GC/MS Analysis and comparison of volatile compounds of Salvia aucheri Boiss. var. mesatlantica Maire., obtained by Hydrodistillation and Headspace Solid Phase Microextraction (HS-SPME)

International audienceThe essential oil and the volatile compounds of Salvia aucheri Boiss. var. mesatlantica Maire were analyzed by gas chromatography (GC) and GC-mass spectrometry (GC-MS). The volatile compounds were detected using headspace-solid phase microextraction (HS-SPME) under optimized parameters. A comparative qualitative and quantitative study on the composition of the oils was carried out. For this, 38 compounds, constituting 95.40% of the oil, were identified in the essential oil by hydrodistillation (HD), and 32 compounds, representing 93% of the oil, were characterized by HS-SPME. The major components identified are camphor (49.80%, 51.80%), 1,8-cineole (9.50%, 9.40%), viridiflorol (8.80%, 1.40%), camphene (7.80%, 10.60%), α-pinene (2.90%, 4.50%), and p-cymene (1.50%, 2.40%) of essential oil and volatile compounds detected in HS-SPME, respectively. Quantitative but not qualitative differences have been found in the chemical composition of both analyzed samples depending on the extraction method. For these reasons, HS-SPME can be considered as an alternative technique for isolating volatiles from aromatic plants

Melissopalynological and volatile analysis of honeys from Corsican Erica arborea maquis

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Chemical composition and effect of liquid and vapor phase of Lavandula multifida essential oil on mycelial growth of fungi responsible for the rot of apple

International audienceThis work aims to study the chemical composition and the antifungal activity of Lavandula multifida essential oil against three fungal decays of apples in post-harvest according to two methods: direct contact in agar médium and micro-atmosphère. This species has provided an essential oil with a yield of 2.4%. The chromatographic analysis (GC and GC/MS) of this essential oil has identified 28 constituents, accounting more than 90 % in total oil, which caravacrol (57.9 %) was the most principal component. The results obtained showed that the essential oil has a significant inhibition of the mycelial growth of all strains (p< 0.05).The minimum inhibitory concentration (MIC) of this oil is 0.125 μL/mL of air against the three strains tested when using microatmosphere method. In contrast, MICs are 0.125 μL/ mL for Alternaria sp., and 0.25μL/mL for Penicillium expansum and Rhizopus stlonifer when using the direct contact method. This antifungal activity is due mainly to the richness of this essential oil in carvacrol known for its effectiveness against the microbial agents

Chemical composition and antifungal activity of Mentha rotundifolia essential oil

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Chemical composition, adsorption proprieties and corrosion inhibition on mild steel of Mentha rotundifolia L. essential oil from Morocco

International audienceThe analysis of Mentha rotundifolia L. essential oil by Gas Chromatography (GC) and Gas Chromatography-Mass Spectrometry (GC/MS) allowed the identification of 25 components, which accounted for 94.3% of the total oil. Pulegone (69.1%) and menthone (18.5%) were identified as main compounds. The inhibitive effect of this essential oil on the corrosion of mild steel in 1M HCl solution has been investigated by weight loss measurement as well as potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The gravimetric results indicate that MR oil exhibits good inhibition efficiency in 1M HCl solution. The effect of temperature on the corrosion behavior of mild steel was studied in the range of 303–333K. Polarization measurements showed that the studied inhibitor is mixed type with significant reduction of cathodic and anodic current densities. Electrochemical impedance spectroscopy measurements revealed that the charge transfer resistance increases with increase in the concentration of essential oil. Various activation parameters such as activation energy, activation enthalpy and activation entropy are evaluated and discussed. Adsorption thermodynamic parameters are also computed. Linearity of Langmuir isotherm adsorptions indicated the monolayer formation of inhibitor on mild steel surface

Chemical composition, adsorption properties and corrosion inhibition on mild steel of mentha rotundifolia L. essential oil

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