Abstract

This paper deals with antioxidant activity of phenol and flavonoid contents in twenty different extracts obtained from the whole plant and plant parts of Teucriumchamaedrys L. var. glanduliferum Haussk. Antioxidant activity was determined in vitro using 2,2-diphenyl-1-picrylhydrazyl (DPPH) reagent and expressed as IC₅₀values ranged from 1165.75 to 24.51 µg/ml. Total phenols were determined using Folin-Ciocalteu reagent and their amounts ranged from 15.98 to 208.17 mg/g. The amounts of flavonoids in plant extracts were in range from 16.42 to 110.13 mg/g. Concentrations of phenols in different plant parts compared with concentrations for the whole plant were of uneven value. The highest concentration of flavonoids was in all the leaf extracts, while slightly lower was found in the stem extracts and the lowest in the flowered ones. A significant linear correlation was noticed between the values of the concentration of phenols and antioxidant activity. Parallel to the analysis of T. chamaedrys, Ginkgo biloba and Green tea extracts were analyzed for comparison, and the results indicated that some extracts of T. chamaedrys were equal in activity with Ginkgo or Green tea and some appeared to have greater activity. Based on these results, T. chamaedrys is a potential source of phenols as natural antioxidant substance of high value.

Key words: Teucrium chamaedrys L., wall germander, antioxidant activity, phenols, flavonoids.