Title: A STUDY OF THE ANTIOXIDANT ACTIVITY OF PLANTS OF THE GENUS POTENTILLA L.
Abstract: In this work, a comparative assessment of the antiradical properties of some species of the genus Potentilla L. is carried out to identify the most promising in terms of further study. The aboveground part of P. chrysantha Trevir., P. canescens Bess., P. tergemina Sojak, P. erecta (L.) Raeusch., P. paradoxa Nutt. ex Tott. et Gray, P. approximata Bunge, as well as the aboveground and underground parts of P. anserina L. were used as a research object, collected in the vicinity of Tomsk. The antiradical activity of the extracts of the studied plants was evaluated spectrophotometrically, observing the kinetics of the recovery of the stable radical of the DPPH extract. The dependence of the antiradical activity on the concentration and stability of the studied extracts was examined using P. paradoxa as an example. The total amount of phenolic compounds and flavonoids in the studied extracts was estimated. The specific absorption coefficient of gallic acid was found to be 47.3. For the aboveground parts of seven Potentilla species, the antiradical activity of extracts on ethyl alcohol 40 and 70% is significant and is in a narrow range from 77.57 to 80.91% for extracts on ethyl alcohol 40%, in a slightly wider range from 70.99 to 86.58% for extracts on ethyl alcohol 70%. A wide range of antiradical activity from 14.80% (P. tergemina) to 70.40% (P. paradoxa) is observed for 95% ethyl alcohol extracts. The difference in the chemical composition of ethanol extracts of individual representatives of the genus Potentilla significantly affects the antiradical activity with an increase in the concentration of ethyl alcohol.