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Carbohydrates are an essential part of the diet in humans and animals. Grains, fruits, and vegetables are natural sources of carbohydrates that provide energy to the body, particularly through glucose, a simple sugar that is a component of starch and an ingredient in many staple foods. The stoichiometric formula (CH2O)n, where n is the number of carbons in the molecule represents carbohydrates. In other words, the ratio of carbon to hydrogen to oxygen is 1:2:1 in carbohydrate molecules. This...
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Looking at hydrogen bonds in cellulose.

Yoshiharu Nishiyama1, Paul Langan, Masahisa Wada

  • 1CERMAV-CNRS, BP 53, 38041 Grenoble CEDEX 9, France. yoshi@cermav.cnrs.fr

Acta Crystallographica. Section D, Biological Crystallography
|November 3, 2010
PubMed
Summary

High-resolution X-ray and neutron diffraction revealed hydrogen atom positions in cellulose crystals. Hydrogen bonding is crucial for stabilizing cellulose III, preventing its collapse into cellulose I.

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Area of Science:

  • Materials Science
  • Crystallography
  • Polymer Science

Background:

  • Cellulose crystal allomorphs exhibit distinct structures and properties.
  • Understanding hydrogen bonding is key to explaining cellulose stability and transformations.
  • Previous studies have utilized X-ray diffraction but lacked detailed hydrogen atom localization.

Purpose of the Study:

  • To precisely locate hydrogen atom positions in cellulose crystal allomorphs.
  • To investigate the role of hydrogen bonding in stabilizing different cellulose forms.
  • To compare hydrogen bond geometries across various cellulose allomorphs.

Main Methods:

  • High-resolution X-ray fiber diffraction.
  • Neutron fiber diffraction.
  • Fourier difference map analysis (F(d)-F(h)) for hydrogen atom localization.

Main Results:

  • Identified distinct hydrogen atom positions involved in hydrogen bonding.
  • Observed clear hydrogen atom positions in Fourier difference maps.
  • Neutron diffraction data indicated hydrogen-bonding disorder in native cellulose despite high crystallinity.
  • Hydrogen bond geometries varied significantly between cellulose allomorphs.

Conclusions:

  • Hydrogen bonding is essential for stabilizing cellulose III, the activated form.
  • Hydrogen bonding prevents the collapse of cellulose III back to the more stable cellulose I allomorph.
  • While important, hydrogen bonding may not be the primary factor stabilizing cellulose I.