Structural Aspects of Partially Acetylated Degraded Amylopectins — A 13C NMR Study

1 3C NMR signal assignments were achieved for amylose and amylopectin triacetates and a series of partially acetylated, acid degraded amylopectin derivatives. Using the relative intensities of several of these signals for the latter materials the following could be deduced. First, within the molar substitution range of 0.47 and 0.72 the acetylation of partially degraded amylopectins takes place randomly distributed at all glucan moieties of the polysaccharide. Second, the probabilities of substitutions of hydroxyl groups in positions 2, 3, and 6 of a discrete glucan moiety are equivalent.