Abstract
Total beech wood and three derived fractions (holocellulose, acetylglucuronoxylan and technical acetylglucuronoxylan) were analysed by Curie-point pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS). The pyrolysis products can be divided into several main groups such as non-specific compounds, carbohydrate markers, lignin markers and chlorinated methoxyphenols. The latter group was only detected in the holocellulose fraction and in the (acetylglucurono)xylan fraction. Specific carbohydrate marker compounds detected by Py-GC-MS are anhydrohexoses and -pentoses as well as furan and pyran derivatives. The lignin marker compounds include a variety of mono- and dimethoxyphenols. The chlorinated methoxyphenols are released from chlorolignin residues present in the holocellulose and xylan fractions. The chlorination must have occurred during the delignification process with sodium chlorite. No chlorinated compounds were detected among the pyrolysis products from total beech wood nor among the technical (acetylglucurono)xylan pyrolysis products. The latter fraction was isolated from beech wood using a steam extraction process.
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