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This work presents the results of the use of maceration and ultrasonic extraction for the isolation of antioxidant substances, particularly flavonoids, from the  Polygonum Weyrichii  Fr. Schmidt growing in the Murmansk region. This plant is characterized by a high content of flavonoids and other antioxidant substances, and therefore may be of interest as a potential source of natural antioxidants. The efficiency of extracting flavonoids from various parts of plants (inflorescences and leaves) by maceration for 24 hours in 70% ethanol and using ultrasonic extraction for 1-5 hours at a temperature of 50 °C is compared. Antioxidant activity was evaluated for all extracts using the phosphomolybdate method. It was found that the maximum extraction of flavonoids is achieved by using ultrasonic extraction for 2 to 4 hours.

Flavonoid content and antioxidant activity of extracts of Polygonum Weyrichii Fr. Schmidt