title: Antioxidant and antimicrobial activities of the edible medicinal halophyte Tamarix gallica L. and related polyphenolic constituents.
abstract: Tamarix gallica is a halophytic species having hepatotonic and stimulant properties, as it was traditionally used in the treatment of various liver disorders. Leaf and flower infusion have anti-inflammatory and anti-diarrheic properties. In this work, we have investigated antioxidant and antimicrobial activities of leaf and flower extracts and their phenolic composition. Results showed that flowers exhibit a higher antioxidant activity as compared to the leaves, IC(50) values of the flower extracts are being 1.3 (beta-carotene bleaching) to 19 times (lipid peroxidation inhibition) lower than those for leaves. Accordingly, flower extracts exhibited the highest total phenolic content (135.35 mgGAE/gDW) and RP-HPLC analysis showed that syringic acid, isoquercitin as well as catechin were the major phenolics. Furthermore, Tamarix extracts showed appreciable antibacterial properties against human pathogen strains. The mean inhibition zone was from 0 to 6.5mm when the concentration increased from 2 to 100mg/l. The strongest activity was recorded against Micrococcus luteus and the lowest activity was observed against Escherichia coli. Moreover, organ extracts show a weakly to moderate activity against the tested Candida. These findings suggest that Tamarix may be considered as an interesting source of antioxidants for therapeutic or nutraceutical industries and for food manufactures.
authors.affiliation: Laboratoire d'Adaptation des Plantes aux Stress Abiotiques, Centre de Biotechnologie à la Technopole de Borj-Cédria (CBBC), BP 901, 2050 Hammam-lif, Tunisia. physiologiste@yahoo.com
authors.forename: Riadh
authors.initials: R
authors.lastname: Ksouri
authors.forename: Hanen
authors.initials: H
authors.lastname: Falleh
authors.forename: Wided
authors.initials: W
authors.lastname: Megdiche
authors.forename: Najla
authors.initials: N
authors.lastname: Trabelsi
authors.forename: Baya
authors.initials: B
authors.lastname: Mhamdi
authors.forename: Kamel
authors.initials: K
authors.lastname: Chaieb
authors.forename: Amina
authors.initials: A
authors.lastname: Bakrouf
authors.forename: Christian
authors.initials: C
authors.lastname: Magné
authors.forename: Chedly
authors.initials: C
authors.lastname: Abdelly
mesh_terms: D000890:Anti-Infective Agents / Q000737:chemistry* / Q000494:pharmacology*; D000975:Antioxidants / Q000737:chemistry* / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects; D001713:Biphenyl Compounds / Q000737:chemistry; D002175:Candida / Q000187:drug effects; D002851:Chromatography, High Pressure Liquid; D003124:Colorimetry; D005419:Flavonoids / Q000737:chemistry* / Q000494:pharmacology*; D035264:Flowers / Q000737:chemistry; D016166:Free Radical Scavengers / Q000737:chemistry; D005609:Free Radicals / Q000737:chemistry; D007502:Iron Chelating Agents / Q000737:chemistry; D008826:Microbial Sensitivity Tests; D010084:Oxidation-Reduction; D010636:Phenols / Q000737:chemistry* / Q000494:pharmacology*; D010851:Picrates / Q000737:chemistry; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology; D018515:Plant Leaves / Q000737:chemistry; D059808:Polyphenols; D013481:Superoxides / Q000737:chemistry; D032363:Tamaricaceae / Q000737:chemistry*; D013634:Tannins / Q000737:chemistry; D019207:beta Carotene / Q000737:chemistry
chemical_list: D000890:Anti-Infective Agents; D000975:Antioxidants; D001713:Biphenyl Compounds; D005419:Flavonoids; D016166:Free Radical Scavengers; D005609:Free Radicals; D007502:Iron Chelating Agents; D010636:Phenols; D010851:Picrates; D010936:Plant Extracts; D059808:Polyphenols; D013634:Tannins; D019207:beta Carotene; D013481:Superoxides; C004931:1,1-diphenyl-2-picrylhydrazyl