Refractive index mutarotation measurement

Reduction of sugar sulfonates by lithium aluminum hydride, 269 Refractive index, mutarotation measurement by, 50 R-Enzyme, 363 Rhamnose... 

The rate of the interconversion may also be followed by measuring the change in volume or in refractive index. Such measurements give rate coefficients identical with those obtained by the polarimetric method. In Table XVIII, rate coefficients for the mutarotation of a number of sugars are listed. The rates of mutarotation of several sugars (for example, D-ri-bose, D-galactose, and all the ketoses) do not obey the first-order law. Their complex mutarotations result from the presence in solution, in appreciable concentrations, of more than two species. In addition to pyranoses, there must be present either furanoses or acyclic forms, or both. 

Table VI gives, for a large group of sugars, a summary of the mutarotation constants and optical rotations measured at 0 and 20 in water or aqueous potassium hydrogen phthalate by Isbell and Pig-man. Most of the data were published in a circular now out of print Other compilations have been made by Hudson, Lowry, Osaka, Kendrew and Moelwyn-Hughes, Pratolongo (dilatometry and optical rotation, and Riiber and associates (dilatometry, refractive index, and polarimetry). " A considerable...

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See also in sourсe #XX -- [ , ]

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