Abstract
A series of pectins with different levels and patterns of methyl esterification was produced by treatment of a very highly methylated pectin with acid, alkali, plant pectin methyl esterase and fungus pectin methyl esterase. The intrinsic p K values, as well as the free fractions of monovalent and calcium counterions, were determined on pectin salt-free solutions. The variations of p K a versus the ionisation degree were found to depend on the de-esterification process but a unique value of 2.90±0.15 was estimated for the intrinsic p K value. Calcium binding properties of chemically and enzymatically de-esterified pectins were investigated and experimental results were compared to Manning's theoretical values. A progressive dimerisation process for pectins with a blockwise distribution of carboxyl groups in the presence of calcium ions is hypothesised.
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