Cellulose

, Volume 25, Issue 1, pp 37–48 | Cite as

Characterization of cellulose crystallinity after enzymatic treatment using Fourier transform infrared spectroscopy (FTIR)

  • Nathan Kruer-Zerhusen
  • Borja Cantero-Tubilla
  • David B. Wilson
Original Paper
  • 136 Downloads

Abstract

Cellulase activity on insoluble cellulose substrates declines as the substrate is modified. The role of structural changes that result in substrate recalcitrance, such as changes to cellulose crystallinity, requires further investigation. Crystallinity of cellulose samples with varying extents of digestion can only be compared meaningfully using a high throughput - Fourier transform infrared spectroscopy (HTS-FTIR) technique when the many variables involved are carefully controlled. Hence, changes to the HTS-FTIR sample preparation methods previously described in literature were necessary in order to obtain clean raw spectra and reliable measures of cellulose crystallinity. The sample preparation methods of residual cellulose after digestion by individual cellulases and a complex cellulase mixture from T. fusca were improved to remove extraneous overlapping signals, provide accurate extent of digestion, and correct errors caused by varying concentrations. These improved preparation methods enabled measurement of crystallinity index values of residual cellulose which did not show a correlation between cellulose crystallinity and the decline in cellulase activity.

Keywords

Cellulose Crystallinity Recalcitrance Cellulase Thermobifida fusca Fourier Transform Infrared (FTIR) spectroscopy Crystallinity indexes 

Notes

Acknowledgments

The authors thank Prof. Larry Walker from Cornell University. Work was funded by a grant from the US Department of Energy BioEnergy Science Center (BESC). The research was supported by a fellowship from Obra Social “La Caixa”.

Supplementary material

10570_2017_1542_MOESM1_ESM.docx (1.2 mb)
Supplementary material 1 (DOCX 1212 kb)

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2017

Authors and Affiliations

  • Nathan Kruer-Zerhusen
    • 1
  • Borja Cantero-Tubilla
    • 2
  • David B. Wilson
    • 1
  1. 1.Department of Molecular Biology and GeneticsCornell UniversityIthacaUSA
  2. 2.Robert Frederick Smith School of Chemical and Biomolecular EngineeringCornell UniversityIthacaUSA

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