The Shape of Native Plant Cellulose Microfibrils

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • James Kubicki
  • Hui Yang
  • Daisuke Sawada

  • Hugh O'Neill
  • Daniel Oehme
  • Daniel Cosgrove

Research units

  • Oak Ridge National Laboratory
  • University of Texas at El Paso
  • Pennsylvania State University

Abstract

Determining the shape of plant cellulose microfibrils is critical for understanding plant cell wall molecular architecture and conversion of cellulose into biofuels. Only recently has it been determined that these cellulose microfibrils are composed of 18 cellulose chains rather than 36 polymers arranged in a diamond-shaped pattern. This study uses density functional theory calculations to model three possible habits for the 18-chain microfibril and compares the calculated energies, structures, 13C NMR chemical shifts and WAXS diffractograms of each to evaluate which shape is most probable. Each model is capable of reproducing experimentally-observed data to some extent, but based on relative theoretical energies and reasonable reproduction of all variables considered, a microfibril based on 5 layers in a 34443 arrangement is predicted to be the most probable. A habit based on a 234432 arrangement is slightly less favored, and a 6 × 3 arrangement is considered improbable.

Details

Original languageEnglish
Article number13983
JournalScientific Reports
Volume8
Issue number1
Early online date2018
Publication statusPublished - 1 Dec 2018
MoE publication typeA1 Journal article-refereed

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