Abstract
The antioxidant activity of aqueous and aqueous-EtOH extracts of Spirea media leaves and inflorescences collected from a natural population (Ust-Kulomsky District, Komi Republic) was determined. It was shown that the extracts were characterized by high contents of polyphenols (from 41.14 to 71.79 mg GAE/g dry weight), which are important natural antioxidants. It was found that the aqueous extracts of inflorescences and leaves had less radical-binding activity (RBA) than the aqueous-EtOH extracts. At the same time, the RBA of the aqueous-EtOH extract of leaves was greater than that of inflorescences. Astrong correlation between the RBA and the content of polyphenols in the extracts was found (r = –0.80, p < 0.05). Chelating activity (CA) that was highest in aqueous extracts of spirea leaves was found for all extracts. The aqueous-EtOH extract of inflorescences had greater CA than the aqueous extract.
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