Brewers' spent grain (BSG) is the most abundant by-product of the brewing process. BSG is currently disposed of or used as a supplement for animal feed, although it contains significant amounts of bioactive compounds of great interest to the pharmaceutical, cosmetic and food sectors. In this study we investigate the feasibility of using a simple solvent extraction procedure to recover phenolic antioxidants from BSG. Acetone-water and ethanol-water mixtures were used as extraction solvents. Phenolic extracts obtained by treatment of BSG with the two solvent systems were characterized in terms of total phenolics and antioxidant activity. For both systems, the extraction yield was maximum at 60% (v/v) organic solvent concentration. At all solvent compositions, mixtures containing acetone provided higher extraction yields. As suggested by the strong correlation between the antioxidant activity of BSG extracts and their phenolic content, the antioxidant capacity of the extracts can be mainly attributed to polyphenols. Overall, the obtained results strongly support the exploitation of BSG as a source of phenolic antioxidants and the possibility of recovering them by a mild and green extraction process.

Water-organic solvent extraction of phenolic antioxidants from brewers' spent grain / Zuorro, Antonio; Iannone, Annalaura; Lavecchia, Roberto. - In: PROCESSES. - ISSN 2227-9717. - 7:3(2019), pp. 1-11. [10.3390/pr7030126]

Water-organic solvent extraction of phenolic antioxidants from brewers' spent grain

Zuorro, Antonio
Primo
Methodology
;
Iannone, Annalaura
Secondo
Investigation
;
Lavecchia, Roberto
Ultimo
Methodology
2019

Abstract

Brewers' spent grain (BSG) is the most abundant by-product of the brewing process. BSG is currently disposed of or used as a supplement for animal feed, although it contains significant amounts of bioactive compounds of great interest to the pharmaceutical, cosmetic and food sectors. In this study we investigate the feasibility of using a simple solvent extraction procedure to recover phenolic antioxidants from BSG. Acetone-water and ethanol-water mixtures were used as extraction solvents. Phenolic extracts obtained by treatment of BSG with the two solvent systems were characterized in terms of total phenolics and antioxidant activity. For both systems, the extraction yield was maximum at 60% (v/v) organic solvent concentration. At all solvent compositions, mixtures containing acetone provided higher extraction yields. As suggested by the strong correlation between the antioxidant activity of BSG extracts and their phenolic content, the antioxidant capacity of the extracts can be mainly attributed to polyphenols. Overall, the obtained results strongly support the exploitation of BSG as a source of phenolic antioxidants and the possibility of recovering them by a mild and green extraction process.
2019
Brewers' spent grain; phenolic compounds; solvent extraction; waste valorization; bioengineering; chemical engineering (miscellaneous); process chemistry and technology
01 Pubblicazione su rivista::01a Articolo in rivista
Water-organic solvent extraction of phenolic antioxidants from brewers' spent grain / Zuorro, Antonio; Iannone, Annalaura; Lavecchia, Roberto. - In: PROCESSES. - ISSN 2227-9717. - 7:3(2019), pp. 1-11. [10.3390/pr7030126]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1265012
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