Abstract
The 400-MHz 1H-n.m.r. spectra of pectins with various degrees of esterification (d.e.), as obtained by methylation and subsequent partial saponification, have been measured. The d.e. was obtained from the intensity of the signal for H-5, which shifted downfield (∼3 p.p.m.) on esterification. Sequence-dependent shielding of H-5 and H-1 made it possible to determine the fractions of the four possible diads and the four galacturonate (G)-centred triads. The diad and triad frequencies obtained from the relevant peak-area ratios indicated that the action of alkali leads to pectic molecules in which free and methyl-esterified carboxylic acids are randomly distributed.
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