Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Demethylation and other modifications of industrial softwood kraft lignin by laccase-mediators
RISE - Research Institutes of Sweden (2017-2019), Bioekonomi. KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
RISE - Research Institutes of Sweden (2017-2019), Bioekonomi, Bioraffinaderi och energi. KTH Royal Institute of Technology, Sweden.ORCID-id: 0000-0002-4521-1122
2018 (engelsk)Inngår i: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 72, nr 5, s. 357-365Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Substitution of phenol in phenol-formaldehyde (PF) resin preparations by technical lignins is hindered by the inherently lower reactivity of lignin compared to phenol. Demethylation of an industrial softwood kraft lignin (SKL) to improve its reactivity is the focus of this paper. To this purpose, kraft lignin (KL) was treated with two commercial laccases, NS51002 (L1) and NS51003 (L2), for 24 h in combination with three mediators, 2,2′-azinobis-(3-ethyl-benzothiazoline-6-sulfonic acid) diammonium salt (ABTS), 1-hydroxybenzotriazole (HBT) and 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO). The characterizations of the reaction solution and the resultant KL showed that methanol was released as a result of the methoxy group splitting from the aromatic rings, while such demethylation was dependent on the laccase-mediator system (LMS). The catechol structures formed, which were further oxidized to a quinone structures prone to polymerization, led to molecular mass increment. Also this reaction was LMS dependent. The same is true to the cleavage of β-O-4′ linkages, which resulted in depolymerization. The L1-ABTS, L1-TEMPO and L2-HBT combinations are the most efficient and the resulting modified lignin would be suitable to phenol substitution. Challenging is the lignin polymerization following the demethylation, especially in case of L1-ABTS, which might inhibit the reactivity of the treated lignin. 

sted, utgiver, år, opplag, sider
2018. Vol. 72, nr 5, s. 357-365
Emneord [en]
2D-NMR, 13C-NMR, 31P-NMR, demethylation, FTIR, laccase, lignin, mediator, SEC, Chemical reactions, Enzymes, Nuclear magnetic resonance spectroscopy, Phenols, Polymerization, Softwoods, 13C NMR, 2-D NMR, Laccases
HSV kategori
Identifikatorer
URN: urn:nbn:se:ri:diva-33510DOI: 10.1515/hf-2017-0096Scopus ID: 2-s2.0-85043767270OAI: oai:DiVA.org:ri-33510DiVA, id: diva2:1192848
Tilgjengelig fra: 2018-03-23 Laget: 2018-03-23 Sist oppdatert: 2023-03-27bibliografisk kontrollert

Open Access i DiVA

Fulltekst mangler i DiVA

Andre lenker

Forlagets fulltekstScopus

Person

Li, Jiebing

Søk i DiVA

Av forfatter/redaktør
Li, Jiebing
Av organisasjonen
I samme tidsskrift
Holzforschung

Søk utenfor DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric

doi
urn-nbn
Totalt: 36 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
v. 2.43.0