Polyuronide Fraction and Soluble and Insoluble Carbohydrates of Orange Peel

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Abstract
Peel of Valencia oranges (I) and albedo of navel oranges (II) were separated into alcohol-soluble and insoluble fractions. Alcohol-soluble fraction averaged 57.31% for I and 55.19% for II, of the total dry wts.; soluble sugars were 55.4% total for I and 72.69% for II. This fraction also contained substances which were probably low polymer galacturonides. Alcohol-insoluble fraction averaged 42.69% for I and 44.81% for II. of the total dry wts. Total water and acid-soluble pectic substances averaged 39.76% for I and 34.87% for II; Insoluble residues averaged 30.53% and 30.41%, respectively. Residue consisted of hemicelluloses which contained small amts. of polyuronides rendered soluble by extraction. Methylation in I averaged 83.38%, and in 11,82.39%.

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