Abstract
31P NMR spectroscopy has been applied to analyze two soluble steam explosion lignin preparations from aspen (populus tremuloides) and yellow poplar (liriodendron tulipifera) woods. In addition a ball milled preparation from cottonwood (populus deltoides) was also analyzed for comparative purposes.
The lignin produced by the steam explosion of yellow poplar contained significantly more syringyl than guaiacyl units. This difference was not so apparent for the case of the lignin produced by the steam explosion of aspen wood. The total phenolic hydroxyl content of both steam explosion lignins was determined to be considerably higher than that of a milled wood lignin from cottonwood while the opposite was true for the amount of aryl glycerol β-O-4 structures present in them.
It was thus confirmed that the steam explosion process induces cleavage of the aryl-glycerol 6-O-4 bonds with subsequent formation of free phenolic hydroxyls. Furthermore, the erythro form of 6-O-4 structures were invariably predominant in these lignins, in accord with the conclusions of previous reports on hardwood lignins.
It was thus shown that the application of 31P NMR spectroscopy to the analysis of steam explosion lignins may reveal important structural information which may aid process development and optimization.
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Argyropoulos, D.S. (1993). Phosphorus-31 NMR Analysis of Steam Explosion Lignins. In: Bridgwater, A.V. (eds) Advances in Thermochemical Biomass Conversion. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1336-6_131
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DOI: https://doi.org/10.1007/978-94-011-1336-6_131
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