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Phenolic acids in wheat coleoptile cell walls
1Department of Forestry, Ohio Agricultural Research and Development Center, Wooster, Ohio 44691.
Abstract:
The phenolic constituent of nonvascular cell walls of wheat (Triticum aestivum L.) coleoptiles, which yields vanillin upon nitrobenzene oxidation, is not lignin as I previously claimed. It seems to be mainly ferulic acid bonded to carbohydrate, probably by an ester linkage. The acid is associated with a fraction of the wall rich in arabinose and xylose, although it is not known whether it is esterified directly with these pentose residues. The phenolic-carbohydrate complex is released by cellulase, but not by pronase or a mixture of hemicellulases.
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