The mechanism of carbohydrase action. 6. Structure of a salivary α-amylase limit dextrin from amylopectin

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Abstract
A pentasaccharide a-limit dextrin formed from amylopectin by human salivary [alpha]-amylase has been subjected to structural analysis. Methylation analysis shows the pentasaccharide to contain one non-reducing-end group and one 1,6-link. The results of periodate oxidation indicate that the 1,6-linkage is the antepenultimate bond, relative to the reducing end of the molecule. The foregoing evidence, taken with the results of acid and enzymic hydrolysis and the high positive rotation of the pentasaccharide, shows the molecule to be 63-[alpha]-maltosylmaltotriose.