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Article

Supercritical Carbon Dioxide Extraction of Phenolic Compounds from Potato (Solanum tuberosum) Peels

1
Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Aberystwyth SY23 3EE, UK
2
Department of Food and Nutritional Sciences, University of Reading, Reading RG6 6UR, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Luca Fiori
Appl. Sci. 2021, 11(8), 3410; https://doi.org/10.3390/app11083410
Received: 19 March 2021 / Revised: 6 April 2021 / Accepted: 8 April 2021 / Published: 10 April 2021
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 solvent-based 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. View Full-Text
Keywords: supercritical carbon dioxide; methanol; phenolics; extraction; chlorogenic acid; optimization; potato peels supercritical carbon dioxide; methanol; phenolics; extraction; chlorogenic acid; optimization; potato peels
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MDPI and ACS Style

de Andrade Lima, M.; Andreou, R.; Charalampopoulos, D.; Chatzifragkou, A. Supercritical Carbon Dioxide Extraction of Phenolic Compounds from Potato (Solanum tuberosum) Peels. Appl. Sci. 2021, 11, 3410. https://doi.org/10.3390/app11083410

AMA Style

de Andrade Lima M, Andreou R, Charalampopoulos D, Chatzifragkou A. Supercritical Carbon Dioxide Extraction of Phenolic Compounds from Potato (Solanum tuberosum) Peels. Applied Sciences. 2021; 11(8):3410. https://doi.org/10.3390/app11083410

Chicago/Turabian Style

de Andrade Lima, Micael, Rafaela Andreou, Dimitris Charalampopoulos, and Afroditi Chatzifragkou. 2021. "Supercritical Carbon Dioxide Extraction of Phenolic Compounds from Potato (Solanum tuberosum) Peels" Applied Sciences 11, no. 8: 3410. https://doi.org/10.3390/app11083410

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