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Journal Article
Research Support, Non-U.S. Gov't
Extent of incorporation of hydroxycinnamaldehydes into lignin in cinnamyl alcohol dehydrogenase-downregulated plants.
Journal of Biotechnology 2000 April 15
Down-regulation of cinnamyl alcohol dehydrogenase leads to an accumulation of cinnamaldehydes available for incorporation into the developing lignin polymer. Using electron spin resonance spectroscopy we have demonstrated that the parent radical of 4-hydroxy-3-methoxycinnamaldehyde is generated by peroxidase catalysed oxidation. The extent of radical generation is similar to that of 4-hydroxy-3-methoxycinnamyl alcohol and is increased by further aromatic methoxylation. From the distribution of the electron-spin density, it was predicted that the regiochemistry of 4-hydroxy-3-methoxycinnamaldehyde coupling would be similar to that of the corresponding alcohol, with the possibility of a higher degree of 8-O-4 linkages occurring. These predictions were confirmed by polymerisation studies, which also showed that after radical coupling the alpha,beta-enone structure was regenerated. This suggests that, although the cross-linking and physical properties of cinnamaldeyde rich lignins differ from that of normal lignins, cinnamaldehydes are incorporated into the lignin polymer under the same controlling factors as the cinnamyl alcohols.
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