title: Antioxidant and antibacterial activities of crude extracts and essential oils of Syzygium cumini leaves.
abstract: This research highlights the chemical composition, antioxidant and antibacterial activities of essential oils and various crude extracts (using methanol and methylene chloride) from Syzygium cumini leaves. Essential oils were analyzed by gas chromatography-mass spectrometry (GC-MS).The abundant constituents of the oils were: α-pinene (32.32%), β-pinene (12.44%), trans-caryophyllene (11.19%), 1, 3, 6-octatriene (8.41%), delta-3-carene (5.55%), α-caryophyllene (4.36%), and α-limonene (3.42%).The antioxidant activities of all extracts were examined using two complementary methods, namely diphenylpicrylhydrazyl (DPPH) and ferric reducing power (FRAP). In both methods, the methanol extract exhibited a higher activity than methylene chloride and essential oil extracts. A higher content of both total phenolics and flavonoids were found in the methanolic extract compared with other extracts. Furthermore, the methanol extract had higher antibacterial activity compared to methylene chloride and the essential oil extracts. Due to their antioxidant and antibacterial properties, the leaf extracts from S. cumini may be used as natural preservative ingredients in food and/or pharmaceutical industries.
authors.affiliation: Plant Biochemistry Department, National Research Centre (NRC), Dokki, Cairo, Egypt. amin_amal@yahoo.com
authors.forename: Amal A
authors.initials: AA
authors.lastname: Mohamed
authors.forename: Sami I
authors.initials: SI
authors.lastname: Ali
authors.forename: Farouk K
authors.initials: FK
authors.lastname: El-Baz
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D000975:Antioxidants / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects; D045424:Complex Mixtures / Q000737:chemistry*; D005419:Flavonoids / Q000032:analysis; D016166:Free Radical Scavengers / Q000494:pharmacology; D008826:Microbial Sensitivity Tests; D009822:Oils, Volatile / Q000737:chemistry*; D010084:Oxidation-Reduction / Q000187:drug effects; D010636:Phenols / Q000032:analysis; D018515:Plant Leaves / Q000737:chemistry*; D027842:Syzygium / Q000737:chemistry*
chemical_list: D000900:Anti-Bacterial Agents; D000975:Antioxidants; D045424:Complex Mixtures; D005419:Flavonoids; D016166:Free Radical Scavengers; D009822:Oils, Volatile; D010636:Phenols