title: In vitro antibacterial, antifungal and antioxidant activities of Eucalyptus spp. leaf extracts related to phenolic composition.
abstract: The crude methanolic extracts from leaves of Eucalyptus camaldulensis L., E. camaldulensis var obtusa and E. gomphocephala grown in Egypt were investigated to explore their chemical composition as well as their antibacterial, antifungal and antioxidant activities. Major phenolics found were ellagic acid, quercetin 3-O-rhamnoside, quercetin 3-O-b-D-glucuronide, caffeic acid and chlorogenic acid. The antioxidant activities were examined by the 2,2'-diphenypicrylhydrazyl (DPPH) and β-Carotene-linoleic acid assays. E. camaldulensis extracts showed the highest phenolic content, antioxidant and antimicrobial activities compared to other cultivars. MIC values reported for antibacterial activity of E. camaldulensis ranged from 0.08 μg/mL (Bacillus cereus) to 0.22 μg/mL (Staphylococcus aureus), while MBC values ranged from 0.16 μg/mL (Dickeya solani and B. cereus) to 0.40 μg/mL (S. aureus). The inhibitory activities against growth of bacteria and fungi used is an indication that E. camaldulensis a might be useful resource for the development and formulation of antibacterial and antifungal drugs.
authors.affiliation: a Medicinal Plants Laboratory, Department of Floriculture, Ornamental Horticulture and Garden Design, Faculty of Agriculture (El-Shatby) , Alexandria University , Alexandria , Egypt.
authors.forename: Hosam O
authors.initials: HO
authors.lastname: Elansary
authors.affiliation: b Department of Forestry and Wood Technology, Faculty of Agriculture (El-Shatby) , Alexandria University , Alexandria , Egypt.
authors.forename: Mohamed Z M
authors.initials: MZM
authors.lastname: Salem
authors.affiliation: c Department of Plant Pathology, Faculty of Agriculture (El-Shatby) , Alexandria University , Alexandria , Egypt.
authors.forename: Nader A
authors.initials: NA
authors.lastname: Ashmawy
authors.affiliation: d Department of Geography, Environmental Management and Energy Studies , University of Johannesburg , Johannesburg , South Africa.
authors.forename: Kowiyou
authors.identifier: http://orcid.org/0000-0002-4789-1723
authors.initials: K
authors.lastname: Yessoufou
authors.affiliation: b Department of Forestry and Wood Technology, Faculty of Agriculture (El-Shatby) , Alexandria University , Alexandria , Egypt.
authors.forename: Ahmed A A
authors.initials: AAA
authors.lastname: El-Settawy
mesh_terms: D000900:Anti-Bacterial Agents / Q000302:isolation & purification* / Q000494:pharmacology; D000935:Antifungal Agents / Q000302:isolation & purification* / Q000494:pharmacology; D000975:Antioxidants / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects; D004534:Egypt; D005052:Eucalyptus / Q000737:chemistry*; D008826:Microbial Sensitivity Tests; D003904:Mitosporic Fungi / Q000187:drug effects; D010636:Phenols / Q000032:analysis; D010936:Plant Extracts / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry
chemical_list: D000900:Anti-Bacterial Agents; D000935:Antifungal Agents; D000975:Antioxidants; D010636:Phenols; D010936:Plant Extracts
keywords: Eucalyptus leaves; antibacterial; antifungal; antioxidant; phenolics