Chemical composition, antibacterial and antioxydant activitiées of a new essential oil chemotype of algerian Artemesia arborescens L.

International audienceThe aim of the present study is to investigate the chemical composition, antibacterial and antioxidant activities of three essential oils extracted by hydrodistillation from the aerial parts of Artemisia arborescens L., which was collected from three different regions near Tlemcen city in the West Northern of Algeria: Beni Snous, Bidar and Chetouane. The chemical composition was investigated using both capillary gas chromatography (GC) and gas chromatography-mass spectrometry (GC/MS) techniques. Fifty-two compounds were detected, a total of fifty compounds, representing 81.8 to 90.2% of the total oils were identified in the three samples of essential oils. The essential oils of A. arborescens were rich in camphor (Beni Snous: 72.2%, Bidar: 50.3% and Chetouane: 32.8%). The present composition of the essential oils, with camphor as the only most abundant component, was considered as a new chemotype of A. arborescens growing in West Northern of Algeria. Antibacterial activity of the essential oils against gram-positive and gram-negative bacteria, was tested using the diffusion method and by determining the inhibition zone. The results showed that the oils had a great potential antibacterial activity against some bacteria. The maximum zone of inhibition was obtained against Enterococcus faecalis (22 mm). In contrast, the oils were ineffective on the inactivation of Lysteria monocytogenes and Escherichia coli. Antioxidant capacity was assessed by in vitro tests using 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay and significant activity was found for these A. arborescens oils. Key words: Artemisia arborescens L., Asteraceae, essential oil, chemical composition, chemotype, camphor, antibacterial activity, antioxidant activity

Chemical composition, antibacterial activity of a new essential oil chemotype of Algerian Artemisia arborescens L.

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Chemical Composition, antibacterial and free radical scavenging activities of Pinushalepensis Miller growing in West Northern of Algeria.

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Chemical composition and antibacterial activity of Pinus halepensis Miller growing in West Northern of Algeria.

International audienceObjective: To find new bioactive natural products, the chemical composition and to sudy the antibacterial activity of essential oil components extracted from the aerial parts of the Algerian aromatic plant Pinus halepensis Miller (P. halepensis) (needles, twigs and buds).Methods: The essential oil used in this study was isolated by hydrodistillation using a Clevenger-type apparatus according to the European Pharmacopoeia. The chemical composition was investigated using GC-retention indices (RI) and GC-MS. Results: Forty-nine compounds, representing 97.9% of the total collective oil, were identified. Essential oil was dominated by hydrocarbon compounds (80.6%) especially monoterpenes (65.5%). The major compounds from ten oils stations were: myrcene (15.2%-32.0%), α-pinene (12.2%- 24.5%), E-β-caryophyllene (7.0%-17.1%), terpinolene (1.8%-13.3%), 2-phenyl ethyl isovalerate (4.8%-10.9%), terpinene-4-ol (1.0%-8.2%) and sabinene (1.5%-6.3%). The intra-species variations of the chemical compositions of P. halepensis aerial part essential oil samples from ten Algerian sample locations were investigated using statistical analysis. Essential oil samples were clustered in 2 groups by hierarchical cluster analysis, according to their chemical composition. The essential oil revealed an interesting antimicrobial effect against Lysteria monocytogenes, Enterococcus faecalis, Pseudomonas aeruginosa, Acinetobacter baumanii, Citrobacter freundii and Klebsiella pneumoniae. Conclusions: These results suggest that the essential oil from P. halepensis may be a new potential source as natural antimicrobial applied in pharmaceutical and food industrie

Blessings in disguise: a review of phytochemical composition and antimicrobial activity of plants belonging to the genus Eryngium

Medicinal and edible plants play a crucial role in the prevention and/or mitigation of different human diseases from ancient times to today. In folk medicine, there are different plants used for infectious disease treatment. During the past two decades, much attention has been paid to plants as novel alternative therapeutic agents for the treatment of infectious diseases due to their bioactive natural compounds such as phenol, flavonoids, tannins, etc. The genus Eryngium (Apiaceae) contains more than 250 flowering plant species, which are commonly used as edible and medicinal plants in different countries. In fact, some genus Eryngium species are used as spices and are cultivated throughout the world and others species are used for the treatment of hypertension, gastrointestinal problems, asthma, burns, fevers, diarrhea, malaria, etc. Phytochemical analysis has shown that genus Eryngium species are a rich source of flavonoids, tannins, saponins, and triterpenoids. Moreover, eryngial, one the most important and major compounds of genus Eryngium plant essential oil, possesses a significant antibacterial effect. Thus, the objective of this review is to critically review the scientific literature on the phytochemical composition and antibacterial effects of the genus Eryngium plants. In addition, we provide some information about traditional uses, cultivation, as well as phytochemistry