Extraction of Carbohydrates and Phenolics from Barley Hull using Pressurized/Subcritical Fluids

  • Author / Creator
    Sarkar, Suparna
  • Canada is one of the largest barley producers, generating barley hull which accounts for 10-13% wt of the grain. Barley hull has valuable components, such as carbohydrates and phenolics. This thesis studied the extraction of total carbohydrates and phenolics from the hull of a new barley variety (BT 584) using solid-liquid batch (SLB), subcritical fluid (sCF) and supercritical CO2 (SC-CO2) extraction methods. The optimization of the variables was performed using response surface methodology (RSM) with a central composite design. The sCF extraction was the most effective method, yielding 122.4 mg of total phenolics/g of barley hull and 589.4 mg of total carbohydrates/g of barley hull at 240°C, 15MPa, with 12% ethanol concentration, flowing at 5 mL/min. A kinetic model was used to fit the curves of the sCF extraction with mean square error lower than 0.06.

  • Subjects / Keywords
  • Graduation date
    Spring 2013
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.