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Cellulose

, Volume 25, Issue 1, pp 763–776 | Cite as

Lessons learned from the treatment of organosolv pulp with ligninolytic enzymes and chemical delignification agents

  • María García-Torreiro
  • Thelmo A. Lú-Chau
  • Beatriz Gullón
  • María Teresa Moreira
  • Juan M. Lema
  • Gemma Eibes
Original Paper

Abstract

Although organosolv pretreatment allows extensive delignification of beech wood, the residual lignin present in the pulp may hinder the subsequent hydrolysis of the cellulose into fermentable sugars. With the purpose of increasing sugar production from cellulose hydrolysis, enzymatic and chemical oxidation stages were applied to the pulp previously to a stage of enzymatic hydrolysis with cellulases. Neither lignin content was reduced, nor sugar yield was improved after the versatile peroxidase treatment. On the other hand, laccase oxidation caused an increase in total lignin and kappa number and did not influence digestibility. Similarly, the chemical oxidation with H2O2 had also a negligible impact on the sugar yield. Only a significant removal of the lignin content in fibers was attained after ethanol wash, also confirmed by FT-IR analysis, which allowed increasing cellulose digestibility by 8.4%, and reducing the phenol content of the hydrolysate by 45.5%. Although the improvement of cellulose digestibility was lower than expected, this work provides valuable lessons for practical use on the opportunities of organosolv pulp.

Keywords

Versatile peroxidase Laccase Cellulose digestibility Lignin Kappa number Organosolv 

Notes

Acknowledgments

This research was supported by the Spanish Government (Ministry of Economy and Competitiveness) through the ERA-IB2 project 2G-Enzymes (PCIN-2015-031). The authors belong to the Galician Competitive Research Group GRC2013-032 and to the CRETUS Strategic Partnership (AGRUP2015/02). All these programmes are co-funded by FEDER (EU).

Supplementary material

10570_2017_1573_MOESM1_ESM.docx (112 kb)
Supplementary material 1 (DOCX 112 kb)

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Copyright information

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

Authors and Affiliations

  1. 1.Department of Chemical Engineering, Institute of TechnologyUniversidade de Santiago de CompostelaSantiago de CompostelaSpain

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