QUANTITATIVE DETERMINATION OF THE SUM OF FLAVONOIDS OF THE ABOVEGROUND PART OF SCUTELLARIA COMOSA
UDC 615.322.581.8+44+45:582.949.2
Abstract
As a result of pharmacological studies, it was revealed that the sum of flavonoids from the aboveground part of the plant Scutellaria comosa (Lamiaceae family) has adaptogenic and antihypoxic effects. For the introduction into medical practice of a drug based on the sum of flavonoids, studies have been conducted on the standardization of raw materials – the aboveground part of the crested helmet. The analysis of plant raw materials by TLC and HPLC methods showed that the dominant flavonoid of the aboveground part of the crested skullcap is isoscutellarein 7-O-β-D-glucopyranoside.
A differential spectrophotometric technique has been developed for the quantitative determination of the sum of flavonoids of the aboveground part of the crested helmet in terms of isoscutellarein 7-O-β-D-glucopyranoside. The optimal parameters for the extraction of vegetable raw materials are: extraction with 70% ethyl alcohol in a boiling water bath for 60 minutes in the ratio "raw material – extractant" – 1 : 100, the degree of grinding of raw materials – 2 mm. It was found that with the differential version of spectrophotometric analysis, the flavonoids – AlCl3 system reaches equilibrium after 40 minutes. The maximum of the differential absorption spectrum of the alcohol extraction of Scutellaria comosa is observed at 346 nm and can be used to analyze this group of compounds.
The content of the sum of flavonoids in the aboveground part of the crested helmet varies from 9.72% to 10.27%. In order to establish the optimal harvesting time of plant raw materials, the content of the sum of flavonoids was determined by the vegetation periods of the plant in terms of isoscutellarein 7-O-β-D-glucopyranoside and it was determined that the maximum accumulation of the sum of flavonoids is observed during the flowering period (10.13% of the weight of air-dry raw materials).
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