N., . Chelli ChentoufA, Tir Touil Meddah,, Benfreha Temmouri H. H., Meddah B.2023-03-212023-03-212018-05-01N.Chelli Chentou A.Tir Touil Meddah, H. Benfreha Temmouri, B. Meddah . PHYTOCHEMICAL SCREENING AND ANTIBACTERIAL EFFECT OFZIZYPHUS LOTUS. Journal of Fundamental and sciences. vol.10, no 2. May 2018. Faculty of exact sciences. university of el oued. [visited in24/01/2017]. available from [http://www.jfas.info]http://dspace.univ-eloued.dz/handle/123456789/17831articalThe aim of this in vitrostudy was to assess the antibacterial effect of the methanolic extrac obtained from the roots of Zizyphus lotus (communally collected in Mascara on bacteria responsible of oral pathologies, isolated from students aged from 20 to 28 years. Chemical qualitative analysis of this extract revealed the presence of polyphenols, flavonoids and tannins confirmed by a quantitative analysis which revealing433,65μg EGA / mg dm of polyphenols, 247,87μg EQ / mg dm of flavonoids and 167.05 μg ECT/ mg dm of tannins. The students) revealed four staphylococci, lactobacilli and enterobacteria). The methanolicenantibacterial effect; methanolic extract; flavonoids; oralZizyphus lotusArticle