Document Detail

On the role of the monolignol gamma-carbon functionality in lignin biopolymerization.
MedLine Citation:
PMID:  19056096     Owner:  NLM     Status:  MEDLINE    
In order to investigate the importance of the monomeric gamma-carbon chemistry in lignin biopolymerization and structure, synthetic lignins (dehydrogenation polymers; DHP) were made from monomers with different degrees of oxidation at the gamma-carbon, i.e., carboxylic acid, aldehyde and alcohol. All monomers formed a polymeric material through enzymatic oxidation. The polymers displayed similar sizes by size exclusion chromatography analyses, but also exhibited some physical and chemical differences. The DHP made of coniferaldehyde had poorer solubility properties than the other DHPs, and through contact angle of water measurement on spin-coated surfaces of the polymeric materials, the DHPs made of coniferaldehyde and carboxylic ferulic acid exhibited higher hydrophobicity than the coniferyl alcohol DHP. A structural characterization with (13)C NMR revealed major differences between the coniferyl alcohol-based polymer and the coniferaldehyde/ferulic acid polymers, such as the predominance of aliphatic double bonds and the lack of certain benzylic structures in the latter cases. The biological role of the reduction at the gamma-carbon during monolignol biosynthesis with regard to lignin polymerization is discussed.
Anders Holmgren; Magnus Norgren; Liming Zhang; Gunnar Henriksson
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Publication Detail:
Type:  Journal Article     Date:  2008-12-04
Journal Detail:
Title:  Phytochemistry     Volume:  70     ISSN:  0031-9422     ISO Abbreviation:  Phytochemistry     Publication Date:  2009 Jan 
Date Detail:
Created Date:  2009-02-09     Completed Date:  2009-05-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0151434     Medline TA:  Phytochemistry     Country:  United States    
Other Details:
Languages:  eng     Pagination:  147-55     Citation Subset:  IM    
Division of Wood Chemistry, Department of Fibre and Polymer Technology, Royal Institute of Technology, KTH, Teknikringen 56, Stockholm, Sweden.
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MeSH Terms
Chromatography, Gel
Lignin / chemistry*,  metabolism*
Magnetic Resonance Spectroscopy
Molecular Structure
Reg. No./Substance:

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