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Demethylation and other modifications of industrial softwood kraft lignin by different laccase-mediator systems
RISE - Research Institutes of Sweden (2017-2019), Bioekonomi.
RISE - Research Institutes of Sweden (2017-2019), Bioekonomi.ORCID-id: 0000-0002-4521-1122
2017 (Engelska)Ingår i: The 7th Nordic Wood Biorefinery Conference held in Stockholm, Sweden, 28-30 Mar. 2017: NWBC 2017, Stockholm: RISE Bioekonomi , 2017, s. 242-243Konferensbidrag, Poster (med eller utan abstract) (Refereegranskat)
Abstract [en]

An industrial softwood kraft lignin was treated by different laccase-mediator systems (LMS) followed by comprehensive structural analysis. Analysis revealed that demethylation was a common reaction for all the LMS combinations investigated. After reaction, methanol was always released into the solutions. A reduction in the methoxyl content of the lignins was observed in the obtained products. The treatment reduced the quantities of different types of phenolic aromatic rings, with G units being the most attacked structures. Decarboxylation was also detected in two of the LMS, namely L1-TEMPO andL2-HBT. The highest demethylation rate came from the L1-ABTS combination and the most severe overall structural modification. Lignin polymerisation was observed for all treatments, with the L1-ABTS combination demonstrating the highest Mp, Ma and Mw values. An increased polydispersity was also observed for all the treatments, with the highest increase in polydispersity found for the L1-ABTS treatment. In addition, lignin depolymerisation took place. It has been concluded that the most efficient demethylation was achieved by N51002-ABTS.

Ort, förlag, år, upplaga, sidor
Stockholm: RISE Bioekonomi , 2017. s. 242-243
Nyckelord [en]
demethylation, enzymatic treatment, kraft lignin, laccase, softwood, structural analysis
Nationell ämneskategori
Pappers-, massa- och fiberteknik
Identifikatorer
URN: urn:nbn:se:ri:diva-29756ISBN: 9789186018207 (tryckt)OAI: oai:DiVA.org:ri-29756DiVA, id: diva2:1104074
Konferens
7th Nordic Wood Biorefinery Conference held in Stockholm, Sweden, 28-30 Mar. 2017
Tillgänglig från: 2017-05-31 Skapad: 2017-05-31 Senast uppdaterad: 2023-03-27Bibliografiskt granskad

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Li, Jiebing

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