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

被引:26
|
作者
de Andrade Lima, Micael [1 ,2 ]
Andreou, Rafaela [2 ]
Charalampopoulos, Dimitris [2 ]
Chatzifragkou, Afroditi [2 ]
机构
[1] Aberystwyth Univ, Inst Biol Environm & Rural Sci, Aberystwyth SY23 3EE, Dyfed, Wales
[2] Univ Reading, Dept Food & Nutr Sci, Reading RG6 6UR, Berks, England
来源
APPLIED SCIENCES-BASEL | 2021年 / 11卷 / 08期
关键词
supercritical carbon dioxide; methanol; phenolics; extraction; chlorogenic acid; optimization; potato peels; ULTRASOUND-ASSISTED EXTRACTION; FLUID EXTRACTION; CO2; EXTRACTION; ANTIOXIDANT ACTIVITY; BIOACTIVE COMPOUNDS; CHLOROGENIC ACID; OPTIMIZATION; POLYPHENOLS; GLYCOALKALOIDS; FRACTIONATION;
D O I
10.3390/app11083410
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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 (q(CO)(2), 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 degrees 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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页数:18
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