what is lignin and what are its function?
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Lignin is a constituent of the cell walls of almost all dry land plant cell walls. It is the second most abundant natural polymer in the world, surpassed only by cellulose. Of the polymers found in plant cell walls, lignin is the only one that is not composed of carbohydrate (sugar) monomers.Lignin is unique in that it is the only large-scale biomass source of an aromatic functionality. It is composed of up to three different phenyl propane monomers, shown in Figure 1, depending on the species. Coniferyl alcohol occurs in all species and is the dominant monomer in conifers (softwoods). Deciduous (hardwood) species contain up to 40% syringyl alcohol units while grasses and agricultural crops may also contain coumaryl alcohol units.
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