Chrysophyllum perpulchrum (Sapotaceae) is used in the traditional Ivory Coast pharmacopeia to cure fevers. The extract of C. perpulchrum used for this study was the powdered form obtained from the maceration of the dried plant bark in 96% methanol, followed by evaporation to dryness. In the present study, the antioxidative and radical-scavenging activities of the methanolic extract were studied with three standard biological tests: DPPH reduction, ferric thiocyanate (FTC) lipidic peroxidation inhibition and thiobarbituric acid reacting substances (TBARS). Gallic acid and quercetin were used as references. The total amount of phenolic compounds in the extract was determined by ultraviolet (UV) spectrometry and calculated as gallic acid equivalents. Catechin and two dimeric procyanidins were found to be the compounds responsible for the activities. They were chemically dereplicated in the extract by LC-MS. For quantitation purposes, they were isolated by successive chromatographic methods and characterized by mass spectrometry (MS) and nuclear magnetic resonance (NMR) spectrometry. The quantities of these compounds in C. perpulchrum were 5.4% for catechin (P1), and 5.6 and 9.2% for dimers (compounds 2 (P2) and 3 (P3)), respectively. They displayed antioxidant activity with IC50 values of 2.50 ± 0.15 µg/mL (P1), 2.10 ± 0.2 µg/mL (P2) and 2.10 ± 0.1 µg/mL (P3). The total extract, the active fractions and the pure compounds inhibited the lipid peroxidation by the FTC method and the TBARS method in the range of 60%. These values were comparable to those seen for quercetin.
Turraea heterophylla Smith (Meliaceae) is a species used in Ivorian's traditional medicine for its various properties, such as antimalarial and aphrodisiac. This study aims to determine the chemical composition of the leaves from T. heterophylla and their content in polyphenols, in addition the antibacterial activity of the methanolic extract. Chemical test and spectrophotometry methods were used for phyotchemical study. The antibacterial activity was assessed using the agar well diffusion method against Staphylococcus aureus (ATCC 25923), Escherichia coli (CIP 54127AF) and Pseudomonas aeruginosa (CIP 103467). Phytochemical study revealed the presence of polyterpenes, steroids, alkaloids, saponins, polyphenols and flavonoids. A very high content of flavonoids and polyphenols were observed in the ethyl acetate and aqueous extracts. The antibacterial tests indicated that the methanol extract of the leaves from T. heterophylla had bacteriostatic properties against the germs tested with MIC values greater than 3000 µg / mL.
Two sterols namely β-sitosterol (1) and stigmasterol (2) were isolated from methanolic extract of the fruit barks of Coelocaryon klainei Pierre ex Heckel (Myristicaceae). They were isolated for the first time from this species. It is the first isolation of compounds in this genus Coelocaryon. The structures were elucidated on the basis of one and two-dimensional NMR, SM, IR and UV.Akoubet et al., International Current Pharmaceutical Journal, August 2017, 6(9): 49-52http://www.icpjonline.com/documents/Vol6Issue9/01.pdf
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