File Name: constitution and biosynthesis of lignin .zip
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Lignin has a significant and largely unrealized potential as a source for the sustainable production of fuels and bulk high-value chemicals. It can replace fossil-based oil as a renewable feedstock that would bring about socio-economic and environmental benefits in our transition to a biobased economy. The efficient utilization of lignin however requires its depolymerization to low-molecular weight phenolics and aromatics that can then serve as the building blocks for chemical syntheses of high-value products. Here, we review the recent progress in lignin biodegradation with laccase-mediator systems, and research needs that need to be addressed in this field. Lignocellulosic biomass is the single renewable resource on earth, reproduced at 60 billion tons as organically bound carbon per year, which has the potential to create a sustainable energy future.
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Plant Carbohydrates II pp Cite as. The origin of lignins in plant tissues is closely related to plant evolution. Land plants, which are believed to have been derived from the Psilophytales during the Silurian to Devonian eras, are always subjected to the mechanical stresses of gravity, winds, and rains, and they have acquired strong supporting organs, such as vascular bundles composed of phloem and xylem. Xylem is comprised of wood fibers, tracheids, and vessels reinforced with lignins. The roles of lignins, which are aromatic polymers, in xylem tissues are: 1 to impart rigidity to the cell walls and enable terrestrial plants to develop large upright forms resistant to various stresses, 2 to assist in the smooth transportation of solutes by decreasing the permeability of cell walls in the conductive xylem tissues, and 3 to resist attack by microorganisms.
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