The paper discusses acidic hydrolysis of hot-water preextracted chestnut wood and the production of monosaccharides, especially xylose. Sugar analysis was carried out with ion exchange chromatography. The chestnut wood was hydrothermally treated prior to hydrolysis, which considerably increased the yield of xylose. This is found mainly in fiber water or a lyophilizate, while the residue, that is wood fibre, in which an insignificant amount of xylose was to be found, may be used for other purposes.
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