The Vasa Warship: Lignin Characterization by means of Thioacidolysis and CP/MAS 13C NMR
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Vasaskeppet karakterisering av lignininnehåll med tioacidolys och CP/MAS 13C NMR spektroskopi (Swedish)
A great interest has been revealed for the chemical processes taking place in Vasa wood, and several research disciplines are involved in the examination. Today it is known that the polysaccharides in the wood are severely degraded, but not much effort has been put on the conditions of lignin, which is the focus of this study. By means of thioacidolysis and solid state NMR spectroscopy, the condition of the lignin polymer in Vasa wood was evaluated. Samples were taken from interior and exterior timber parts of Vasa, waterlogged Vasa wood, fresh oak wood and from timbers of two other warships of the same age. The guaiacyl and syringyl lignin monomers from the thioacidolysis reaction were analysed with gas chromatography-mass spectrometry. CP/MAS13C NMR was performed directly on the wood samples. The results revealed that no severe degradation of the lignin polymer has occurred in the Vasa wood. Additionally, a study of the neutral sugar composition of the wood was performed, showing no depolymerisation of either cellulose or hemicelluloses in the Vasa samples compared to fresh oak.
Place, publisher, year, edition, pages
2011. , 49 p.
thioacidolysis, lignin, guaiacyl, syringyl, waterlogged wood, Vasa warship
IdentifiersURN: urn:nbn:se:kth:diva-44406OAI: oai:DiVA.org:kth-44406DiVA: diva2:460507
Subject / course
Master of Science in Engineering - Chemical Science and Engineering
UppsokPhysics, Chemistry, Mathematics
Ek, Monica, Universitetslektor