According to the strictest and traditional definition, lignin is a polymer of the hydroxycinnamyl alcohols, p-coumaryl, coniferyl, and sinapyl alcohol.  Increasingly, however, it is being found that other compounds can serve as nucleation sites or be fully integrated into the lignin polymer. These non-canonical compounds may be the result of natural mutations, induced genetic modifications or through naturally occurring lignin monomers. Examples of the latter include caffeyl alcohol, found in various seed coats, hydroxystilbenes (especially piceatannol) identified in lignins from palm fruit endocarps, hydroxystilbene glucosides from spruce bark, diferuloylputrescine in maize kernels, and tricin from wheat straw and other monocotyledons.  Indeed, it has been recently reported that 35 different monomers have been detected in natural lignins. The current work reports on the thermodynamics of coupling between monolignols and the new lignin monomers and bond dissociation energies of the resultant complexes by the application of density functional theory calculations.  <br/>

Coupling and reactions of monolignols and new lignin monomers: Density functional study

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.