Abstract
Two classes of phenolic-carbohydrate complexes were purified from the water-soluble products obtained from the digestion of ryegrass cell walls with a cellulase preparation. They contained D-glucose, D-xylose, L-arabinose, D-galactose and D-mannose residues in the ratios 3.6:10:6.3:1.4:2.3 and 5.3:10:3.0:1.1:2.1, respectively, and contained ca one ferulic acid residue to every 50–100 neutral sugar residues. The complexes were based on (1 » 4)β- D-xylan chains to which were attached residues of L-arabinofuranose and D-galactopyranose. Mixed linkage (1 » 3), (1 » 4)-β- D-glucan chains also appeared to be integral components of these complexes. Phenolic-carbohydrate complexes could also be solubilized from the enzyme-resistant residue on hydrolysis under mildly acidic conditions. Two complexes were purified and found to contain the neutral sugar residues listed above, along with small amounts of L-rhamnose, in the ratios 3.5:10:4.9:1.1:3.0 and 3.3:10:3.7:2.8:1.1:2.0, respectively. These latter complexes were also based on galacto-arabinoxylans associated with (1 » 3), (1 » 4)-β- D-glucans and also contained ferulic acid residues which could be released on saponification.
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