Total phenolic content, flavonoid concentrations and antioxidant activity, of the whole plant and plant parts extracts from Teucrium montanum L. var. montanum, f. supinum (L.) reichenb

Abstract

The aim of this study was to determine the total phenolic content, concentrations of flavonoids and in vitro antioxidant activity of twenty different extracts from the plant and plant parts (leaves, flowers and stems) of Teucrium montanum L. var. montanum, f. supinum (L.) Reichenb. The total phenolic content in the extracts was determined using Folin-Ciocalteu reagent and their amounts ranged between 8.33 to 169.06 mg GA/g. The concentrations of flavonoids in plant extracts varied from 3.96 to 88.31 mg RU/g. Antioxidant activity was analyzed in vitro using DPPH reagent, activity expressed as IC50 and obtained results ranged from 29.41 to 2408.47 μg/mL. Parallel to the analysis of T. montanum, Ginkgo biloba L. and Green tea (Camellia sinensis (L.) Kuntze) extracts were analyzed for comparison, and the results indicated that some extracts of T. montanum were equal in activity with Ginkgo or Green tea and some appeared to have greater activity. Based on these results of investigation, it could be concluded that T. montanum is a rich source of phenolic compounds as natural antioxidans of high value.