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Wheat straw autohydrolysis: process optimization and products characterization.

Florbela Carvalheiro1, Talita Silva-Fernandes, Luís C Duarte

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Autohydrolysis of wheat straw effectively separates hemicellulose, yielding valuable xylooligosaccharides and enriched glucan solids. This process optimizes biomass utilization for diverse industrial applications.

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Area of Science:

  • Biomass valorization
  • Green chemistry
  • Biochemical engineering

Background:

  • Wheat straw is an abundant lignocellulosic biomass.
  • Hemicellulose is a key component for producing valuable compounds.
  • Selective hydrolysis is crucial for efficient biomass fractionation.

Purpose of the Study:

  • To optimize autohydrolysis conditions for selective hemicellulose hydrolysis from wheat straw.
  • To maximize the recovery of hemicellulose-derived sugars, particularly xylooligosaccharides.
  • To evaluate the enrichment of glucan in the solid residue for further processing.

Main Methods:

  • Autohydrolysis treatments of wheat straw at varying temperatures (150-240°C).
  • Evaluation of liquid and solid phase compositions using the severity factor (log R0).
  • Quantification of sugars, acetyl groups, glucan, and lignin content.

Main Results:

  • Optimal conditions (log R0 = 3.96) yielded 64% of original (arabino)xylan, with 80% as xylooligosaccharides.
  • High solubilization of xylan (58%), arabinan (83%), and acetyl groups (98%) was achieved.
  • Glucan was retained in the solid phase (max 16% solubilization), enriching it to 61% glucan; delignification was <15%.

Conclusions:

  • Autohydrolysis is effective for selective hemicellulose fractionation from wheat straw.
  • The liquid stream is suitable for fermentation or xylooligosaccharide production.
  • The glucan-enriched solid phase has potential for applications like biofuel production.