Polarographic Study of Monosaccharides in Unbuffered Solution and Its Application to the Determination of the Mutarotation Rate Constants

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The polarographic behavior of monosaccharides in unbuffered neutral solution was investigated. The limiting current was ascertained to be an autocatalytic current which could be caused by the production of hydroxyl ion at the electrode surface. Equations for the characteristic limiting current and for the shape of current-potential curve were derived by use of the reaction layer concept. Experimental results for D-glucose, D-galactose, and D-xylose were fairly well expressed by these equations. The wave can also be applied to the determination of the mutarotation rate constants of monosaccharides, the values obtained (D-glucose: 0.53×10−3 s−1, D-galactose: 0.54×10−3 s−1, and D-xylose: 1.31×10−3 s-−1) being in fairly good agreement with those obtained by the polarimetric method (D-glucose: 0.4×10−3 s−1, D-galactose: 0.5×10−3 s−1, and D-xylose: 1.3×103 s−1).
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