The hemicelluloses of the wood of English oak

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Abstract
When oak sapwood hemicellulose A, from which the constituent anhydroglucose residues have been removed, or oak heartwood hemicellulose A is submitted to prolonged hydrolysis by means of takadiastase at 38-40[degree] and pH 4.5, it is completely converted into xylose and a soluble poly-saccharide (I) having [[alpha]]D20[degree]= [long dash] 51.2[degree] in water (c = 2), 3 parts by weight of the former to 2 of the latter being produced at all stages of the hydrolysis. Oak sapwood hemicellulose A after removal of anhydroglucose residues is therefore chemically identical with oak heartwood hemicellulose A. The soluble polysaccharide (I) gives rise, on hydrolysis with dilute sulphuric acid, to xylose and a xylonomethylaldobionic acid, and the recurring structural unit consists of six xylose residues and one methylhexuronic acid residue.

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