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Recycling 2016, 1(1), 194-204; doi:10.3390/recycling1010194

Extraction of Antioxidant Phenolics from Agri-Food Waste Biomass Using a Newly Designed Glycerol-Based Natural Low-Transition Temperature Mixture: A Comparison with Conventional Eco-Friendly Solvents

1
Department of Chemistry, University of Crete, Voutes 71003, Greece
2
Food Quality & Chemistry of Natural Products, Mediterranean Agronomic Institute of Chania (M.A.I.Ch.), International Centre for Advanced Mediterranean Agronomic Studies (CIHEAM), P.O. Box 85, Chania 73100, Greece
3
School of Environment, University of the Aegean, Mitr. Ioakim Street, Lemnos, Myrina 81400, Greece
*
Author to whom correspondence should be addressed.
Academic Editor: Michele Rosano
Received: 2 May 2016 / Accepted: 13 June 2016 / Published: 18 June 2016
(This article belongs to the Special Issue Organic Waste Management)
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Abstract

A novel natural low transition temperature mixture (LTTM), composed of glycerol and ammonium acetate (molar ratio 3:1), was tested for its efficacy as a solvent in recovering phenolics from chlorogenate-rich agri-food solid wastes, including potato peels (PPs), eggplant peels (EPPs), and spent filter coffee (SFC). The efficacy of this solvent was compared with other eco-friendly solvents, including aqueous glycerol, aqueous ethanol, and water. The LTTM was demonstrated to be by far the most efficient in extracting chlorogenates and superior or equally efficient with the other solvents in recovering flavonoids. LTTM extracts produced from waste were also more potent radical scavengers, but results on the reducing power were inconclusive. Liquid chromatography-diode array-mass spectrometry analysis showed that the polyphenolic profiles of all waste extracts obtained with the LTTM were rich in caffeoylquinic and p-coumaroylquinic acid conjugates. View Full-Text
Keywords: agri-food waste; antioxidants; eggplant peels; low-transition temperature mixtures; phenolics; potato peels; spent filter coffee agri-food waste; antioxidants; eggplant peels; low-transition temperature mixtures; phenolics; potato peels; spent filter coffee
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Manousaki, A.; Jancheva, M.; Grigorakis, S.; Makris, D.P. Extraction of Antioxidant Phenolics from Agri-Food Waste Biomass Using a Newly Designed Glycerol-Based Natural Low-Transition Temperature Mixture: A Comparison with Conventional Eco-Friendly Solvents. Recycling 2016, 1, 194-204.

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