Phytochemical screening, phenolic content and antioxidant activity of Lavandula species extracts from Algeria

Abstract

Background and Aims: We are interested in the comparison of phytochemical screening, the estimation of the phenolic content and the antioxidant activity of the leaves and flowers of three species of Lavandula (L. dentata, L. multifida, and L. stoechas) from the Tlemcen region (Algeria). Methods: The preparations of the hydro-methanolic extracts were carried out by maceration. The latter in order to quantify the phenolic compounds and to evaluate the antioxidant activity in vitro by trapping the DPPH° radical and iron reducer. Results: Phytochemical tests reveal the presence of tannins and flavonoids in all extracts with varying intensities. The determination of total phenols by the Folin ciocalteu method shows that the extract from the leaves of L. multifida is the richest in total phenols (23.11 mg EAG/g DW) and has the most important important reducing power (EC50= 343±10 μg/ml) and inhibition of DPPH radical activity (IC50= 7.43 μg/mL). Conclusion: In this context, the results presented deduce that these plants are a promising source of phenolic compounds. Biological studies are needed to elucidate and conclude the effectiveness of these plants, which can be a challenge for new food and cosmetic products.