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L. Akim, D. Argyropoulos, L. Jouanin, J Leple, G. Pilate, B. Pollet, C. Lapierre--Milled wood lignins isolated from genetically modified poplar trees were studied by quantitative 31 P NMR spectroscopy, in combination with thioacidolysis and mild alkaline hydrolysis. The genetic transformation of the trees included down regulation of cinnamyl alcohol dehydrogenase (CAD) and bispecific caffeic acid/5- hydroxyferulic acid O-methyl transferase (COMT) enzyme activities. These analyses confirmed that moderate CAD down-regulation does not substantially alter the structure of lignin. In contrast, severe CAD deficiency was found to alter the lignin structure more profoundly by decreasing the syringyl/guaiacyl ratio and increasing the degree of condensation. The most severe alterations were observed in the lignins from the COMT-transformed lines.
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31 P NMR Spectroscopy of Lignins from Transgenic Poplars, 2000 Pulping / Process & Product Quality C
