Abstract
The article discusses the possibilities of comparing the results of determining the total antioxidant activity (AOA) using three spectrophotometric methods: DPPH, ABTS, and FRAP. The obtained values were compared and revealed a high correlation for all pairs of comparisons as well as a close precision of the AOA content in plant extracts, regardless of the extractant or method of determination. The reliable AOA content in the regional flora was determined and varied in a very wide range from 1.44±0.12 to 1094.02±14.53 µmol TE/g DW plant material, with methanol extracts having the highest AOA concentration. Among 14 species of medicinal and protected plants of the Kaliningrad region, Alnus glutinosa L., Filipendula ulmaria L. и Calluna vulgaris L., а наименьшей Valeriana officinalis L. и Sedum acre L. had the highest AOA.
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