Isolation and characterization of lignocellulose nanofibers from different wheat straw pulps

Rafael Sánchez, Eduardo Espinosa*, Juan Domínguez-Robles, Javier Mauricio Loaiza, Alejandro Rodríguez

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)

Abstract

Wheat straw was cooked under different pulping processes: Soda (100 °C, 7% NaOH, 150 min), Kraft (170 °C, 16% alkalinity, 25% sulfidity, 40 min) and Organosolv (210 °C, 60% ethanol, 60 min). Once the pulps were obtained, lignocellulose nanofibers (LCNF) were isolated by mechanical process and TEMPO-mediated oxidation followed by a high pressure homogenization. After pulping process, the different pulps were characterized and its chemical composition was determined. The pulps characterization indicates that the Soda process is the process that, despite producing less delignification, retains much of the hemicelluloses in the pulp, being this content a key factor in the nanofibrillation process. Regarding the LCNF obtained by mechanical process, those nanofibers isolated from Organosolv wheat pulp (OWP) and Kraft wheat pulp (KWP) show low values for nanofibrillation yield, specific surface area and greater diameter. However, those nanofibers isolated from Soda wheat pulp (SWP) reach much higher values for these parameters and presents a diameter of 14 nm, smaller than those obtained by TEMPO-mediated oxidation from OWP. Smaller diameters are generally obtained in TEMPO-oxidized LCNF. This work concludes that the lignin content does not affect greatly to obtain LCNF as does the hemicellulose content, so it is accurate to use a soft pulping process.

Original languageEnglish
Pages (from-to)1025-1033
Number of pages9
JournalInternational Journal of Biological Macromolecules
Volume92
Early online date08 Aug 2016
DOIs
Publication statusPublished - Nov 2016

Keywords

  • Characterization
  • Kraft
  • Lignocellulose nanofiber
  • Organosolv
  • Soda
  • Wheat straw

ASJC Scopus subject areas

  • Structural Biology
  • Biochemistry
  • Molecular Biology

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