Université de Neuchâtel

Antibacterial triterpenes from Syzygium guineense (Myrtaceae)

Djoukeng, J.D. ; Abou-Mansour, Eliane ; Tabacchi, Raphaël ; Tapondjou, A.L. ; Bouda, H. ; Lontsi, D.

In: Journal of Ethnopharmacology, 2005, vol. 101, no. 1-3, p. 283-286

Antibacterial bioassay-guided fractionation of Syzygium guineense leaf extracts afforded 10 triterpenes, namely betulinic acid 1, oleanolic acid 2, a mixture of 2-hydroxyoleanolic acid 3a, 2-hydroxyursolic acid 3b, arjunolic acid 4a, asiatic acid 4b, a mixture of terminolic acid 5a, 6-hydroxyasiatic acid 5b, and a mixture of arjunolic...

Université de Lausanne

Contribution à la connaissance du métabolisme secondaire des Thymelaeaceae et investigation phytochimique de l'une d'elles: "Gnidia involucrata" Steud. ex A. Rich

Ferrari, Julien ; Hostettmann, Kurt (Dir.)

Thèse de doctorat : Université de Lausanne, 2002.

With the aim of acquiring a better knowledge of the secondary metabolism of the family Thymelaeaceae and of the discovering of new natural therapeutics, 30 extracts from 8 African plant species were submitted to chemical and biological screening. The following biological targets were used to estimate the activity of the extracts under study: the phytopathogenic fungus Cladosporium cucumerinum,...

Haute Ecole d'Ingénierie

Screening of the antimicrobial properties of four Australian native eucalyptus species = Screening des propriétés antimicrobiennes de quatre espèces d'eucalyptus d'origine australienne

Gilles, Martin ; Wuest, Matthias (Dir.)

Mémoire de diplôme HES : Haute Ecole d'Ingénierie, 2007.

Objectives This study was undertaken to screen the in vitro antimicrobial properties of four Ausralian native Eucalyptus species, i.e., E. dives, E. gunnii, E. olida and E. staigeriana against five food-related micro-organisms, i.e., E. faecalis, S. aureus, E. coli, P. aeruginosa and C. albicans. The influences of two different extraction methods as well as the influence of a surfactant as...

Université de Neuchâtel

Etude phytochimique et activités biologiques de quatre espèces camerounaises de la famille des Myrtaceae : Eucalyptus saligna Sm., Callistemon viminalis W., Syzygium guineense W. et Syzygium aromaticum M. et P.

Djoukeng, Jules Désiré ; Tabacchi, Raffaele (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2005 ; 1822.

Plants of the Myrtaceae family are aromatic and rich in essential oils, which explain their use in medicine. Some plants of this family are used traditonnally as post-harvest grain protectants in developing countries. In the aim to understand the traditional uses of Eucalyptus saligna Sm., Callistemon viminalis G., Syzygium guineense W. and Syzygium aromaticum Merr and Perry (Myrtaceae), we...

Université de Lausanne

Investigation phytochimique des plantes aquatiques Potamogeton pectinatus L., P. lucens L., P. perfoliatus L. et P. crispus L. (Potamogetonaceae)

Waridel, Patrice ; Hostettmann, Kurt (Dir.)

Thèse de doctorat : Université de Lausanne : 2003.

The secondary metabolites of Swiss freshwater plants, the pondweeds Potamogeton pectinatus L., P. lucens L., P. perfoliatus L. and P. crispus L. (Potamogetonaceae), were investigated. Because of their peculiar habitat, in-between aquatic and terrestrial life, aquatic plants should produce secondary metabolites with original chemical or biological features. Their apolar extracts were analysed by...

Université de Lausanne

Phytochemical investigation of plants used in African traditional medicine: "Dioscorea sylvatica" (Dioscoreaceae), "Urginea altissima" (Liliaceae), "Jamesbrittenia fodina" and "Jamesbrittenia elegantissima" (Scrophulariaceae)

Cogne, Anne-Laure ; Hostettmann, Kurt (Dir.)

Thèse de doctorat : Université de Lausanne : 2002.

In certain African countries, medicinal plants represent the unique source of to 90% of the population. The knowledge of traditional healers represents a basis for the pharmacological and phytochemical investigation of these natural medicines. This work first focused on the validation of use of two plants frequently employed in traditional medicine, Dioscorea sylvatica (Dioscoreaceae) and Urginea...