CHEMISTRYreacted iodine, and titration with 0.1 thiosulfate using a Gilmont ultramicroburet of 1-ml. capacity.
RESULTSTwo known mixtures of glucose and the three pertinent mono-O-methyl-D-glucoses were analyzed. A comparison of the amount of each sugar weighed into the mixture and spotted on the chromatogram to the amount of that sugar determined by elution and titration is presented in Table I. It is evident from this table that a quantitative separation of the mono-O-methyl-D-glucoses was obtained. An indication of the efficiency of the separations is given in the per cent error column.The colors of the spots of the three mono-O-methyl-n-glucoses were not identical: 2-O-methyl-D-glucose gave a lavender spot, whereas the 3-O-methyl-o-glucose spot was yellowish brown and the 6-O-methyl-D-glucose spot a brownish yellow.
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