-
Article
1 - Chemical constituents from the leaves and liana of <i>Salacia nitida</i> (Benth.) N.E.Br. (Celastraceae) and their antimicrobial activitiesBrice Mba’ning Joël E. T. Ateba Angelbert F. Awantu Luciana S. Amaral Gervais M. Happi Beate Neumann Georg Stammler Bruno Lenta Silvère A. Ngouela Iran Malavazi Etienne Tsamo Norbert Sewald Edson Rodrigues-FilhoTrends in Phytochemical Research , Issue 2 , Year , Spring 2019One benzophenone, 4′-hydroxy-2,4,6-trimethoxybenzophenone (1) was isolated from the liana and leaves of Salacia nitida (Benth.) N.E.Br., together with n-hexacosane (2), 29-hydroxyfriedelane (3), 3β-friedelinol (4), n-hexacosan-1-ol (5), n-octacosan-1-ol (6), MoreOne benzophenone, 4′-hydroxy-2,4,6-trimethoxybenzophenone (1) was isolated from the liana and leaves of Salacia nitida (Benth.) N.E.Br., together with n-hexacosane (2), 29-hydroxyfriedelane (3), 3β-friedelinol (4), n-hexacosan-1-ol (5), n-octacosan-1-ol (6), mangiferin (7), β-sitosterol-3-O-β-D-glucopyranoside (8), friedelin (9), 30-hydroxyfriedelin (10), salaspermic acid (11), 22β-epi-maytenfolic acid (12), orthosphenic acid (13), maltose (14), D-mannitol (15), cangoronine (16), 7-hydroxyfriedelane-1,3-dione (17), tingenone (18), pristimerin (19), α-amyrin acetate (20), β-sitosterol (21) and stigmasterol (22), 21-hydroxyfriedelan-3-one (23), abruslactone A (24), and 2α-hydroxypopulnonic acid (25). The structures of the isolated compounds were established by means of spectroscopic analysis. In addition, the structure of (1) was confirmed by its X-ray diffraction. Compounds (1), (7), (10)-(11), (13), (16)-(19) and (25) were evaluated for their antimicrobial activities. Compound (18) showed a significant activity against Staphylococcus aureus (MIC = 23.8 µM) while compounds (11) and (19) exhibited moderate inhibiting effect against Staphylococcus aureus (MIC = 53.8 µM) and Candida glabrata (MIC = 105.9 µM), respectively. Manuscript profile -
Article
2 - Characterization of bioactive compounds from <i>Ficus vallis-choudae</i> Delile (Moraceae)Jean Jules Kezetas Bankeu Amadou Dawé Marius Mbiantcha Guy Raymond Feuya Iftikhar Ali Marthe Aimée Tchuente Tchuenmogne Lateef Mehreen Bruno Lenta Muhammad Ali Augustin Silvère NgouelaTrends in Phytochemical Research , Issue 4 , Year , Autumn 2017Ficus vallis-choudae Delile has been reported to exhibit antifungal, anticonvulsant, anti-inflammatory and antinociceptive activities. Herein we report the first ever pharmacochemical studies on the figs of Ficus vallis-choudae resulting in isolation of a new ceramide n MoreFicus vallis-choudae Delile has been reported to exhibit antifungal, anticonvulsant, anti-inflammatory and antinociceptive activities. Herein we report the first ever pharmacochemical studies on the figs of Ficus vallis-choudae resulting in isolation of a new ceramide named nkwenamide (1). Also, seven known compounds including the binary mixture of β-amyrin palmitate (2) and lupeol palmitate (3), olean-12-en-3-one (4), n-hexacosan-1-ol (5), β-sitosterol (6), and mixture of β-amyrin (7) and lupeol (8) were isolated. Their structures were elucidated using spectroscopic methods. The methanol extract of the figs of this plant exhibited urease, and α-glucosidase activities and showed DPPH radical scavenging potency with IC50 values, 61.7, 73.7 and 87.4 µg/mL, respectively. It also showed a weak chemiluminescence activity as compared to ibuprofen. The mixture of 2 and 3 exhibited maximum urease inhibitory activity with IC50 value 23.9 µg/mL while the mixture of 7 and 8 showed the maximum α-glucosidase inhibition with IC50 value 44.0 µg/mL. All the isolates showed weak chemiluminescence activity. Manuscript profile -
