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

Volatile Constituents of the Corsican liverwort Frullania tamarisci

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Chemical composition of the essential oils of teucrium chamaedrys L. from Corsica and Sardinia

The composition of the essential oils of Teucrium chamaedrys L. from Corsica and Sardinia islands were investigated using a combination of gas chromatography (GC) and gas chromatography/mass spectrometry (GC/MS) after fractionation over column chromatography. Eighty-seven compounds were identified, the main components were β-caryophyllene (29.0% and 27.4%, respectively) and germacrene D (19.4% and 13.5%, respectively), followed by α-humulene (6.8%) and δ-cadinene (5.4%) in the Corsican sample and by caryophyllene oxide (12.3%) and α-humulene (6.5%) in the Sardinian sample. The study confirms the quantitative variability of the chemical composition of T. chamaedrys oils

Antimicrobial activity and chemical composition of Origanum glandulosum Desf essential oil and extract obtained by microwave extraction. Comparison with hydrodistillation

International audienceOriganum glandulosum Desf. essential oils obtained by hydrodistillation (HD), solvent-free microwave extraction (SFME) and the extract obtained by microwave-assisted extraction (MAE) were investigated by capillary gas chromatography and gas chromatography/mass spectrometry. The main components of both oils obtained by HD and SFME were thymol (41.6–81.1%) followed by -terpinene (27.0–3.1%), p-cymene (17.1–4.0%) and carvacrol (2.2–4.4%), respectively. In the same way, thymol (65.4%), -terpinene (13.1%), p-cymene (7.2%) and carvacrol (3.5%) were the main components of the extract obtained by hexane microwave extraction. The SFME method was most selective for the extraction of thymol. The examination of the antimicrobial activity of both essential oils against 10 bacteria, two yeasts and four moulds revealed that O. glandulosum oil is more antifungal than antibacterial. To our knowledge, the antifungal activity of the O. glandulosum oil obtained by HD and both antimicrobial and antifungal activities of O. glandulosum SFME oil were not yet reported. Our study suggests that O. glandulosum essential oil has the potential to be used as a food preservative and to prevent the growth of nosocomial bacteria

Antimicrobial activity and chemical composition of Origanum glandulosum Desf essential oil and extract obtained by microwave extraction. Comparison with hydrodistillation

International audienceOriganum glandulosum Desf. essential oils obtained by hydrodistillation (HD), solvent-free microwave extraction (SFME) and the extract obtained by microwave-assisted extraction (MAE) were investigated by capillary gas chromatography and gas chromatography/mass spectrometry. The main components of both oils obtained by HD and SFME were thymol (41.6–81.1%) followed by -terpinene (27.0–3.1%), p-cymene (17.1–4.0%) and carvacrol (2.2–4.4%), respectively. In the same way, thymol (65.4%), -terpinene (13.1%), p-cymene (7.2%) and carvacrol (3.5%) were the main components of the extract obtained by hexane microwave extraction. The SFME method was most selective for the extraction of thymol. The examination of the antimicrobial activity of both essential oils against 10 bacteria, two yeasts and four moulds revealed that O. glandulosum oil is more antifungal than antibacterial. To our knowledge, the antifungal activity of the O. glandulosum oil obtained by HD and both antimicrobial and antifungal activities of O. glandulosum SFME oil were not yet reported. Our study suggests that O. glandulosum essential oil has the potential to be used as a food preservative and to prevent the growth of nosocomial bacteria

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

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Adsorption proprieties and inhibition of mild steel corrosion in HCl solution by the essential oil from fruit of Moroccan Ammodaucus leucotrichus

International audienceThe essential oil from the fruits of Ammodaucus leucotrichus (AL oil) was studied by Gas Chromatography (GC) and Gas Chromatography-Mass Spectrometry (GC/MS). 10 components were identified accounting 94.7% of the total oil, which peryllaldehyde (73.5%) and limonene (12.5%) were the major compounds. The inhibitive effect of this essential oil on the corrosion of mild steel in 1M HCl solution was investigated by weight loss measurement as well as potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. From loss measurements, is clear that inhibition efficiency values increased with increase in inhibitor concentration but decreased with increase in temperature. Polarization measurements showed that the studied inhibitor is mixed type with significant reduction of cathodic and anodic current densities. The results of EIS measurements indicated that the corrosion of steel is mainly controlled by the charge transfer process. Various activation and adsorption thermodynamic parameters are evaluated and discussed. Linearity of Langmuir isotherm adsorptions indicated the monolayer formation of inhibitor on mild steel surface

Experimental and theoretical study on corrosion inhibition of new synthesized menthone derivatives (Menthopyrazole compounds) for mild steel in 1 M HCl solution

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Application of essential oil of Anvillea radiata as a green corrosion inhibitor for steel in 1M HCL solution

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