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Micro- and Nanofibrillated Cellulose from Annual Plant-Sourced Fibers: Comparison between Enzymatic Hydrolysis and Mechanical Refining

Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess

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  • Title:
    Micro- and Nanofibrillated Cellulose from Annual Plant-Sourced Fibers: Comparison between Enzymatic Hydrolysis and Mechanical Refining
  • Author: Aguado, Roberto J ; Tarrés Farrés, Joaquim Agustí ; Pèlach Serra, Maria Àngels ; Mutjé Pujol, Pere ; Fuente González, Elena de la ; Sanchez-Salvador, José Luis ; Negro Álvarez, Carlos ; Delgado Aguilar, Marc
  • Subjects: Cellulose fibers ; Fibres de cel·lulosa ; Materials nanoestructurats ; Nanostructured materials
  • Description: The current trends in micro-/nanofibers offer a new and unmissable chance for the recovery of cellulose from non-woody crops. This work assesses a technically feasible approach for the production of micro- and nanofibrillated cellulose (MNFC) from jute, sisal and hemp, involving refining and enzymatic hydrolysis as pretreatments. Regarding the latter, only slight enhancements of nanofibrillation, transparency and specific surface area were recorded when increasing the dose of endoglucanases from 80 to 240 mg/kg. This supports the idea that highly ordered cellulose structures near the fiber wall are resistant to hydrolysis and hinder the diffusion of glucanases. Mechanical MNFC displayed the highest aspect ratio, up to 228 for hemp. Increasing the number of homogenization cycles increased the apparent viscosity in most cases, up to 0.14 Pa·s at 100 s−1 (1 wt.% consistency). A shear-thinning behavior, more marked for MNFC from jute and sisal, was evidenced in all cases. We conclude that, since both the raw material and the pretreatment play a major role, the unique characteristics of non-woody MNFC, either mechanical or enzymatically pretreated (low dose), make it worth considering for large-scale processes Authors wish to acknowledge the financial support of the Spanish Ministry of Economy and Competitiveness to the project NANOPROSOST (CTQ2017-85654-C2-1-R and CTQ2017-85654-C2-2-R)
  • Publisher: MDPI (Multidisciplinary Digital Publishing Institute)
  • Creation Date: 2022-05
  • Language: English
  • Source: DUGiDocs (Universitat de Girona)
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