Article
3 - Constituents of the ripe fruits of <i>Nauclea latifolia</i> Sm. (Rubiaceae) and their antileishmanial activitiesArgan Kelly Nkwenti Wonkam Cyrille Armel Ngansop Njanpa Joël E.T. Ateba Yannick S.F. Fongang Angelbert Awantu J.J.K. Bankeu Jean Rodolph Chouna Fabrice F. Boyom Norbert Sewald Bruno LentaTrends in Phytochemical Research , Issue 4 , Year , Autumn 2022The MeOH extract of the ripe fruits of Nauclea latifolia Sm. (Rubiaceae) showed potent antileishmanial activity in vitro during preliminary screening (IC50 = 2.20 µg/mL) against Leishmania donovani 1S (MHOM/SD/62/1S) promastigotes. Three of the four fractions of t MoreThe MeOH extract of the ripe fruits of Nauclea latifolia Sm. (Rubiaceae) showed potent antileishmanial activity in vitro during preliminary screening (IC50 = 2.20 µg/mL) against Leishmania donovani 1S (MHOM/SD/62/1S) promastigotes. Three of the four fractions of this extract showed moderate to good activities (7.06 ≤ IC50 ≤ 91.21 µg/mL) on the same strain. The purification of the fractions through CC yielded fifteen compounds whose structures were established based on their MS and NMR data. All the isolated compounds were assessed for their antileishmanial activity against L. donovani and for their cytotoxicity towards Raw 264.7 macrophage cells. 2,6-Dimethoxybenzoquinone (1) and hederagenin (6) showed good antileishmanial activity with IC50 values of 9.94 and 19.3 µM, respectively. Compound 1 was not selective, while compound 6 displayed a good selectivity towards raw 264.7 macrophage cells (SI > 7.82). These results indicate that the extract from N. latifolia fruits could be considered as a source of leishmaniacidal agents. Manuscript profile -
Article
4 - Chemical constituents and antimicrobial activities of some isolated compounds from the Cameroonian species of <i>Senna alata</i> (<i>Cassia alata</i> L. Roxb synonym, The plant list 2013). (Leguminosae)Simplice Chimi Fotso Alain Tcho Tadjong Willifred Dongmo Tekapi Tsopgni Bruno Lenta Celine Nkenfou Jean Duplex Wansi Flavien Aristide A. TozeTrends in Phytochemical Research , Issue 1 , Year , Winter 2021One fatty acid (1), one monoglycol ester (2), three diterpenes (3-5), four steroids (6-9), four triterpenes (10-13), three flavonoids (14-16), three anthraquinones (17-19) and one benzoquinone (20), were isolated from the methanolic extract of the leaves and trunk of Se MoreOne fatty acid (1), one monoglycol ester (2), three diterpenes (3-5), four steroids (6-9), four triterpenes (10-13), three flavonoids (14-16), three anthraquinones (17-19) and one benzoquinone (20), were isolated from the methanolic extract of the leaves and trunk of Senna alata. These compounds were obtained by extensive silica gel chromatography and their structures elucidated by 1D and 2D nuclear magnetic resonance (NMR) as well as comparison with literature data. Compounds (2-4) have been reported for the first time from this species. Some isolated compounds and methanolic crude extract of leaves and trunk were screened in vitro for their antimicrobial activities. Kaempferol (16) exhibited strong activity against all the tested strains, with MIC values varying from 15.5 to 31.2 µg/mL, emodin (18) was active with a strong activity (7.8 µg/mL) exhibited on Pseudomonas aeruginosa. The trunk crude extract showed a strong activity with MIC values varying from 15.6 to 62.5 µg/mL. Manuscript profile