Study of the antibacterial activity of essential oils of three moroccan and aromatics plants on four bacterial strains

The aim of this work is the in vitro evaluation of the antibacterial activities of essential oils extracted from three aromatic and Moroccan plants: Thymus vulgaris, Mentha spicata and Citrus limonum, on four bacterial strains: Staphylococcus aureus, Escherichia coli, Pseudomonas aerations and Klebsiella pneumoniae. These strains have been chosen for their pathological impact due to their pathogen city in relation to problems of resistance to common antibiotics. The results obtained showed that for the strains of Escherichia coli and Pseudomonas aerations, the essential oil of Thymus vulgaris, showed the highest antibacterial activity, while for the strains of Staphylococcus aureus and Klebsiella pneumonia, the essential oil of Menthe spicata which proved to be the most active. Published by the International journal of Microbiology and Mycology (IJMM

Etude De L’Activité Antioxydante Des Huiles Essentielles De Plantes Aromatiques Et Médicinales Marocaines

Morocco is a traditional supplier of medicinal and aromatic plants to the world. This activity has resulted to the exploitation of wild plants than dried plants for herbal needs and food flavors. Many species are used for the production of plant extracts and other aromatic essences mainly for the pharmaceutical and cosmetics industry. Among these metabolites, there are essential oils that are mixtures of aromatic substances present in the form of tiny droplets in the leaves, fruit peel, resin, branches, and wood. These oils, however, is endowed with antioxidant properties. This study aims to evaluate the antioxidant activity of essential oils of three moroccan aromatic and medicinal plants: Thymus vulgaris, Mentha spicata, and Citrus limonum. The oil extraction was performed by steam distillation in a Clevenger type apparatus. Also, the antioxidant activity of these oils was evaluated by the method of DPPH (2,2-diphenyl-1-picrylhydrazyl), in comparison with the antioxidant synthetic, ascorbic acid. In the present work, the results showed that the antioxidant activity of three essential oils studied by the trapping method of free radical is moderate. Also, the oil of Thymus vulgaris has a strong activity which exceeds that of ascorbic acid. This was followed by the oil of Mentha spicata, while the lowest activity was observed in Citrus limonum

Effect of purified wastewater from the city of Settat (Morocco) on the quality of Lippia citriodora essential oil and infusion

Lippia citriodora is an aromatic plant largely consumed in Morocco and throughout the world. It is well-known for its use in the field of food, medicine and aroma therapy. The production of this plant is for its local uses and for export. The therapeutic activity of L. citriodora or itsextracts mainly depends on the quality of finished products. In this study, we aimed to evaluate the effect of irrigation with urban wastewater from Settat (Morocco) treated by lagoons on the composition of the essential oil, essential oil yield and physico-chemical composition infusion of L. citriodora. The soil used for the implantation is characterized. Physico-chemical analyses of well water and wastewater used for irrigation are analyzed. From the results obtained we found changes in the composition of the essential oil of a large number of constituents. After irrigation of L. citriodora by wastewater we observe changes in major compounds in the essential oil: decreased neral (from 15.29% to 14.34%) and geranial (from 15.63% to 14.75%) and increased limonene (from 23.39% to 25.86%). We deduce that wastewater has a beneficial effect in increasing the yield of essential oil. The infusion of L. citriodora prepared by the fresh and dried leaves irrigated with wastewater contains a high concentration of NH4+, Ca2+, Mg2+, and the concentration of NO2–N (mg/L) exceeds 100% of the concentration of waste water

Antimicrobial potential of Streptomyces coeruleofuscus SCJ isolated from microbiologically unexplored garden soil in Northwest Morocco

Abstract Research on microorganisms in various biotopes is required to identify new, natural potent molecules. These molecules are essential to control the development of multi-drug resistance (MDR). In the present study, a Streptomyces sp., namely SCJ, was isolated from a soil sample collected from a Moroccan garden. SCJ isolate was identified on the basis of a polyphasic approach, which included cultural, micro-morphological, biochemical, and physiological characteristics. The sequence of the 16S rRNA gene of the SCJ strain showed 99.78% similarity to strains of Streptomyces coeruleofuscus YR-T (KY753282.1). The preliminary screening indicated that the SCJ isolate exhibited activity against Candida albicans ATCC 60,193, Escherichia coli ATCC 25,922, Staphylococcus aureus CECT 976, Staphylococcus aureus ATCC 25,923, Bacillus cereus ATCC 14,579, Pseudomonas aeruginosa ATCC 27,853, as well as various other clinical MDR bacteria and five phytopathogenic fungi. The ethyl acetate extract of the isolated strain demonstrated highly significant (p < 0.05) antimicrobial activity against multi-resistant bacteria and phytopathogenic fungi. The absorption spectral analysis of the ethyl acetate extract of the SCJ isolate obtained showed no absorption peaks characteristic of polyene molecules. Moreover, no hemolytic activity against erythrocytes was observed in this extract. GC–MS analysis of the ethyl acetate extract of the SCJ isolate revealed the presence of 9 volatile compounds including 3,5-Dimethylpyrazole, and pyrrolizidine derivatives (Pyrrolo[1,2-a]pyrazine 1,4-dione, hexahydro-3-(2-methylpropyl)), which could potentially explain the antimicrobial activity demonstrated in this study

<i>Thymus satureoides</i> Oil as Green Corrosion Inhibitor for 316L Stainless Steel in 3% NaCl: Experimental and Theoretical Studies

The protection of 316L stainless steel in 3% NaCl by the essential oil of Thymus satureoides has been studied by many techniques such as potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), atomic force microscopy (AFM) and scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy analysis (EDXS). The results show that the corrosion rate of 316L stainless steel decreases with the increase in the concentration of the inhibitor up to an efficiency of 82% for a concentration of 1600 ppm. The Thymus satureoides oil acts as an anode inhibitor. The values of the inhibition effectiveness obtained from the polarization curves and electrochemical impedance spectroscopy (EIS) are in good agreement. Geometry optimization and calculation of the structural and electronic properties of the inhibitor molecular system have been carried out using density functional theory DFT (B3LYP, BMK and M062X) level with a 6-311++G** basis set

Thymus satureoides Oil as Green Corrosion Inhibitor for 316L Stainless Steel in 3% NaCl: Experimental and Theoretical Studies

The protection of 316L stainless steel in 3% NaCl by the essential oil of Thymus satureoides has been studied by many techniques such as potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), atomic force microscopy (AFM) and scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy analysis (EDXS). The results show that the corrosion rate of 316L stainless steel decreases with the increase in the concentration of the inhibitor up to an efficiency of 82% for a concentration of 1600 ppm. The Thymus satureoides oil acts as an anode inhibitor. The values of the inhibition effectiveness obtained from the polarization curves and electrochemical impedance spectroscopy (EIS) are in good agreement. Geometry optimization and calculation of the structural and electronic properties of the inhibitor molecular system have been carried out using density functional theory DFT (B3LYP, BMK and M062X) level with a 6-311++G** basis set

Influence of Environmental Factors on Essential Oil Variability in Origanum compactum Benth . Growing Wild in Morocco

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