Abstract
Wood and milled wood lignins from beech ( Fagus sylvatica L.), spruce ( Picea abies Karst.), bamboo ( Bambus sp.) and teak wood ( Tectona grandis L.f.) were subjected to two types of pyrolysis: (1) direct pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS) and (2) off-line Py-GC with flame ionization detection (FID). Py-GC-MS studies were used for the identification of phenolic degradation products; 67 substances were identified, 50 of which could be quantified by GC-FID using authentic compounds. It was demonstrated that off-line Py-GC-FID is a suitable method for lignin classification of composed lignocellulosic materials without isolation of lignin. Quantitative pyrolysis results were used to calculate H: G: S ratios of lignins and the results were compared with data obtained from nitrobenzene oxidation and Fourier transform infrared analyses. Results of both of these methods were in good agreement with the off-line Py-GC-FID results.
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