ABSTRACT
OBJECTIVE: To study the phenolic constituents from Caesalpinia decapetala (Roth) Alston. METHODS: The ethanol crude extract of C. decapetala was fractionalized by using petroleum ether and chloroform. The chloroform part was isolated by a series of chromatography methods, and the structures of purified compounds were elucidated by their physicochemical properties and spectroscopic data. RESULTS: Eleven phenolic compounds were isolated and identified as methyl 2,3,5-trihydroxybenzoate (1), protocatechuic acid methyl ester (2), N-trans-feruloyl tyramine (3), trichostachine (4), cinnamylpiperidine (5), gallic acid (6), methyl 3,4,5-trihydroxybenzoate (7), ethyl 3,4,5-trihydroxybenzoate (8), resveratrol(9), 3,4,3',5'-tetrahydroxydistyrene (10), and protosappanin A (11). CONCLUSION: Compounds 1-5 are isolated from this plant for the first time.
ABSTRACT
Objective: To study the chemical constituents from the fruits of Tribulus terrester. Methods: The constituents were isolated and purified by silica gel column chromatography, Sephadex LH-20 column chromatography, preparative HPLC and TLC methods. The structures were identified by HR-ESI-MS and spectral analysis methods. Results: Fourteen compounds were isolated from the fruits of Tribulus terrester and the structures were identified as N-p-feruloyltyramine (1), N-trans-p-coumaroyl-3-O- methyldopamine (2), methyl ferulic acid (3), caffeic acid methyl ester (4), protocatechuic acid methyl ester (5), trifilines A (6), 5β-spirost-25(27)-en-3β-ol-12-one 3-O-{β-D-glucopyranosyl-(1→2)-O-[β-D-glucopyranosyl-(1→3)]-β-D-glucopyranoside} (7), tribulosaponin B (8), isoterrestrosin B (9), 25(R)-spirostane-3,5-diene-12-one (10), 25 (R)-spirostane-24β-ol-4-ene-3,12-dione (11), 26-O-β-D-glucopyranosyl-(25S)-5α-furostane-20 (22)-en-12-one-3β,26-diol-3-O-α-L-rhamnopyranosyl-(1→2)-[β-D-glucopyranosyl- (1→4)]-β-D-galactopyranoside (12), terrestrinone A1 (13), and terrestrinone A2 (14). Conclusion: Compounds 1-7 are obtained from the Zygophllyaceae for the first time.
ABSTRACT
Objective To study the chemical components from aerial part of Tibetan herbal medicines Biebersteinia heterostemon. Methods The chemical constituents were isolated and purified by silica gel, Sephadex LH-20 chromatography and preparative liquid chromatography. Their structures were identified by physicochemical properties and spectral analysis. Results Thirteen compounds were isolated from B. heterostemon and their structures were identified as umbelliferone (1), 5,7,3’-trihydroxy-8,4’,5’- trimethoxyflavone (2), luteolin (3), quercetin (4), protocatechuic acid methyl ester (5), apigenin (6), alternariol (7), luteolin-7-O-β-D- glucoside (8), quercetin-3-O-β-D-glucoside (9), (+)-dehydrovomifoliol (10), β-sitosterol (11), 4’-methoxytricetin (12), and 3’,4’,5,8- tetrahydroxyflavanone-7-O-β-glucopyranoside (13). Conclusion Compounds 3, 5-7, 10, 11-13 are isolated from B. heterostemon for the first time. Compounds 5, 7, 10, 12, 13 are isolated from the genus Biebersteinia for the first time.
ABSTRACT
Objective: To study the constituents in the roots of Picrorhiza scrophulariiflora. Methods: The constituents of P. scrophulariiflora were separated and purified with chromatographic methods. The structures were elucidated by spectroscopic methods and chemical analyses. Results: Ten compounds were isolated from the roots of P. scrophulariiflora and identified as β-sitosterol (1), palmitic acid (2), octacosyl trans-ferulate (3), 3β-hydroxystigmast-5-en-7-one (4), 6β-hydroxystigmast-4-en-3-one (5), caffeic acid methyl ester (6), protocatechuic acid methyl ester (7), vanillic acid (8), caffeic acid (9), and piceoside (10). Conclusion: Compounds 2-7 and 9 are obtained from the plants of Picrorhiza Royle for the first time.