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Alkali-Soluble Phenolic Acids from a Xylan Fraction Isolated from Reed Canarygrass

MacGowan — Smith, Ltd., Exeter, CA 93221

ABSTRACT

A hemicellulose-containing fraction was extracted from reed canarygrass cell walls with dimethyl sulfoxide. The soluble fraction further was separated into a linear and branched component with iodine precipitation. The fraction precipitated with iodine contained a linear xylan with a xylose-arabinose ratio of 4.2 whereas that ratio for the iodine-soluble fraction was .6. The linear xylan fraction was high in phenolic acids relative to the branched xylan-containing fraction. Enhancement of hemicellulose digestibility of grasses by alkali pre-treatment may involve hydrolysis of linkages between the linear xylan portion of hemicellulose and p-coumaric and ferulic acids.