Deep eutectic solvent-based valorization of spent coffee grounds

•A simple and green method to valorize SCGs was proposed.•DESs were used as an optimal safe solvent to extract bioactive phenolics from SCGs.•SCGs could be reused as a resource for natural bioactive phenolics.•Phenolic compounds could be recovered easily from extracts by adsorption chromatography. S...

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Bibliographic Details
Published in:Food chemistry 2018-07, Vol.255, p.357-364
Main Authors: Yoo, Da Eun, Jeong, Kyung Min, Han, Se Young, Kim, Eun Mi, Jin, Yan, Lee, Jeongmi
Format: Article
Language:English
Subjects:
Anti-oxidant activity
Coffee - chemistry
Deep eutectic solvents
Flavonoids - analysis
Flavonoids - isolation & purification
Green Chemistry Technology - methods
Phenolic compounds
Phenols - analysis
Phenols - isolation & purification
Plant Extracts - chemistry
Plant Extracts - isolation & purification
Response surface methodology
Solvents - chemistry
Spent coffee grounds
Two-level fractional factorial design
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Summary:•A simple and green method to valorize SCGs was proposed.•DESs were used as an optimal safe solvent to extract bioactive phenolics from SCGs.•SCGs could be reused as a resource for natural bioactive phenolics.•Phenolic compounds could be recovered easily from extracts by adsorption chromatography. Spent coffee grounds (SCGs) are viewed as a valuable resource for useful bioactive compounds, such as chlorogenic acids and flavonoids, and we suggest an eco-friendly and efficient valorization method. A series of choline chloride-based deep eutectic solvents (DESs) were tested as green extraction solvents for use with ultrasound-assisted extraction. Extraction efficiency was evaluated based on total phenolic content (TPC), total flavonoid content, total chlorogenic acids, and/or anti-oxidant activity. A binary DES named HC-6, which was composed of 1,6-hexanediol:choline chloride (molar ratio 7:1) was designed to produce the highest efficiency. Experimental conditions were screened and optimized for maximized efficiency using a two-level fractional factorial design and a central composite design, respectively. As a result, the proposed method presented significantly enhanced TPC and anti-oxidant activity. In addition, phenolic compounds could be easily recovered from extracts at high recovery yields (>90%) by adsorption chromatography.
ISSN:0308-8146
1873-7072
DOI:10.1016/j.foodchem.2018.02.096