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After controlled acid hydrolysis of de-esterified apple, beet and citrus pectins, a fraction rich in galacturonic acid and rhamnose was isolated and further fractionated by ion-exchange chromatography. The main peaks, representing for each pectin > 30% of the rhamnose-rich fraction, and 50-78% of its rhamnose, were composed of rhamnose and galacturonic acid in equimolar proportions. Gel-permeation...
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