide in glucose solutions is proportional to the concentration of glucose, as their molar ratio is one to one. The value of the molar ratio is further confirmed by chemical analysis of the solid sample, deposited by pouring ethanol in the glucose solution saturated with Ca(OH)2.NMR spectra changing with time show clearly that the rates of deuterium exchange of the skeletal CH at C-1 and C-2 positions of glucose or xylose in D20 solution containing Ca(0D)2 are rapid enough as compared with those in D20 solution containing NaOD. Thus, it can be concluded that the complex is made of calcium hydroxide coordinated the carbohydrate in eriediol type in alkaline solution.Such a structure of Ca-complex is also supportedjby experimental results that the optical activities of D-glucose or D-fructose solutions decrease linearly with the amount of added CaO and that the IR spectra of the solid complex show characteristic absorptions suitable to this structure.
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