COMPARATIVE EVALUATION OF ANTIOXIDANT ACTIVITY OF EXTRACTS OF BERGENIA CRASSIFOLIA (L.) FITSCH LEAVES OF DIFFERENT TERMS OF VEGETATION
UDC 66.094.3.098
Abstract
New data on the chemical composition and antioxidant properties of aqueous leaf extracts of Bergenia crassifolia (L.) Fitsch of different periods of vegetation growing in the Republic of Buryatia were obtained. It is shown that this is one of the few plants whose leaves contain a significant amount of phenolic compounds. The maximum content of tannins was noted in the extract of red leaves of the incense – 2.42%. Depending on the phase of the collection of raw materials, the content of flavonoids in the water extracts of the leaves of the frangipani varied from 3.88 to 5.42%. A higher accumulation of flavonoids was observed in the extract of black leaves of badan, which is apparently associated with leaf fermentation, in which the cellular structure is destroyed, enzymes and polyphenols are released. The leader in determining the total content of anthocyanins, as well as for flavonoids, was the extract of black leaves of frankincense. The largest amount of arbutin was contained in the extract of green leaves of frankincense – 1.22%. The studied extracts had a high ability to absorb free radicals, however, the extract of green leaves of badan had the highest antiradical activity, had a minimum EC50 of 4 mg/cm3. The iron-chelating ability of the tested aqueous extracts of frankincense leaves of different periods of in vitro vegetation showed that the leaf extracts had weak iron-chelating activity.
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