Abstract
ABSTRACTSupercritical fluid extraction, with ethanol‐modified carbon dioxide, of free quercetin from onion skins (red and yellow varieties) was studied. Static mode was investigated as an extraction method, which generated a total of 0.024 g of free quercetin per kg of onion skin for the red variety, and 0.020 g per kg for the yellow variety, at 5700 psi, 40C, an average of 7.6% (molar concentration) of ethanol, and in an extraction period of 2.5 h.The modifier was found to have an important influence on free quercetin recovery. the greater the amount of ethanol collected in the trap, the greater the amount of free quercetin recovered.Identification and quantification analysis were conducted in a High Performance Liquid Chromatography system.
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