NMR spectroscopic methods, based upon 1H and 13C and two-dimensional long-range heteronuclear shift correlation, have been used accurately to define the positions of esterification to D-glucopyranose of structurally related phenolic acids in natural polyphenols. Quantitative measurements of physical properties i.e. gelling, distribution between octan-1-ol and water, and self-association of natural phenolic esters are described and related in some cases to features of putative biogenetic schemes for these metabolites.
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Spencer et al. (1990) studied this question.
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