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Abstract
The effects of two extracting methods on the total phenolic and total flavonoid contents of Crataegus pentagyna subsp. elburensis Waldst. & Kit. ex Willd fruit extracts were investigated. Antioxidant activities of polyphenol (PP) fraction and ultrasonic (US) extraction were evaluated with four different in vitro antioxidant tests. IC50 for DPPH radical-scavenging activity was 32.2 ± 1.6 for PP fraction and 36.7 ± 1.5 µg mL−1 for US extract. Reducing powers of extracts increased with the increase of their concentrations. PP fraction exhibited high reducing power at 2–32 µg mL−1. Extracts exhibited good H2O2 radical scavenging and Fe2+ chelating ability. Their high phenolic and flavonoid contents could be responsible for their antioxidant activity and pharmacologic actions.