Integrated extraction-adsorption process for selective recovery of antioxidant phenolics from food industry by-product

[Display omitted] •Valorisation of food by-product by selective recovery of antioxidant polyphenols.•Simultaneous extraction and enrichment of antioxidant polyphenols.•Multi-criteria mathematical model proposed to optimize polyphenols recovery.•Model considering polyphenols yield, antioxidant activi...

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Veröffentlicht in:Chemical engineering and processing 2018-05, Vol.127, p.83-92
Hauptverfasser: Pradal, D., Vauchel, P., Decossin, S., Dhulster, P., Dimitrov, K.
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Sprache:eng
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Zusammenfassung:[Display omitted] •Valorisation of food by-product by selective recovery of antioxidant polyphenols.•Simultaneous extraction and enrichment of antioxidant polyphenols.•Multi-criteria mathematical model proposed to optimize polyphenols recovery.•Model considering polyphenols yield, antioxidant activity and energy consumption.•Integration improved recovery yields, reduced unit operation and energy consumption. This work aimed at proposing a green process for selective recovery of antioxidant polyphenols, in order to propose a sustainable valorisation of chicory grounds, a food-industry by-product. An integrated extraction-adsorption process was performed, enabling simultaneous extraction of phenolics and their purification in a single operation. After selecting the most efficient adsorbent among tested and experimental conditions for adsorption and desorption of antioxidant polyphenols, the integrated process was studied, using a central composite design, considering total polyphenols yield, antioxidant activity and energy consumption of the equipment. Influence of processing time (2, 4 or 6 h), processing flow rate (1, 3 or 5 L.h−1) and resin/chicory grounds ratio (1/10, 2/10 or 3/10, d.w./d.w.) were investigated. A mathematical model for multi-criteria optimisation was proposed. The integrated process enabled to improve polyphenols recovery efficiency by 63% and to reduce energy consumption by 2.8 times, compared to conventional process, where extraction and adsorption were performed successively.
ISSN:0255-2701
1873-3204
DOI:10.1016/j.cep.2018.03.016