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Cellulose and Pectic Polysaccharides01:15

Cellulose and Pectic Polysaccharides

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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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Towards Biomimicking Wood: Fabricated Free-standing Films of Nanocellulose, Lignin, and a Synthetic Polycation
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Biodegradation of Functionalized Nanocellulose.

Benjamin P Frank1, Casey Smith1, Emily R Caudill2

  • 1Department of Chemistry, Johns Hopkins University, 3400 N Charles Street, Baltimore, Maryland 21218, United States.

Environmental Science & Technology
|July 20, 2021
PubMed
Summary
This summary is machine-generated.

Functionalizing nanocellulose with esters, carboxylic acids, or ethers reduces its biodegradability. Surface chemistry, not bulk modification, dictates the environmental persistence of these advanced biomaterials.

Keywords:
anaerobic digestionbiomethane potential testsdegree of substitutionesterificationmodified Gompertz modelnanoparticlesurface chemistry

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Area of Science:

  • Materials Science
  • Biotechnology
  • Environmental Science

Background:

  • Nanocellulose offers unique properties for materials science and biomedical applications.
  • Covalent functionalization enhances nanocellulose dispersibility but may compromise biodegradability.
  • Pristine nanocellulose is highly biodegradable, a key environmental advantage.

Purpose of the Study:

  • To investigate the impact of surface functionalization on nanocellulose biodegradability.
  • To compare the mineralization rates of various functionalized nanocellulose types.
  • To determine the relationship between surface chemistry and environmental persistence.

Main Methods:

  • Synthesized cellulose nanofibrils (CNFs) with ester, carboxylic acid, and ether modifications.
  • Assessed biodegradation rates using anaerobic and aerobic microbial communities.
  • Quantified the degree of substitution at the surface and bulk of modified CNFs.

Main Results:

  • Functionalized CNFs showed reduced biodegradation rates and extents compared to unmodified CNFs.
  • Etherified CNFs exhibited the highest recalcitrance to microbial degradation.
  • Biodegradability reduction correlated with the degree of surface substitution, not bulk modification.

Conclusions:

  • Surface chemistry is critical in determining the environmental persistence of functionalized nanocellulose.
  • Microbial interaction with the nanocellulose surface is essential for biodegradation.
  • Quantifying surface substituents is necessary to predict the environmental fate of modified nanocellulose.