화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.102, 370-383, October, 2021
DOI10.1016/j.jiec.2021.07.020  Export Citation
Pressurized liquid extraction of brewer’s spent grain: Kinetics and crude extracts characterization
Giulia Herbst, Fabiane Hamerski, Massimiliano Errico1, and Marcos L. Corazza†
  • Department of Chemical Engineering, Federal University of Paraná, Francisco H. Santos Av. 100, 81531-990 Curitiba, PR, Brazil
  • 1Department of Green Technology, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark
E-mail:
In this study, extraction yield of valuable compounds from brewer’s spent grain (BSG) using pressurized liquid extraction (PLE) was investigated varying temperature, solvent type, and flow rate at a constant pressure. The results were compared with Soxhlet extractions using the total phenolic compounds (TPC), total flavonoid compounds (TFC), antioxidant activity (AA), reducing sugars (RS), and total reducing sugars (TRS) as indices. The highest PLE extraction yield was 20.1 wt%, at 120 °C, 2 mL/min using ethanol to water volume ratio of 0.5, at 10 MPa. The TPC, TFC, and AA content were favored by water and water/ ethanol extractions and temperature increase. The highest AA was obtained with water at 120 °C and 4 mL/min achieving 9944, 4769 and 4096 mmol TE/100 g of BSG extract, respectively. PLE was capable of present high extraction yields maintaining the RS and TRS in the BSG matrix. In addition, BSG was defatted with compressed propane before the extraction with PLE, showing that compressed propane is highly efficient in recovering the lipid fraction from BSG. The results demonstrated a great potential of water and different EtOH/Water solvent ratio at pressurized conditions for obtaining biocompounds of BSG in a crude extract with expressive biological activity.
Keywords:BSG;Pressurized liquid extraction;Green solvents;Extract characterization
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