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Related Experiment Video

Updated: Oct 22, 2025

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Microwave-Assisted Defibrillation of Microalgae.

Frederik L Zitzmann1, Ewan Ward1, Xiangju Meng1

  • 1Green Chemistry Centre of Excellence, Department of Chemistry, University of York, York YO10 5DD, UK.

Molecules (Basel, Switzerland)
|August 27, 2021
PubMed
Summary

Researchers developed a novel, eco-friendly method to produce defibrillated cellulose from microalgae using hydrothermal microwave processing. This sustainable approach yields valuable cellulosic materials for diverse industrial applications.

Keywords:
defibrillated cellulosemicroalgaemicrowave processingzero waste biorefinery

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Area of Science:

  • Materials Science
  • Biomass Conversion
  • Sustainable Chemistry

Background:

  • Microalgal biomass is a rich source of cellulose, but efficient, environmentally friendly extraction methods are limited.
  • Existing cellulose processing often involves harsh chemicals (acids, TEMPO, bleach) and energy-intensive steps.
  • Spent microalgal biomass from lipid extraction presents an underutilized resource for valuable material production.

Purpose of the Study:

  • To report the first production of defibrillated cellulose from microalgal biomass using an acid-free, TEMPO-free, and bleach-free hydrothermal microwave process.
  • To investigate two processing routes: direct microwave treatment and supercritical carbon dioxide (scCO2) pre-treatment followed by microwave processing.
  • To characterize the resulting cellulosic materials and assess their potential for hydrogel formation.

Main Methods:

  • Hydrothermal microwave processing of native microalgae at temperatures ranging from 160 °C to 220 °C.
  • Pre-treatment of microalgal biomass using supercritical carbon dioxide (scCO2) followed by microwave processing.
  • Characterization using X-ray Diffraction (XRD) to determine crystallinity and morphology, and assessment of water holding capacity (WHC).

Main Results:

  • Defibrillated cellulosic strands were successfully produced via both processing routes.
  • Increasing microwave processing temperature reduced the width and length of cellulosic strands, yielding microfibrillated cellulose and nanocrystals at 220 °C.
  • Crystallinity index (CrI) increased with temperature; water holding capacity remained consistent at ~4.5 g H2O/g.
  • Partially stable hydrogels were formed from materials processed above 200 °C at 3 wt% concentration.

Conclusions:

  • A novel, sustainable method for producing defibrillated cellulose from microalgae was established, avoiding harsh chemicals.
  • The process yields cellulosic materials with tunable morphology (microfibrils to nanocrystals) dependent on temperature.
  • The developed materials demonstrate potential for hydrogel formation and applications in packaging, food, pharmaceutical, and cosmetic industries.