Abstract
Molecular weight distributions for several proanthocyanidin polymers (condensed tannins) have previously been shown to be characterized by DP w/DP n > 2, where DP denotes the degree of polymerization. Molecular weight ratios of the size observed experimentally are expected if a few percent of the units form trifunctional branch points. An independent assessment of the extent of branching can be obtained from analysis of intensities of resonances in the 13C NMR spectra. Similar branch contents are deduced from DP w/DP n and from the spectral analysis. In the case of the Chinese quince ( Chaenomeles chinensis) polymer, about 3% of the epicatechin units form trifunctional branch points.
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