Phenolic compounds and antioxidant activity of olive leaf extracts (Journal article)

Kontogianni, V. G./ Gerothanassis, I. P.

The total phenolic content and antioxidant activities of olive leaf extracts were determined. Plant material was extracted with methanol and fractionated with solvents of increasing polarity, giving certain extracts. The qualitative changes in the composition of the extracts were determined after the storage of leaves for 22 h at 37 degrees C, before the extraction. Total polyphenol contents in extracts were determined by the Folin-Ciocalteu procedure. They were also analysed by liquid chromatography-mass spectrometry. Their antioxidant activities were evaluated using the diphenyl picrylhydrazyl method and the beta-carotene linoleate model assay. Moreover, the effects of different crude olive leaf extracts on the oxidative stability of sunflower oil at 40 degrees C and sunflower oil-in-water emulsions (10% o/w) at 37 degrees C, at a final concentration of crude extract 200 mg kg(-1) oil, were tested and compared with butylated hydroxyl toluene.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας
Keywords: olive leaf extracts,phenols,lc-ms,antioxidant activity,leaves
ISSN: 1478-6419
Link: <Go to ISI>://000302310000014
Publisher: Taylor & Francis
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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