Abstract
In this study,essential oil and extracts of two Algerian plants, Atriplex halimus and Centaurium erythraea were examined for their antioxidant and antimicrobial activities. Essential oils are extracted by hydrodistillation and the extracts were prepared by maceration in differeent solvents. The deodorized water extract is the residual aqueous phase of the hydrodistillation. The extracts and essential oils are then subjected to qualitative and/or quantitative phytochemical analysis for the identification of their chemical compositions. Antioxidant potential was evaluated using following in vitro methods: FRAP assay, and scavenging of DPPH radical. Antimicrobial activity against five microbial species was determined by an agar diffusion method. Then, the MIC and MBC/MFC of active extracts are determined by the microdilution method. Phytochemical analysis of the extracts showed the presence of several classes of secondary metabolites. Through the two tests to evaluate the antiradical activity, we found that our extracts and essential oils exhibit antioxidant activity. The results of antimicrobial activity showed the effectiveness of essential oils and some extract against some microbial species tested. Due to their antioxidant and antibacterial properties, these plant extracts may be used as natural preservative ingredients in food and pharmaceutical industries.
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