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Oxidative polymeris...
Oxidative polymerisation of models for phenolic lignin end-groups by laccase
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- Areskogh, Dimitri (författare)
- KTH,Träkemi och massateknologi
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- Li, Jiebing (författare)
- KTH,Träkemi och massateknologi
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- Nousiainen, Paula (författare)
- University of Helsinki, Department of Chemistry
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- Gellerstedt, Göran (författare)
- KTH,Träkemi och massateknologi
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Sipilä, Jussi (författare)
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- Henriksson, Gunnar (författare)
- KTH,Träkemi och massateknologi
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(creator_code:org_t)
- Walter de Gruyter GmbH, 2010
- 2010
- Engelska.
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Ingår i: Holzforschung. - : Walter de Gruyter GmbH. - 0018-3830 .- 1437-434X. ; 64:1, s. 21-34
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The redox enzyme laccase can lead to cross-linking of lignin molecules by oxidising phenolic end groups to resonance-stabilised radicals that can undergo radical coupling to form covalent bonds. This property has potential for many technical applications. However, laccase treatment can also lead to degradation. Experiments were performed with two laccases of different oxidation potential and pH and temperature optima. The predominant reaction following laccase oxidation is the formation of 5-5' and 4-O-5' bonds. If the 5-position is blocked, other reactions occur, including coupling of the 1-position and oxidation of the a-position, which aggravates cross-linking of different lignin molecules. The product profile generated by the two laccases is somewhat different, mainly because of the different pH rather than differences in enzyme activity. Reaction mechanisms and the technical and biological significance of the results are discussed.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Pappers-, massa- och fiberteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Paper, Pulp and Fiber Technology (hsv//eng)
Nyckelord
- biotechnology
- laccase
- lignin
- lignin model compound
- lignin
- polymerisation
- phenolic end group
- reaction mechanism
- flight mass-spectrometry
- kraft pulp
- mediator
- delignification
- degradation
- quinones
- polymers
- oxidase
- oxygen
- ms
- Cellulose and paper engineering
- Cellulosa- och pappersteknik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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