Details
Title
Hemicellulosic polymers of cabbage leaves
Publication Date
1984
Call Number
A:PS
Summary
The hemicellulosic polymers of depectinated cell-wall material of immature cabbage leaves have been extracted by alkali, fractionated by ion-exchange chromatography and their structural features studied. In the 1 M potassium hydroxide-soluble fraction the main polymers are arabinoxylan-xyloglucan-pectic, arabinoxylanpectic-protein and arabinoxylan-xyloglucan-pectic-protein complexes. Small amounts of polyaccharide-protein-polyphenol complexes are also present. In the 4 M potassium hydroxide-soluble fraction the predominant polymers are two xyloglucans, the major one of which appears to have ca 10% of (1 - 4)-linked and 3% of (1 - 4, 6)-linked mannose residues associated with it, and both have terminal galactose, fucose and possibly arabinose residues in the side chains. Methylation analysis of the oligosaccharides, formed by degradation with cellulase, and partial hydrolysis of the methylated xyloglucan, followed by re-methylation with CD3I, have enabled the formulation of a tentative structure which is similar to other plant galactoxyloglucans. It was not possible to establish whether the mannose residues are part of an associated glucomannan or whether they are an integral part of the glucan backbone. The general structural features of the hemicellulosic polymers are discussed in the light of these results. [AS]
Journal Citation
v.23(2):339-347, PHYTOCHEMISTRY
Contact Information
harvest@worldveg.org
Record Appears in
Research > Published Articles