Supercritical carbon dioxide extraction of phenolic compounds from potato (Solanum tuberosum) peels

de Andrade Lima, M., Andreou, R., Charalampopoulos, D. ORCID: https://orcid.org/0000-0003-1269-8402 and Chatzifragkou, A. ORCID: https://orcid.org/0000-0002-9255-7871 (2021) Supercritical carbon dioxide extraction of phenolic compounds from potato (Solanum tuberosum) peels. Applied Sciences, 11 (8). 3410. ISSN 2076-3417 doi: 10.3390/app11083410

Abstract/Summary

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
URI	https://reading-clone.eprints-hosting.org/id/eprint/97400
Item Type	Article
Refereed	Yes
Divisions	Life Sciences > School of Chemistry, Food and Pharmacy > Department of Food and Nutritional Sciences > Food Research Group
Publisher	MDPI
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