title: Chemical composition, antimicrobial and insecticidal activities of the essential oils of Conyza linifolia and Chenopodium ambrosioides.
abstract: Two essential oil-containing plants growing wildly in Egypt: Conyza linifolia (Willd.) Täckh. (Asteraceae) and Chenopodium ambrosioides L. (Chenopodiaceae) were subjected to essential oil analysis and biological investigation. The essential oils from both plants were prepared by hydrodistillation, and GC/MS was employed for volatiles profiling. This study is the first to perform GC/MS analysis of C. linifolia essential oil growing in Egypt. C. linifolia essential oil contained mainly sesquiterpenes, while that of C. ambrosioides was rich in monoterpenes. Ascaridole, previously identified as the major component of the latter, was found at much lower levels. In addition, the oils were investigated for their antimicrobial activity against two Gram positive and two Gram negative bacteria, and one fungus. The insecticidal activities of both oils, including mosquitocidal and pesticidal potentials, were also evaluated. The results of biological activities encourage further investigation of the two oils as antimicrobial and insecticidal agents of natural origin.
authors.affiliation: a Department of Pharmacognosy , Faculty of Pharmacy, University of Alexandria , 21521 Alexandria , Egypt.
authors.forename: Fathalla M
authors.initials: FM
authors.lastname: Harraz
authors.forename: Hala M
authors.initials: HM
authors.lastname: Hammoda
authors.forename: Maged G
authors.initials: MG
authors.lastname: El Ghazouly
authors.forename: Mohamed A
authors.initials: MA
authors.lastname: Farag
authors.forename: Ahmed F
authors.initials: AF
authors.lastname: El-Aswad
authors.forename: Samar M
authors.initials: SM
authors.lastname: Bassam
mesh_terms: D000818:Animals; D000890:Anti-Infective Agents / Q000737:chemistry* / Q000302:isolation & purification; D027464:Chenopodium ambrosioides / Q000737:chemistry*; D035401:Conyza / Q000737:chemistry*; D003465:Culex / Q000187:drug effects; D000081005:Cyclohexane Monoterpenes; D004534:Egypt; D008401:Gas Chromatography-Mass Spectrometry; D007306:Insecticides / Q000737:chemistry* / Q000302:isolation & purification; D008826:Microbial Sensitivity Tests; D039821:Monoterpenes / Q000737:chemistry / Q000302:isolation & purification; D009822:Oils, Volatile / Q000737:chemistry*; D010545:Peroxides / Q000737:chemistry / Q000302:isolation & purification; D010938:Plant Oils / Q000737:chemistry*; D012717:Sesquiterpenes / Q000737:chemistry / Q000302:isolation & purification
chemical_list: D000890:Anti-Infective Agents; D000081005:Cyclohexane Monoterpenes; D007306:Insecticides; D039821:Monoterpenes; D009822:Oils, Volatile; D010545:Peroxides; D010938:Plant Oils; D012717:Sesquiterpenes; C043372:ascaridole
keywords: Chenopodium ambrosioides; Conyza linifolia; GC–MS; antimicrobial; essential oil; insecticidal