PHYTOCHEMICAL CONSTITUENTS, PHENOLIC CONTENTS, AND ANTIOXIDANT ACTIVITY OF CRATAEGUS AZAROLUS EXTRACTS
Â Objective: The aim of this study was the isolation and identification of secondary metabolites from Crataegus azarolus (L.) and the antioxidant evaluation of its extracts and compounds.
Methods: The air-dried powdered parts of the plant were extracted with 70% methanol and fractionated by chloroform, ethyl acetate, and n-butanol. The n-butanol extract was separated using polyamide SC6 column and silica gel TLC. In addition, a fraction of silica gel column of the CHCl3 extract was analyzed by gas chromatographyâ€“mass spectrometer (GCâ€“MS). The total phenolic and total flavonoid contents of CHCl3 and n-butanol extracts were estimated. Furthermore, the antioxidant activities of CHCl3, n-butanol extracts, and two flavonoids were evaluated according to five different methods.
Results: Eight compounds were identified in CHCl3 and n-butanol extracts, among them, five volatile compounds identified by GCâ€“MS for the 1st time from the species, as well as three known flavonol glycosides identified by spectral analysis (ultraviolet,1H-nuclear magnetic resonance [NMR], and13C-NMR) and by comparison with literature data. The n-butanol extract showed the higher content of polyphenols (307.33 Â± 2.33 mg (gallic acid equivalents)/g extract) and flavonoids (143.0 Â± 2.12 mg QE/g extract) and it proves the highest antioxidant activity with all assays used.
Conclusion: Five volatile compounds were identified for the 1st time from the C. azarolus and the antioxidant potential of plant extracts was measured using five different methods.
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