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Cell-wall structural changes in wheat straw pretreated for bioethanol production

Authors
  • Kristensen, Jan B1
  • Thygesen, Lisbeth G1
  • Felby, Claus1
  • Jørgensen, Henning1
  • Elder, Thomas2
  • 1 University of Copenhagen, Forest and Landscape Denmark, Rolighedsvej 23, Frederiksberg, DK-1958, Denmark
  • 2 USDA-Forest Service, Southern Research Station, Utilization of Southern Forest Products, Shreveport Highway, Pineville, LA, 71360, USA , Pineville
Type
Published Article
Journal
Biotechnology for Biofuels
Publisher
Springer (Biomed Central Ltd.)
Publication Date
Apr 16, 2008
Volume
1
Issue
1
Identifiers
DOI: 10.1186/1754-6834-1-5
Source
Springer Nature
Keywords
License
Green

Abstract

BackgroundPretreatment is an essential step in the enzymatic hydrolysis of biomass and subsequent production of bioethanol. Recent results indicate that only a mild pretreatment is necessary in an industrial, economically feasible system. The Integrated Biomass Utilisation System hydrothermal pretreatment process has previously been shown to be effective in preparing wheat straw for these processes without the application of additional chemicals. In the current work, the effect of the pretreatment on the straw cell-wall matrix and its components are characterised microscopically (atomic force microscopy and scanning electron microscopy) and spectroscopically (attenuated total reflectance Fourier transform infrared spectroscopy) in order to understand this increase in digestibility.ResultsThe hydrothermal pretreatment does not degrade the fibrillar structure of cellulose but causes profound lignin re-localisation. Results from the current work indicate that wax has been removed and hemicellulose has been partially removed. Similar changes were found in wheat straw pretreated by steam explosion.ConclusionResults indicate that hydrothermal pretreatment increases the digestibility by increasing the accessibility of the cellulose through a re-localisation of lignin and a partial removal of hemicellulose, rather than by disruption of the cell wall.

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