Etude chimique et biologique des huiles essentielles de Juniperus phoenicea ssp. lycia et Juniperus phoenicea ssp. turbinata du Maroc

Chemical and biological study of essential oils of Moroccan Juniperus phoenicea ssp. lycia and Juniperus phoenicea ssp. turbinata. The composition of the essential oils of the branches and berries of Juniperus phoenicea (Cupressaceae), J. phoenicea ssp. lycia (plain) and J. phoenicea ssp. turbinata (mountain), obtained by hydrodistillation, collected from Morocco, was analyzed by GC and GC/MS. The yields of essential oils were varying in function of the subspecies and of the part of the plant studied. The essential oils of these tree species are largely dominated by α-pinene and may be an important source of this component of a great interest on the international market. The effectiveness of essential oils from branches of the subspecies lycia against fungi decay wood has also been emphasized

Propriétés anti oxydantes et anti-inflammatoires des huiles essentielles des différentes parties de Tetraclinis articulata (Wahl) Masters du Maroc

International audienceL'utilisation routinière d'antioxydants et d'anti-inflammatoires de synthèse est remise en question du fait d'effets négatifs sur la santé du consommateur qui leur ont été récemment attribués. Ainsi, de nouvelles substances naturelles d'origine végétale dotées de propriétés antioxydantes et anti-inflammatoires sont recherchées. Cette étude a pour but d'évaluer et de comparer l'activité antioxydante et anti-inflammatoire des huiles essentielles des feuilles, des rameaux et de la sciure de bois de tronc de Tetraclinis articulata (Vahl) Masters, originaire du plateau central marocain (région de Khemisset). Le contenu en phénols totaux des huiles essentielles a été mesuré par la méthode de Folin-Ciocalteu et l'analyse de leurs composants majoritaires a été effectuée par chromatographie en phase gazeuse et spectrométrie de masse. Les propriétés antioxydantes ont été évaluées par trois tests : le test de piégeage du radical diphényl picryl hydrazyl (DPPH), le test de blanchiment du β-carotène et le pouvoir réducteur (FRAP). L'activité anti-inflammatoire est évaluée par la méthode enzymatique de la 5-lipoxygénase. Les huiles essentielles du tronc et des feuilles, plus riches en phénols totaux, ont manifesté un important potentiel antioxydant, avec les trois méthodes, supérieur à celui du composé antiradicalaire de référence (butylhydroxytoluène ou BHT) et des rameaux respectivement. Par ailleurs, les trois organes, particulièrement le tronc, ont montré une activité anti-inflammatoire considérable mais cette activité reste inférieure à celle de l'acide nordihydroguaiarétique (NDGA) utilisé comme contrôle positif

Activité antimicrobienne et composition chimique de l'huile essentielle de Plectranthus aromaticus Roxb. de l'Ile de la Grande Comore

Antimicrobial activity and chemical composition of Plectranthus aromaticus Roxb. essential oil from Grande Comore Island. This work aims to study the antibacterial and antifungal activity and chemical composition of Plectranthus aromaticus essential oil from Grande Comore Island. This species has provided an essential oil with a yield of 1.31%. The chromatographic analysis (GC and GC/MS) of the essence of P. aromaticus has identified about 32 constituents which are the most dominant: the trans-verbenol (23.11%), carvacrol (22.96%) and 1,4-cineol (14.50%). The antimicrobial activity of this oil has been studied with respect to seven microorganisms. The essential oil of P. aromaticus has proven antibacterial and antifungal activity at low concentrations

Composition chimique et activité antimicrobienne des huiles essentielles de Thymus algeriensis Boiss. & Reut. et Thymus ciliatus (Desf.) Benth. du Maroc

Chemical composition and antimicrobial activity of the Thymus algeriensis Boiss. & Reut. and Thymus ciliatus (Desf.) Benth. essential oils of Morocco. The aim of this work is to study the chemical composition and antibacterial and antifungal activity of essential oils of Thymus algeriensis Boiss. & Reut. and Thymus ciliatus (Desf.) Benth. of Morocco against seven microorganisms. The essential oils of T. ciliatus are characterized by the presence of thymol (44.2%), β-E-ocimene (25.8%) and α-terpinene (12.3%) as principal chemical components. The essential oils of T. algeriensis are formed mainly by camphor (27.7%) and α-pinene (20.5%). The oil of T. ciliatus showed a strong antibacterial and antifungal activity against all tested bacteria and fungi. This bioactivity is due mainly to the richness of this essential oil in thymol known for its effectiveness against the microbial agents

Juniperus Phoenicea essential oil as green corrosion inhibitor for mild steel in molar hydrochloric acid

Juniperus Phoenicea Essential Oil (JPEO) was obtained by hydro-distillation and characterized using Gas Chromatography Electronic (GC). It is found that major component was α-pinene (89.31%). In addition, this compound was investigated as green corrosion inhibitor of mild steel in 1.0 M HCl using potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). The polarization measurements showed that JPEO acts as mixed-type inhibitor and its inhibition efficiency increased with concentration to reach 88.3% at 250 ppm. This result was confirmed the EIS. The influences of temperature and immersion time were also studied in the range from 298 to 328 K and up to 12 h, respectively. The kinetic and thermodynamic data of activation dissolution process were determined and discussed