Comparative chemical analysis of volatile compounds of Warionia saharea leaves using hydrodistillation and headspace solid-phase microextraction (HS-SPME)

The objective of this study is to report the comparative chemical analysis of essential oil (EO) obtained by hydrodistillation (HD) and volatile fraction (VF) detected by headspace solid-phase micro-extraction (HS–SPME) isolated from Warionia saharea leaves using Gas Chromatography–Retention Indices (GC-RI) and GC–Mass Spectrometry (GC-MS). 39 volatile compounds identified in hydrodistilled essential oil (HD), representing 92.7% of the total oil, while HS-SPME revealed 25 components constituting 94.1% of the volatile material. The chemical composition of the HS-SPME and HD extract comprised mainly of phenylpropanoids (36.9%) and oxygenated sesquiterpenes (52.8%), respectively. The comparative analysis of two chemoprofiles obtained by two methods shows both qualitative as well as quantitative differences. The current study is the first report involving rapid analysis of volatile components of W. saharea by HS-SPME

Characterization of Lavandula multifida volatile composition from Morocco by headspace solid-phase Microextraction (HS-SPME) and Hydrodistillation coupled to GC–MS

The essential oil and volatiles compounds of Lavandula multifida L., aerial parts collected in South-East Morocco, obtained by hydrodistillation (HD) and headspace solid phase Microextraction (HS-SPME), were analyzed using Gas Chromatography-Flame Ionization Detector (GC-FID) and GC-Mass Spectrometry (GC-MS). 31 components, accounting 94.3% in the total essential oil, were identified by HD and 21 compounds, representing 90.2% of the headspace, were characterized by HS-SPME. The major components identified are carvacrol (57.9% ; 65.6%), carvacrol methyl ether (7.6% ; 4.6%), p-cymen-8-ol (3.9% ; 4.8%) and spathulenol (3.8% ; 8.6%) of essential oil and volatile compounds detected in HS-SPME, respectively. By comparison of HD and HS-SPME extraction, only quantitative differences of some components can be observed in both aromatic profiles, while qualitatively are rather similar. This study demonstrates that HD and HS-SPME modes could be complimentary extraction techniques in order to obtain the complete characterization of plant volatiles

Synthesis, Characterization and Corrosion Inhibition Potential of Olefin Derivatives for Carbon Steel in 1M HCl: Electrochemical and DFT Investigations

This research aims to evaluate the anticorrosive properties of three olefins derivatives synthesized by the microwave oven technique in a dry environment. These olefins have been identified using different analytical methods, including NMR, IR and XRD. The corrosion inhibition of these compounds for carbon steel in 1 M HCl solution was studied using potentiodynamic polarization (PDP) curves, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDX). The experimental results show that the tested compounds are good corrosion inhibitors for steel in an acidic media. Furthermore, the inhibition efficiency increased with increasing inhibitor concentration and decreased with increasing temperature. The PDP study showed the mixed type nature of these inhibitors, whereas thermodynamic parameters suggested that their adsorption obeys the Langmuir isotherm model. The EIS measurements revealed that the corrosion of the steel is produced by a single mechanism, which is charge transfer. SEM with EDX analysis confirmed the protection of the steel surface by the adsorption of the inhibitors. The relationship between the electronic properties of the inhibitors and the protective ability was further discussed using DFT calculations. Both experimental and theoretical results are well compatible and complement each other well

Assessment of the Corrosion Inhibition Ability of Eucalyptus globulus Leaf Extract Essential Oil on C24 Steel in a 1M HCl Environment

This study examined the properties of the essential oil of Eucalyptus globulus, an aromatic plant present in Senegal. The essential oil was extracted by hydrodistillation and analyzed by usual gas chromatography (GC/Ir and GC/MS). The main chemical compounds identified were eucalyptol (40.42%), α-phellandrene (8.92%), limonene (7.17%), and α-pinene (6.49%). The inhibitory effect of this essential oil on C24 steel in 1M HCl medium was also evaluated using electrochemical methods. The results indicated a maximum effectiveness of 80.6% at an essential oil concentration of 1.5 g/L and a temperature of 290 K. Beyond this concentration, the effectiveness decreased. We also examined the influence of temperature on the inhibitory action of the essential oil, in a range from 290 to 328 K. We found a decrease in effectiveness with increasing temperature, reaching 48.67% at 328 K. In addition, the thermodynamic quantities were calculated. The isotherm results demonstrated that the adsorption of the essential oil follows the Langmuir isotherm, suggesting a physical adsorption character of this essential oil on the C24 steel

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

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

Melissopalynological and volatile analysis of honeys from Corsican Erica arborea maquis

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Characterization of Corsican "spring clementine" and "spring predominant asphodel" honeys by melissopalynological and volatile analysis

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Liquid and vapour-phase antifungal activities of essential oil of Salvia aucheri Boiss. var. mesatlantica Maire. (Endemic from Morocco) against fungi commonly causing deterioration of apple

International audienceThe essential oils of Salvia aucheri var. mesatlantica, an endemic medicinal plant from Morocco, have been studied using gas chromatography (GC) and GC-mass spectrometry (GC-MS). 38 compounds were identified and the major components were camphor (49.0%), 1,8-cineole (9.5%), viridiflorol (8.8%), camphene (7.8%), α-pinene (2.9%) and p-cymene (1.5%). The antifungal activity of the essential oil was evaluated in vitro by poison food (PF) technique and the volatile activity assay (VA) against three phytopathogenic causing the deterioration for apple such as Alternaria sp., Penicillium expansum and Rhizopus stolonifer. The results indicated that the essential oil of S. aucheri mesatlantica inhibited significatively the mycelial growth of all fungal strains tested (p2 μL/mL in PF technique for all strains tested. Fungal sporulation was also completely inhibited at 2 μL/mL air for three pathogens. The overall results suggest that S. aucheri mesatlantica essential oil have a potential as antifungal preservatives for the control of postharvest diseases of appl