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Pressurized liquid extraction of brewer’s spent grain: Kinetics and crude extracts characterization
Giulia Herbst,Fabiane Hamerski,Massimiliano Errico,Marcos L. Corazza 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.102 No.-
In this study, extraction yield of valuable compounds from brewer’s spent grain (BSG) using pressurizedliquid extraction (PLE) was investigated varying temperature, solvent type, and flow rate at a constantpressure. 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 reducingsugars (TRS) as indices. The highest PLE extraction yield was 20.1 wt%, at 120 C, 2 mL/min using ethanolto 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 and4 mL/min achieving 9944, 4769 and 4096 mmol TE/100 g of BSG extract, respectively. PLE was capableof present high extraction yields maintaining the RS and TRS in the BSG matrix. In addition, BSG wasdefatted with compressed propane before the extraction with PLE, showing that compressed propaneis highly efficient in recovering the lipid fraction from BSG. The results demonstrated a great potentialof water and different EtOH/Water solvent ratio at pressurized conditions for obtaining biocompoundsof BSG in a crude extract with expressive biological activity.
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