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Cellulose and Pectic Polysaccharides01:15

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 Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth.  Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
As a cell matures, its cell wall specializes according to its type. For example, the...
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High-throughput Screening of Recalcitrance Variations in Lignocellulosic Biomass: Total Lignin, Lignin Monomers, and Enzymatic Sugar Release
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Cellulose Aggregation under Hydrothermal Pretreatment Conditions.

Rodrigo L Silveira1, Stanislav R Stoyanov2,3,4,5, Andriy Kovalenko2,4

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Area of Science:

  • Biomass modification and biofuel production
  • Sustainable biopolymer utilization
  • Lignocellulosic material processing

Background:

  • Cellulose, a key biopolymer for biofuels, requires modification for efficient depolymerization.
  • Solvents are crucial in thermochemical treatments, but molecular mechanisms remain unclear.
  • Understanding solvent-biomass interactions is vital for optimizing biofuel production.

Purpose of the Study:

  • To analyze the role of water in cellulose aggregation during biomass modification.
  • To investigate how thermodynamic conditions affect cellulose-water interactions.
  • To elucidate the molecular basis of biomass changes during pretreatment.

Main Methods:

  • Utilized the 3D-RISM-KH molecular theory of solvation.
  • Analyzed hydration shells and cellulose aggregation under varying conditions.
  • Compared cellulose-water and cellulose-cellulose interactions.

Main Results:

  • Ambient conditions promote structured hydration shells, preventing cellulose aggregation.
  • Hydrothermal conditions disrupt hydration shells, favoring cellulose aggregation.
  • Reduced cellulose-water interactions lead to increased cellulose-cellulose attraction.

Conclusions:

  • Water's structured hydration shells protect cellulose microfibrils at ambient conditions.
  • Hydrothermal pretreatments decrease water structuring, promoting cellulose aggregation.
  • This explains increased crystallite size and advances understanding of biomass modification mechanisms.