Seasonal variation of phenolic compounds composition and antiradical activity in Sorbus aucuparia L. Bark
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2016-05-19 |
Sorbus L. genus is one of the most numerous genera of the Rosaceae family. Various rowan species are used for food and as a source of medicinal raw plant material. Our research aim – to investigate qualitative and quantitative composition of phenolic compounds in bark samples of rowan (Sorbus aucuparia L.) plants during the growth season and to evaluate antiradical activity of ethanol extracts of rowan bark samples. Total content of phenolic compounds varied from 6.40 to 10.51 % during the growth season. In bark samples quantitative estimation of neochlorogenic acid (0.004-0.193 %), chlorogenic acid (0.008-0.026 %) and isoquercitrin (0.001- 0.003 mg/g) was performed. Bark samples collected during budding stage were characterized by higher contents of neochlorogenic acid. Bark samples collected during budding stage and early flowering stages were characterized by higher contents of chlorogenic acid while bark samples collected during early flowering stage were characterized by higher contents of isoquercitrin. Studies of antiradical activity show that rowan bark samples are characterized by strong antiradical activity. The strongest antiradical activity was determined in rowan bark samples collected during budding stage, early flowering and fruit ripening stages. In conclusion, analysis of the composition of phenolic compounds in bark samples of rowan revealed a close relationship between the content of phenolic compounds in rowan raw plant material and different vegetation stages. Data on differences in phytochemical composition and antiradical activity of rowan bark samples in the course of various vegetation stages can be used for rational planning of the collection of raw plant material rich in phenolic compounds with specific biological effects.