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