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Related Concept Videos

Hydrolysis01:15

Hydrolysis

Overview
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Hydrolysis Reverses Dehydration Synthesis
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As a cell matures, its cell wall specializes according to its type. For example, the parenchyma cells of...

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Updated: Jun 1, 2026

Highly Stable, Functional Hairy Nanoparticles and Biopolymers from Wood Fibers: Towards Sustainable Nanotechnology
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Highly Stable, Functional Hairy Nanoparticles and Biopolymers from Wood Fibers: Towards Sustainable Nanotechnology

Published on: July 20, 2016

Restructuring the crystalline cellulose hydrogen bond network enhances its depolymerization rate.

Shishir P S Chundawat1, Giovanni Bellesia, Nirmal Uppugundla

  • 1Biomass Conversion Research Laboratory, Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, USA. chundawa@msu.edu

Journal of the American Chemical Society
|June 14, 2011
PubMed
Summary
This summary is machine-generated.

Altering cellulose crystallinity using ammonia pretreatment significantly enhances enzymatic biofuel conversion. This pretreatment modifies the hydrogen bond network, boosting saccharification rates and reducing enzyme binding, offering a novel pathway for cost-effective biofuels.

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Towards Biomimicking Wood: Fabricated Free-standing Films of Nanocellulose, Lignin, and a Synthetic Polycation
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Published on: June 17, 2014

Area of Science:

  • Biochemistry
  • Biotechnology
  • Materials Science

Background:

  • Cellulose crystallinity hinders efficient enzymatic saccharification, a key step in lignocellulose-to-biofuel conversion.
  • Understanding cellulose recalcitrance at a molecular level is crucial for improving biofuel production.

Purpose of the Study:

  • To investigate how altering the hydrogen bond network in cellulose fibrils affects cellulase activity.
  • To provide a molecular-scale explanation for enhanced enzymatic saccharification through cellulose structural modification.

Main Methods:

  • Molecular dynamics (MD) simulations to analyze changes in cellulose structure and hydrogen bonding.
  • Enzymatic assays to measure saccharification rates and cellulase binding capacity.
  • Ammonia pretreatment to transform cellulose allomorph I(β) to III(I).

Main Results:

  • Ammonia treatment converted cellulose I(β) to III(I), altering the hydrogen bond network.
  • Cellulose III(I) showed a ~50% increase in solvent-exposed glucan chain hydrogen bonds with water.
  • Saccharification rates increased up to 5-fold, approaching those of amorphous cellulose, with reduced cellulase binding capacity.

Conclusions:

  • Modifying the cellulose hydrogen bond network, specifically to cellulose III(I), enhances enzymatic deconstruction.
  • The 'amorphous-like' surface of cellulose III(I) facilitates easier glucan extraction and enzyme access.
  • This approach offers novel strategies for biofuel production by improving cellulose deconstruction and enzyme efficiency.