METHOD OF QUANTITATIVE DETERMINATION OF THE AMOUNT OF FLAVONOIDS IN THE RAW MATERI-ALS OF THE BETONICA OFFICINALIS
UDC 615.322:543.422.3
Abstract
The dried herb of the Betonica officinalis L., (Lamiaceae). The raw materials of the B. officinalis grown in the Penza region were studied. The purpose of this work is to determine the amount of flavonoids in the herb of the B. officinalis by spectrophotometry.
The quantitative determination of the amount of flavonoids in the herb of the letter by differential spectrophotometry was carried out. The presence of flavonoids was confirmed by differential spectrophotometry in extracts from the herb B. officinalis, and the analytical maxima of the studied compounds – 395 nm – were determined. Quantitative determination of the amount of flavonoids in the herb of the letter by differential spectrophotometry was carried out in terms of luteolin-7-glucoside. In order to recalculate the content of substances of a phenolic nature in the extraction of letter letters from grass to luteolin-7-glucoside, we used the specific absorption index of luteolin-7-glucoside at λ=395 nm for differential spectrophotometry. The optimal conditions for the extraction of flavonoids from the raw materials of this plant are justified (extractant – ethyl alcohol 70%; the ratio of "raw material – extractant" is 1 : 200; extraction time is 90 minutes; the degree of grinding of raw materials is 1.0 mm). It was determined that the average error in determining the content of flavonoids in the herb of the B. officinalis with a confidence probability of 95% is ±3.66%. It was revealed that the content of flavonoids in the herb of the B. officinalis is 0.74%.
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