linoleic-acid and sabinene

The effects of salt on the essential oil yield and fatty acid composition of aerial parts of two marjoram varieties were investigated. Plants with 6 leaves were treated with NaCl (75mM).. Salt treatment led to a reduction in aerial part growth. Salinity increased the fatty acid content more significantly in Tunisian variety (TV) than in Canadian variety (CV). CV showed an increase in double-bond index (DBI) and a decrease in malondialdehyde content under salt stress, while the opposite was observed in TV. The DBI was mainly affected by a strong reduction in oleic and linoleic acids in TV, whereas a strong stimulation of linoleic acid in CV was observed. Salt decreased and increased the essential oil yield in TV and CV respectively. The main constituents of the essential oil of TV were trans-hydrate sabinene and terpinen-4-ol, which showed a significant decrease under salt stress. In contrast, the main constituents of the essential oil of CV were sabinene and trans-hydrate sabinene, which showed a significant decrease and increase respectively under salt stress.. Marjoram oil is a rich source of many compounds such as essential oils and fatty acids, but the distribution of these compounds differed significantly between the two varieties studied.

Topics: Bicyclic Monoterpenes; Fatty Acids; Flame Ionization; Gas Chromatography-Mass Spectrometry; Linoleic Acid; Lipid Peroxidation; Malondialdehyde; Monoterpenes; Oils, Volatile; Oleic Acid; Origanum; Plant Components, Aerial; Plant Shoots; Salinity; Salt Tolerance; Soil; Species Specificity; Stereoisomerism; Stress, Physiological; Terpenes; Tunisia

This study is designed to examine the chemical composition and antioxidant activity of the essential oil and different solvent extracts of Vitexagnuscastus. GC and GC-MS analysis was resulted in the detection of 27 components, representing 94.5% of the oil. Major components of the oil were 1,8-cineole (24.98%), sabinene (13.45%), alpha-pinene (10.60%), alpha-terpinyl acetate (6.66%), and (Z)-beta-farnesene (5.40%). Antioxidant activities of the samples were determined by three different test systems, DPPH, beta-carotene/linoleic acid and reducing power assays. In all systems, water extract exhibited excellent activity potential than those of other extracts (hexane, dichloromethane, ethyl acetate and methanol) and the oil. As expected, amount of total phenolics was very high in this extract (112.46+/-1.22mugGAEs/mgextract). Dichloromethane extract has been found to be rich in flavonoids. A positive correlation was observed between the antioxidant activity potential and total phenolic and flavonoid levels of the extracts.

Topics: Antioxidants; beta Carotene; Bicyclic Monoterpenes; Cyclohexane Monoterpenes; Cyclohexanols; Eucalyptol; Gas Chromatography-Mass Spectrometry; Linoleic Acid; Monoterpenes; Oils, Volatile; Oxidation-Reduction; Plant Extracts; Plant Oils; Sesquiterpenes; Vitex