Enzymatic modification of lignin and lignin fractions obtained from preatreated biomass
The potential for using Trametes versicolor laccase to graft the polysaccharide chitosan onto chemically fractionated lignin was examined to enhance the solubility of lignin and to obtain products with special properties. Due to the complexity of lignin molecule the reaction was first performed on l...
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| Dokumentumtípus: | Könyv része |
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2017
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| Sorozat: | Proceedings of the International Symposium on Analytical and Environmental Problems
23 |
| Kulcsszavak: | Elektrokémia, Kémia |
| Online Access: | http://acta.bibl.u-szeged.hu/56184 |
| Tartalmi kivonat: | The potential for using Trametes versicolor laccase to graft the polysaccharide chitosan onto chemically fractionated lignin was examined to enhance the solubility of lignin and to obtain products with special properties. Due to the complexity of lignin molecule the reaction was first performed on lignin model compound with small molecular weight. The efficiency of the enzyme was investigated in the oxidative reactions of coniferyl alcohol with glucosamine. Alcell Lignin was previously fractionated by acetone/water 50:50 (v/v) and the enzymatic modification of the soluble fraction with chitosan was carried out in the same solvent system. The modified lignin was isolated and the product was characterized by means of size exclusion chromatography and FT-IR in order to evidence the main lignin modifications after laccase coupling reactions. An important increase of the molecular weight and significant structural modifications were observed for the product obtained after the coupling reactions of Alcell Lignin with chitosane demonstrating the achievement of the modification reactions. |
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| Terjedelem/Fizikai jellemzők: | 179-184 |
| ISBN: | 978-963-306-563-1 |