Studies of the distribution of the 4-O-methyl-d-glucuronic acid residues in birch xylan |
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Authors: | Karl-Gunnar Rosell Sigfrid Svensson |
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Institution: | Department of Organic Chemistry, Arrhenius Laboratory, University of Stockholm, S-104 05 Stockholm Sweden |
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Abstract: | The distribution of the 4-O-methyl-d-glucuronic acid residues in birch xylan has been studied. Elimination of the 4-O-methyl-d-glucuronic acid residues of methylated birch-xylan was followed by specific cleavage of the xylan backbone at the originally branched d-xylose residues, using a technique involving sequential oxidation, β-elimination, and mild hydrolysis with acid. The molecular weight distribution of the resulting methylated oligosaccharides indicates that the 4-O-methyl-d-glucuronic acid residues are irregularly distributed in birch xylan. |
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