Abstract: The antioxidant activity ofwater, ethanol and methanol Hieracium pilosella L.extracts is reported. The antioxidative activity was tested by spectrophotometrically measuring their ability to scavenge a stable DPPH· free radical and a reactive hydroxyl radical trapped by DMPO during the Fenton reaction, using the ESR spectroscopy. Total phenolic content and total flavonoid content were evaluated according to the Folin-Ciocalteu procedure, and a colorimetric method, respectively. A HPLC method was used for identification of some phenolic compounds (chlorogenic acid, apigenin-7-O-glucoside and umbelliferone). The antioxidant activity of the investigated extracts slightly differs depending on the solvent used. The concentration of 0.30 mg/mL of water, ethanol and methanol extract is less effective in scavenging hydroxyl radicals (56.35, 58.73 and 54.35%, respectively) in comparison with the DPPH· radical scavenging activity (around 95% for all extracts). The high contents of total phenolic compounds (239.59–244.16 mg GAE/g of dry extract) and total flavonoids (79.13–82.18 mg RE/g of dry extract) indicated that these compounds contribute to the antioxidative activity.
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Stanojević, L.; Stanković, M.; Nikolić, V.; Nikolić, L.; Ristić, D.; Čanadanovic-Brunet, J.; Tumbas, V. Antioxidant Activity and Total Phenolic and Flavonoid Contents of Hieracium pilosella L. Extracts. Sensors 2009, 9, 5702-5714.
Stanojević L, Stanković M, Nikolić V, Nikolić L, Ristić D, Čanadanovic-Brunet J, Tumbas V. Antioxidant Activity and Total Phenolic and Flavonoid Contents of Hieracium pilosella L. Extracts. Sensors. 2009; 9(7):5702-5714.
Stanojević, Ljiljana; Stanković, Mihajlo; Nikolić, Vesna; Nikolić, Ljubiša; Ristić, Dušica; Čanadanovic-Brunet, Jasna; Tumbas, Vesna. 2009. "Antioxidant Activity and Total Phenolic and Flavonoid Contents of Hieracium pilosella L. Extracts." Sensors 9, no. 7: 5702-5714.