Isolation and biological activity of compounds from Garcinia preussii |
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Authors: | Bernadette Biloa Messi Raimana Ho Alain Meli Lannang Delphine Cressend Karl Perron Augustin Ephrem Nkengfack |
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Affiliation: | 1. Department of Organic Chemistry, University of Yaoundé IYaoundéCameroon;2. School of Pharmaceutical Sciences, University of GenevaGenevaSwitzerland;3. School of Pharmaceutical Sciences, University of GenevaGenevaSwitzerland;4. Department of Chemistry, Higher Teachers' Training College, University of MarouaMarouaCameroon;5. Department of Botany and Plant Biology, Microbiology Unit, University of GenevaGenevaSwitzerland |
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Abstract: | Context: Plants of the genus Garcinia (Clusiaceae) are traditionally used to relieve stomachaches, toothaches, and as a chew stick.Objective: In order to determine which compounds were responsible for these activities, a phytochemical investigation of the fruits and leaves of Garcinia preussii Engl. was pursued.Materials and methods: Plants were extracted by solvents of various polarities. Compounds isolation was then carried out using chromatography methods (medium- and high-pressure liquid chromatography, open column and thin-layer chromatography). The isolated compounds were identified and characterized by using 1D and 2D NMR spectroscopies. The antioxidant activity was evaluated using DPPH?, ABTS??, ALP, and ORAC assays. The antimicrobial activity was assayed against Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, and Enterococcus faecalis by determining the minimum inhibitory concentration (MIC) value. The cytotoxic activity of most of the isolated compounds was evaluated on a small panel of human cancer cell lines (DU145, HeLa, HT-29, and A431) using the XTT method.Results: The phytochemical investigation of G. preussii led to the isolation of eight known compounds, six benzophenones and two flavonoids. These compounds were tested for their biological activities. 1, 2, 3, 4, 7 and 8 demonstrated a high free radical scavenging activity with ER50 ranging from 0.1 to 0.7. The antimicrobial activity was shown only against Gram-positive bacteria for 1, 4, and 5. A moderate cytotoxic activity with IC50 ranging from 7 to 50?µM was observed, except for 6 which was not active.Conclusion: These results appear to support some of the properties reported for Garcinia species. |
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Keywords: | Antimicrobial antioxidant benzophenones Clusiaceae cytotoxicity |
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