Antioxidant Properties of Extracts of Leaves and Inflorescences of Spiraea Media Franz Schmidt from the Flora of Komi Re
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Pharmaceutical Chemistry Journal, Vol. 54, No. 6, September, 2020 (Russian Original Vol. 54, No. 6, June, 2020)
MEDICINAL PLANTS ANTIOXIDANT PROPERTIES OF EXTRACTS OF LEAVES AND INFLORESCENCES OF SPIRAEA MEDIA FRANZ SCHMIDT FROM THE FLORA OF KOMI REPUBLIC T. I. Shirshova,1 K. V. Bezmaternykh,2 I. V. Beshlei,1 A. N. Smirnova,1 and O. N. Oktyabr’skii2 Translated from Khimiko-Farmatsevticheskii Zhurnal, Vol. 54, No. 6, pp. 45 – 48, June, 2020.
Original article submitted March 12, 2020. 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. A strong 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. Keywords: Spirea media, antioxidant activity, polyphenols.
Modern research on the contents of biologically active compounds (BACs) in plants includes studies of the antioxidant activity (AOA) and its dependence on the chemical composition. Several publications focused on studies of BACs and their antioxidant activity from plants of the genus Spiraea L. growing in the Russian Far East have appeared in the last decade [1, 2]. High contents of phenolic compounds such as flavonols, flavones, flavanes, phenolcarboxylic and hydroxycinnamic acids, and catechins are responsible for the pronounced AOA of extracts of leaves and inflorescences of these plants [3, 4]. The genus Spiraea is represented by 18 species under natural conditions in Russia [5, 6]. The pharmacological properties of S. media and S. salicifolia have been studied 1
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better than those of other species. AOA was previously reported for S. media seeds [7]. The high AOA of extracts of these plants were associated with high contents in them of catechins, which are considered unique natural antioxidants [1, 4, 8]. The highest catechin contents (5.7%) were observed in inflorescences of S. media var. media. Leaves of this plant contained significantly less (1.5%) of them [1]. Phenolic compounds are known to contribute greatly to the AOA [8, 9]. An analysis of the calculated Pearson correlation coefficients between the AOA and content of BACs in leaves and inflorescences of plants of the genus Spiraea showed that the AOA of aqueous extracts was statistically significantly positively related to the content of hydroxycinnamic acids (r = 0.52). The relationship was very low (r = 0.04) fo
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