Separation of polysaccharides from rice husk and wheat bran using solvent system consisting of BMIMOAc and DMI

Carbohydr Polym. 2015 Nov 20:133:517-23. doi: 10.1016/j.carbpol.2015.07.059. Epub 2015 Jul 23.

Abstract

A solvent system consisting of 1,3-dimethyl-2-imidazolidinone (DMI), and ionic liquid 1-butyl-3-methylimidazolium acetate (BMIMOAc) was used to separate polysaccharides from rice husk and wheat bran. The effects of the DMI/BMIMOAc ratios, temperature, and time on the dissolution of rice husk and wheat bran were investigated, and the influence of anti-solvents on the regeneration of polysaccharides-rich material was evaluated. We found that the solvent system is more powerful to dissolve rice husk and wheat bran than pure BMIMOAc, and that polysaccharides-rich material can be effectively separated from the biomass solution. The polysaccharides content of regenerated material from wheat bran can reach as high as 94.4% when ethanol was used as anti-solvents. Under optimized conditions, the extraction rate of polysaccharides for wheat bran can reach as high as 71.8% at merely 50°C. The recycled solvent system exhibited constant ability to separate polysaccharides from rice husk and wheat bran.

Keywords: Dissolution; Polysaccharides; Separation; Solvent system.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biomass
  • Chemical Fractionation / methods*
  • Dietary Fiber*
  • Imidazoles / chemistry*
  • Molecular Weight
  • Oryza / chemistry*
  • Polysaccharides / chemistry
  • Polysaccharides / isolation & purification*
  • Solvents / chemistry*
  • Temperature
  • Time Factors
  • Viscosity

Substances

  • 1-butyl-3-methylimidazolium
  • Dietary Fiber
  • Imidazoles
  • Polysaccharides
  • Solvents
  • 1,3-dimethyl-2-imidazolidinone