geranyl-acetate and caryophyllene

Compounds having insecticidal activity can be used to control Aedes aegypti mosquitoes, a major worldwide vector, and several plants have a source of such molecules. A principal component analysis (PCA) was carried out to determine the criterion to select larvicidal metabolites. The insecticidal activity of seven selected metabolites by PCA was validated by determining its lethal concentrations 50 (LC

Topics: Acetates; Acyclic Monoterpenes; Aedes; Animals; Insecticides; Mitochondria; Monocyclic Sesquiterpenes; Mosquito Control; Oxidation-Reduction; Polycyclic Sesquiterpenes; Secondary Metabolism

The aim of the present study was to determine the effect of jasmonic acid added to the culture medium on composition of Lavandula angustifolia essential oils. The chemical composition was determined by gas chromatography coupled to mass detector (GC/MS). The experiment was conducted with the use of MS medium supplemented with increasing concentration of JA (0.2, 0.5, 1, 1.5 mg∙dm

Topics: Acetates; Acyclic Monoterpenes; Bicyclic Monoterpenes; Bridged Bicyclo Compounds; Cell Culture Techniques; Culture Media; Cyclohexanols; Cyclopentanes; Eucalyptol; Gas Chromatography-Mass Spectrometry; Lavandula; Monoterpenes; Oils, Volatile; Oxylipins; Polycyclic Sesquiterpenes; Sesquiterpenes; Terpenes

The present study reports the chemical composition and antioxidant activities of the essential oil extracted from the leaves and tender branches of Hypericum gaitii Haines (Hypericaceae) - an endemic plant of Eastern India. On hydrodistillation, the fresh leaves and tender parts of H. gaitii yielded 0.43% (v/w) of pale yellowish essential oil. Gas chromatography mass spectrometry analysis revealed the presence of 40 compounds, which represent 96.9% of the total oil. Monoterpene hydrocarbons (79.3%) predominated followed by sesquiterpene hydrocarbons (12.6%). Of these, α-pinene (69.5%), β-caryophyllene (10.5%), sabinene (5.6%), myrcene (3.0%) and geranyl acetate (2.0%) were the main constituents. Antioxidant activities of oil were evaluated by three different systems namely 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2-azinobis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS) and reducing power assay. Essential oil exhibited moderate antioxidant activities compared to butylated hydroxytoluene (BHT) and ascorbic acid.

Topics: Acetates; Acyclic Monoterpenes; Antioxidants; Bicyclic Monoterpenes; Butylated Hydroxytoluene; Gas Chromatography-Mass Spectrometry; Hypericum; India; Monoterpenes; Oils, Volatile; Plant Extracts; Plant Leaves; Polycyclic Sesquiterpenes; Sesquiterpenes; Terpenes

The bruchid, Callosobruchus maculatus (F.) causes major losses during the storage of cowpea seeds [Vigna unguiculata (L.)Walp.] in Sri Lanka. Essential oil isolated from Plectranthus zeylanicus plant was tested for potential insecticidal activity against C. maculatus. The gas chromatography studies of the essential oil of P. zeylanicus showed that ρ-cymene (3.5%), β-caryophyllene (0.2%), geranyl acetate (9.3%) and geraniol (7.2%) were the major constituents. The adults of C. maculatus were susceptible to both fumigant and contact toxicity of P. zeylanicus plant oil. LC(50) values of 0.927 and 0.010 g L(-1) were obtained for fumigant toxicity and contact toxicity assays, respectively. Oviposition and F(1) adult emergence were significantly inhibited by P. zeylanicus plant oil at a concentration higher than 0.001 g L(-1) in both fumigant and contact toxicities. The analysis of olfactometer and choice camber bioassays revealed the repellent effects of the oil of P. zeylanicus plant.

Topics: Acetates; Acyclic Monoterpenes; Animals; Chromatography, Gas; Coleoptera; Cymenes; Dose-Response Relationship, Drug; Drug Evaluation, Preclinical; Edible Grain; Female; Insect Repellents; Insecticides; Monoterpenes; Mortality; Oils, Volatile; Oviposition; Plectranthus; Polycyclic Sesquiterpenes; Sesquiterpenes; Sri Lanka; Terpenes