Charles University, Faculty of Pharmacy in Hradec Králové Department of Analytical Chemistry Candidate: Lukáš Kuda Supervisor: PharmDr. Veronika Pilařová, Ph.D. Title of Diploma Thesis: Development of Supercritical Fluid Extraction for Isolation of Biologically Active Substances The main aim of this study was to optimize the method for extraction of quercetin - flavonoid with antioxidant activity - from dried crushed quince fruit (Cydonia oblonga Mill.) using supercritical fluid extraction (SFE). The supercritical fluid extraction is a method in which supercritical fluid is used to extract active compounds. Neat CO2 is the most common used solvent. Due to its physicochemical properties, it is suitable solvent for the extraction of non-polar...