Journal
CARBOHYDRATE POLYMERS
Volume 42, Issue 1, Pages 3-11Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0144-8617(99)00129-0
Keywords
mixed-linkage (1 -> 3),(1 -> 4)-beta-D-glucan; arabinoxylan; rye; structure
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A water unextractable fraction from rye bran was isolated by means of a sequential extraction. Gel filtration revealed a homogeneous beta-glucan and at least two different arabinoxylans. H-1 and C-13 NMR spectroscopy were used to identify the structural units in both polysaccharides. The isolated arabinoxylan contained a relatively high amount of unsubstituted xylose residues (56.7%). The molar ratio of cellotriosyl to cellotetraosyl units and the ratio of (1 --> 4) to (1 --> 3)-linkages in beta-glucan were determined using high performance anion-exchange chromatography with pulsed amperometric detection (HPAEC-PAD) and H-1 NMR, respectively. The molar ratio of cellotriosyl to cellotetraosyl was found to be 1.94. From this, the ratio of (1 --> 4) to (1 --> 3)-linkages was calculated to be 2.34, as compared to 2.31 obtained by H-1 NMR, showing that the results from both methods are in close agreement. (C) 2000 Elsevier Science Ltd. All rights reserved.
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