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Wood Research and Technology

Holzforschung

Cellulose – Hemicelluloses – Lignin – Wood Extractives

Editor-in-Chief: Faix, Oskar / Salmén, Lennart

Editorial Board: Daniel, Geoffrey / Militz, Holger / Rosenau, Thomas / Sixta, Herbert / Vuorinen, Tapani / Argyropoulos, Dimitris S. / Balakshin, Yu / Barnett, J. R. / Burgert, Ingo / Rio, Jose C. / Evans, Robert / Evtuguin, Dmitry V. / Frazier, Charles E. / Fukushima, Kazuhiko / Gindl-Altmutter, Wolfgang / Glasser, W. G. / Holmbom, Bjarne / Isogai, Akira / Kadla, John F. / Koch, Gerald / Lachenal, Dominique / Laine, Christiane / Mansfield, Shawn D. / Morrell, J.J. / Niemz, Peter / Potthast, Antje / Ragauskas, Arthur J. / Ralph, John / Rice, Robert W. / Salin, Jarl-Gunnar / Schmitt, Uwe / Schultz, Tor P. / Sipilä, Jussi / Takano, Toshiyuki / Tamminen, Tarja / Theliander, Hans / Welling, Johannes / Willför, Stefan / Yoshihara, Hiroshi

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1437-434X
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Volume 65, Issue 2

Issues

Organosolv pretreatment of olive tree biomass for fermentable sugars

Manuel J. Díaz
  • Department of Chemical, Environmental and Materials Engineering, Campus Las Lagunillas, University of Jaén, Jaén, Spain
  • Other articles by this author:
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/ Wouter J.J. Huijgen
  • Energy Research Centre of the Netherlands (ECN), Biomass, Coal and Environmental Research Unit, Petten, The Netherlands
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/ Ron R. van der Laan
  • Energy Research Centre of the Netherlands (ECN), Biomass, Coal and Environmental Research Unit, Petten, The Netherlands
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/ Johannes H. Reith
  • Energy Research Centre of the Netherlands (ECN), Biomass, Coal and Environmental Research Unit, Petten, The Netherlands
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/ Cristóbal Cara
  • Department of Chemical, Environmental and Materials Engineering, Campus Las Lagunillas, University of Jaén, Jaén, Spain
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/ Eulogio Castro
  • Department of Chemical, Environmental and Materials Engineering, Campus Las Lagunillas, University of Jaén, Jaén, Spain
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Published Online: 2011-02-07 | DOI: https://doi.org/10.1515/hf.2011.030

Abstract

Olive tree pruning biomass is one of the main agricultural residues available in Mediterranean countries and is currently lacking commercial applications. To take advantage of its sugar content, a pretreatment is necessary to enhance enzyme accessibility of the cellulose fraction of the residue. This paper describes for the first time the use of organosolv pretreatment in this regard. The main process variables such as pretreatment temperature, residence time, and solvent composition (aqueous ethanol) are studied. Results show that organosolv pretreatment causes delignification and hydrolysis of hemicelluloses and improves the enzymatic digestibility of olive tree pruning biomass. A higher pretreatment severity and ethanol content of the solvent were found to increase delignification (up to 64% at 66% w/w aqueous ethanol, 210°C, 60 min). By contrast, xylan hydrolysis was promoted by a lower ethanol content (maximum 92%). The highest enzymatic hydrolysis yield (90% of the structural glucan present in the raw material) has been obtained after pretreatment with 43% w/w aqueous ethanol at 210°C for 15 min. Organosolv pretreatment was found to be the most effective pretreatment for enzymatic hydrolysis of olive tree pruning biomass.

Keywords: enzymatic hydrolysis; fermentable sugars; olive tree pruning biomass; organosolv pretreatment

About the article

Corresponding author. Department of Chemical, Environmental and Materials Engineering, Campus Las Lagunillas, University of Jaén, 23071 Jaén, Spain Phone: +34-95-3212163


Received: 2010-07-07

Accepted: 2010-10-27

Published Online: 2011-02-07

Published Online: 2011-02-07

Published in Print: 2011-03-01


Citation Information: Holzforschung, Volume 65, Issue 2, Pages 177–183, ISSN (Online) 1437-434X, ISSN (Print) 0018-3830, DOI: https://doi.org/10.1515/hf.2011.030.

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