Oligolignans in Norway spruce and Scots pine knots and Norway spruce stemwood

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Stefan Willför, Markku Reunanen, Patrik Eklund, Rainer Sjöholm, Leif Kronberg, Pedro Fardim , Suvi Pietarinen, Bjarne Holmbom
Publisher: WALTER DE GRUYTER & CO
Publication year: 2004
Journal: Holzforschung
Journal acronym: HOLZFORSCHUNG
Volume number: 58
Issue number: 4
Start page: 345
End page: 354
Number of pages: 10
ISSN: 0018-3830


Abstract

Oligolignans present in substantial amounts in Norway spruce and Scots pine knots were characterised. The hydrophilic knotwood substances were extracted and different chromatographic methods were applied to obtain fractions for analysis by GC, GC-MS, HR-EI-MS, LC-ESI-MS, NMR, and FTIR. beta-O-4-Linked guaiacylglyceryl ethers of hydroxymatairesinol (la, lb, Ic), secoisolariciresinol (II), lariciresinol (III), isolariciresinol (IV), lignan A (V), liovil (VI), conidendrin (VII), and pinoresinol (VIII) were identified in the spruce knotwood extract and beta-O-4-linked guaiacylglyceryl ethers of nortrachelogenin (IX) and secoisolariciresinol (II) in the pine knotwood extract. The structures of allo-hydroxymatairesinol-4'-guaiacylglyceryl ether (Ia), hydroxymatairesinol-4-guaiacylglyceryl ether (lb), hydroxymatairesinol-4'-guaiacylglyceryl ether (Ic), secoisolariciresisinol-4-guaiacylglyceryl ether (II), and lariciresinol-4'-guaiacylglyceryl ether (III) were determined via GC-MS, HR-MS, and H-1 and C-13 NMR analyses. The structures of (Ia), (Ic), (IV), (V), (VI), (VII), and (IX) have not been reported earlier. Spruce stemwood, both heartwood and sapwood, also contained oligolignans in small amounts. In addition, some dilignans with four phenylpropanoid units were tentatively identified in the hydrophilic knotwood substances.


Keywords

ASE, C-13 NMR, dilignans, FTIR, guaiacylglycerol, guaiacylglyceryl ether, H-1 NMR, heartwood, knots, oligolignans, Picea abies, Pinus sylvestris, sesquilignans

Last updated on 2019-20-07 at 06:07