The Optical Properties of Melezitose

In the same article Wherry describes the optical properties of melezitose as follows  

Refractive Indices of Melezitose for Different Wave Lengths (Data of Wherry ) 

The crystallization of turanose was first reported by Pacsu and the writer as follows In 1918 one of us (H.) found an abundant supply of the rare melezitose in a certain kind of honeydew honey and from it he prepared a small quantity of sirupy turanose in the hope of crystallizing it. Other samples of turanose sirup were prepared subsequently from this stock of melezitose by other workers in the same laboratory. Recently it was observed by D. H. Brauns that one of these sirups, the exact history of which is not now known, had crystallized after standing many years. By the use of these crystals to nucleate turanose sirups which we have lately prepared from melezitose, it has been possible to obtain a rapid crystallization of the sugar in abundant quantities. To this quotation the writer can now add the information, kindly supplied recently by Mr. C. F, Walton, Jr., that Mr. Walton prepared the other samples of turanose sirup.  

Turanose is readily purified by recrystallization from hot methyl alcohol, in which it is moderately, though slowly, soluble. In preparing the sugar, the first stage of the hydrolysis of melezitose by an acid solution is carried out under well controlled conditions, and is followed by the removal of the D-glucose from its mixture with turanose. This is usually accomplished by a selective fermentation with yeast, but an 

Turanose crystallizes in well-formed prisms (see Fig. 5) it is anhydrous, shows the composition C1SH22O11 by combustion analysis, its melting point is 157°, and it exhibits a large and rapid mutarotation in water from an initial Cajo of about -1-22° to the final value -1-75.3° in the course of about thirty minutes. Isbell and Pigman found for the mutarotation of turanose at 20.7°, 4-27.3° (initial) — 4-76.8° 

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