Paper Title
Study of The Antibacterial Activity of Aqueous Extracts of Urginea Maritima

Abstract
Urginea Maritima is a medicinal plant belonging to the family of Liliaceae, this species found in wetlands.In this work, the stems of the variety of Mostaghanem and Annaba were studied. The use of the technique of successive maceration with four solvents: hexane, chloroform, ethyl acetate and methanol, which gives us, four extracts. These extracts subsequently dosed for the quantification of flavonoids and tannins.The dosage carried out on the extracts has shown that all the extracts are rich in certain families of secondary metabolites responsible for the biological activities of our plant. The evaluation of the antibacterial activity on eight bacterial strains of Gram positive and Gram negative carried out by the method of diffusion of the discs in solid medium, showed that the acetic extract has a significant antibacterial activity on the Bacillus T strain.From the comparison between the two varieties of Mostaghanem and Annaba, we conclude that the aerial part of the variety of Mostaghanem has a higher antibacterial activity than that of Annaba on the Bacillus T strain, while the acetic extract of the two varieties shows no activity with the other strains tested. In addition, Urgineamaritima is a perennial plant of one meter or more, glabrous, with very large bulb, oval, reddish or whitish. The red bulb contains scilliroside; toxic component derived from the plant Urgineamaritima, of the Liliaceae family. Despite being a toxic plant, it is characterized by very important therapeutic properties (diuretics, cardiotonics, etc.). In the scope of our work, we are interested in the study of the antibacterial activity of four extracts for two different Algerian varieties (Annaba and Mostaganem) by looking at the stem of Urgineamaritima.The extraction of phenolic compounds by the successive exhaustion method, allowed us to obtain eight extracts, and the dosage of these compounds confirmed the presence of the different chemical classes with varying concentrations from one extract to another, such as: flavonoids, and tannins. Hexane appears to be the most efficient, most selective solvent for extracting polyphenols from Urgineamaritima. Keywords - Health, medicinal plant, Urgineamaritima, Scilliroside, Selective.