The present state of knowledge of the metabolism of gallic acid in higher plants is reviewed and its unique features are noted. Methods for the structure determination of natural galloyl-D-glucose esters are outlined and applied to the elucidation of the structure of several new galloyl-D-glucose derivatives isolated from the leaves of higher plants. Finally the structure of the ‘gallotannins’ based on β-penta-O-galloyl-D-glucose is reassessed on the basis of h.p.l.c. analysis and 13C n.m.r, spectroscopic measurements.
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Haddock et al. (1982) studied this question.