Abstract
The mechanism of lignin carbohydrate complex formation by addition of polysaccharides on quinone methide (QM) generated during lignin polymerisation was investigated using a model approach. Dehydrogenation polymers (DHPs, lignin model compounds) were synthesized from coniferyl alcohol in the presence of a glucuronoarabinoxylan (GAX) extracted from oat spelts, by Zutropfverfahren (ZT) and Zulaufverfahren (ZL) methods. The methods ZT and ZL differed in their distribution of QM over the reaction period but generated roughly the same QM amount. Steric exclusion chromatography of the ZT and ZL reaction products showed that only the ZT reaction produced high molar mass compounds. Covalent linkages in the ZT reaction involving ether bonds between GAX moiety and α carbon of the lignin monomer were confirmed by 13C NMR and xylanase-based fractionation. The underlying phenomena were further investigated by examining the interactions between GAX and DHP in sorption experiments. GAX and DHPs were shown to interact to form hydrophobic aggregates. In the ZT process, slow addition permitted polymer reorganisation which led to dehydration around the lignin-like growing chains thereby limiting the addition of water on the quinone methide formed during polymerisation and thus favoured lignin–carbohydrate complex (LCC) formation.
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- CA:
-
Coniferyl alcohol
- CPMAS:
-
Cross polarization magic angle spinning
- DHP:
-
Dehydrogenation polymer
- DMSO:
-
Dimethyl sulfoxide
- GAX:
-
Glucuronoarabinoxylan
- HPAEC:
-
High-pressure anion exchange chromatography
- LCC:
-
Lignin–carbohydrate complex
- LiBr:
-
Lithium bromide
- NMR:
-
Nuclear magnetic resonance
- QM:
-
Quinone methide
- SEC:
-
Steric-exclusion chromatography
- ZL:
-
Zulaufverfahren
- ZT:
-
Zutropfverfahren
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Acknowledgments
Access to the NMR facilities of the BIBS platform (Biopolymers, Interactions, Structural Biology) of INRA-Nantes was greatly appreciated by the authors.
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Barakat, A., Winter, H., Rondeau-Mouro, C. et al. Studies of xylan interactions and cross-linking to synthetic lignins formed by bulk and end-wise polymerization: a model study of lignin carbohydrate complex formation. Planta 226, 267–281 (2007). https://doi.org/10.1007/s00425-007-0479-1
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DOI: https://doi.org/10.1007/s00425-007-0479-1