De Andrade Lima, Micael ORCID: 0000-0003-3557-068X, Andreou, Rafaela, Charalampopoulos, Dimitris and Chatzifragkou, Afroditi (2021) Supercritical carbon dioxide extraction of phenolic compounds from potato (Solanum tuberosum) peels. Applied sciences, 11 (8):3410. ISSN 2076-3417 (Online) (doi:https://doi.org/10.3390/app11083410)

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Abstract

In the last three decades, greener technologies have been used, aiming at extracting phenolic compounds from vegetable matrices due to the inherent advantages compared to organic solventbased methodologies. In this work, supercritical CO2 was investigated for recovering phenolic acids from potato peels. Following screening runs for assessing the significant extraction parameters, a Central Composite Design of Experiments was carried out aiming at process optimization, with methanol concentration (MeOH, %) and CO2 flow rate (qCO2, g/min) as independent variables. Both parameters were deemed to impart a significant effect on the final response. Although the major phenolic acid in potato peels is chlorogenic acid (CGA), the main compound extracted was caffeic acid (CFA), present at a concentration of 0.75 mg/g dry peel in the extracts. The optimum extraction conditions were 80 ◦C, 350 bar, MeOH 20%, and flow rate of 18.0 g/min, which enabled a total phenolic recovery of 37% and a CFA recovery of 82%. The antioxidant activity of the supercritical fluid extraction (SFE) extracts was also measured, with the highest scavenging capacity reaching 73%. The need for using mixtures of water and organic solvents as co-solvents in SFE to enable CGA recovery seems necessary, possibly due to its better dissolution in aqueous solutions than in pure solvents.

Item Type:	Article
Additional Information:	This article belongs to the Special Issue Sustainable Bioprocessing Strategies for Agri-Industrial Side Streams Valorisation.
Uncontrolled Keywords:	supercritical carbon dioxide; methanol; phenolics; extraction; chlorogenic acid; optimization; potato peels
Subjects:	Q Science > QD Chemistry S Agriculture > S Agriculture (General) S Agriculture > SB Plant culture
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > Natural Resources Institute Faculty of Engineering & Science > Natural Resources Institute > Food & Markets Department
Last Modified:	29 Jun 2022 08:06
URI:	http://gala.gre.ac.uk/id/eprint/36285

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