Phytochemistry and antibacterial activity of plants extracts compared with two commercial antibiotics against E coli responsible for avian colibacillosis in Benin

Despite its prominent place in development strategies, poultry breeding faces many constraints, including pathological ones. Among pathologies that affect poultry, colibacillosis is one of the most diseases that are communicable to humans and associated with heavy economic losses. To fight efficiently against avian colibacillosis, the work aimed to evaluate antimicrobial potential evaluation of non-volatile extracts of Euphorbia hirta and Psidium guajava, as well as the essential oils of Clausena anisata and Aeollanthus pubescens extracts and two commercial antibiotics namely tetracolivit and Oxytetracyclin against Escherichia coli. To achieve this goal, susceptibility tests were performed on a strain of E. coli using agar diffusion and microdilution methods. Results obtained showed that essential oils from Clausena anisata and non-volatile extracts tested were not active on E coli. However, the essential oils extracted from Aeollanthus pubescens were active on the E. coli with MIC of 0.44 ± 0.21 mg/ml and MBC of 0.87 ± 0.41mg / ml for the oil of the whole part, followed respectively by flower oil  (MBC = 0.99 mg/ml) and leaf stem oil (MBC= 1.62 mg / ml). Comparing the activity of the essential oils of Aeollanthus with antibiotics tested, we noticed that tetracolivit was more active with MBC =0.15±0.07mg/ml on E. coli than these extracts which were more active than Oxytetracyclin (MBC=2.34±1.11mg/ml). In sum, the study showed that for a better management of avian collibacillosis in Benin, the tetracolivit is suitable as antibiotic which can be substituted by Aeollanthus pubescens essential oils

Huiles essentielles extraites de plantes aromatiques acclimatées au Bénin (étude chimique, évaluation biologique et applications potentielles / Guy Alain Alitonou ; sous la direction de Dominique C.K. Sohounhloue, Chantal Menut)

MONTPELLIER-BU Sciences (341722106) / SudocSudocFranceBeninFRB

Aeollanthus pubescens Benth. from Benin: A Potential Source of Essential Oil with High Antiradical Efficiency

International audienceThe chemical composition of the essential oils obtained by hydrodistillation from leaves of three samples of Aeollanthus pubescens Benth. (Lamiaceae) growing wild in Benin were analyzed by GC and GC-MS. To date the biological functions of A. pubescens essential oils have not been demonstrated scientifically even if this plant is traditionally used by local population in alimentary and medicine. We investigated the chemical composition of A. pubescens essential oils and their antiradical and anti-inflammatory activities. Twenty four compounds were identified and quantified in the essential oils, the major compounds being thymol (63.6 %; 9.5 %; 63.4 %), carvacrol (3.1 %; 51.1 %; 2.1 %), thymyl acetate (9.8 %; 0.8 %; 10.2 %), carvacryl acetate (0.8 %; 6.1 %; 0.7 %), p-cymene (5.6 %; 9.0 %; 5.5 %) and γ-terpinene (6.4 %; 11.2 %; 6.6 %). The antiradical activity of these oils was found to be high and a low anti-inflammatory activity was observed. Fractionation of a thymol rich sample allowed the identification of the bioactive fractions and their contribution to the efficiency of the whole extract. This study suggests that A. pubescens essential oils may be useful in the food industry where the antioxidants are used to retard the degradation of fatty substances, but also in cosmetics or in the field of herbal medicine, where the radical species are associated with the concept of antiaging

Comparative chemical study and cytotoxic activity of Uvariodendron angustifolium essential oils from Benin.

International audienceThis study aimed to compare the chemical composition of volatile extracts obtained by hydrodistillation of leaves, stems, bark and roots of Uvariodendron angustifolium (Engl. & Diels) R. E. Fries. The essential oils, obtained with yields between 0.12 and 0.66%, were analyzed by GC/FID and GC/MS. A great variability in the chemical composition was observed depending on the plant part treated. The essential oils obtained from leaves and stems contained mainly neral (29.7-30.5%) and geranial (42.9-47.3%), while methyl eugenol was the major component of the volatile extracts from bark (68.3%) and roots (85.3%). Interesting cytotoxic properties of these essential oils on human breast cancer cells MCF-7 were demonstrated