SUMMARY— A sample of a commercial slow‐set citrus pectin was separated into its major fractions on diethylaminoethylcellulose columns using increasing concentrations of NaH 2 PO 4 solution as the eluent. The fraction eluted with the lowest concentration of NaH 2 PO 4 had the highest methoxyl content, and later fractions, obtained with progressively increasing NaH 2 PO 4 concentrations, showed progressively lower methoxyl values. The per cent esterification and equivalent weight also decreased in a similar manner. This decrease in methoxyl content from one fraction to the next was accompanied by an increase in setting times and jelly grades. By using a viscosity measurement in 1% Calgon, no regular change in molecular weight from one fraction to the next could be observed and none of the fractions had a molecular weight as high as the original pectin.
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SMIT et al. (1967) studied this question.
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