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Solid state NMR analysis of β-13C-enriched lignocellulosic material during light-induced yellowing
Chalmers University of Technology, Department of Forest Products and Chemical Engineering.
Chalmers University of Technology, Department of Forest Products and Chemical Engineering.
Swedish Pulp and Paper Research Institute, Stockholm.
2001 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 55, no 3, p. 276-282Article in journal (Refereed) Published
Abstract [en]

Photoyellowing of lignocellulosic materials has been studied with a new technique based on solid state 13C-NMR analysis of 13C-enriched DHP in cell wall tissue. The selectively 13C-enriched cell wall-dehydrogenation polymer (CW-DHP) was prepared directly on differentiating xylem from spruce (Picea abies) at pH 6.0 by administering β-13C-enriched coniferin in an enzymatic system consisting of glucose oxidase, β-glucosidase, and the naturally occurring water-insoluble enzymes remaining in the cell wall. The bonding pattern of the formed CW-DHP was found to be: 42% β-β, β-5, and β-1 substructures; 36% β-O-4 derived substructures; and 22% coniferyl alcohol and coniferaldehyde end-groups. The 13C-NMR analysis of unirradiated and irradiated tissue revealed a decrease in the relative amount of coniferaldehyde and/or coniferyl alcohol end-groups during irradiation. Prolonged irradiation also introduced new signals centered at 37, 70, and 102 ppm. The results indicate that the present technique, with the formation of DHP in a naturally lignifying carbohydrate environment, has the potential of being a valuable tool for the study of structural changes of lignin during light-induced yellowing.

Place, publisher, year, edition, pages
2001. Vol. 55, no 3, p. 276-282
National Category
Bio Materials
Research subject
Wood Physics
Identifiers
URN: urn:nbn:se:ltu:diva-6670DOI: 10.1515/HF.2001.046Local ID: 4edf4720-0a96-11dc-9854-000ea68e967bOAI: oai:DiVA.org:ltu-6670DiVA: diva2:979556
Note
Validerad; 2001; 20070525 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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