ABSTRACT
Objective: To investigate the chemical constituents in the dried acrial part of Bupleunum malconense. Methods: Column chromatography, such as silica gel, MCI, and Sephadex LH-20 were used to isolate the compounds. Spectroscopic methods such as 1H-NMR and 13C-NMR were used to elucidate their structures. Results: Eleven compounds were separated and identified as quercetin (1), quercetin-3-O-α-L-arabinofuranoside (2), eriodictyol (3), 3',4',5,7-tetrahydroxy-3-methoxyflavone (4), protocatechuic acid (5), quercetin-3-O-α-L-rhamnopyranoside (6), kaempferol (7), isorhanmetin (8), rutin (9), β-sitosterol (10), and daucosterol (11). Conclusion: All 11 compounds are isolated from the plants in B. malconense for the first time. Compounds 3 and 4 are isolated from the plants in genus Bupleunum L. for the first time.
ABSTRACT
Objective: To study the chemical constituents from the roots and rhizomes of Rhodiola crenulata. Methods: The chemical constituents were isolated by repeated silica gel chromatography and medium pressure column chromatography. Their structures were identified by various spectroscopic data including ESI-MS, 1H-NMR, and 13C-NMR data. Results: Fourteen compounds were isolated from the ethyl acetate fractions of R. crenulata including 3,5-dihydroxy-3',4',7-trimethoxyflavone (1), 3,5,7,3'-tetrahydroxyflavone (2), 5,4'-dihydroxy-7,3'-dimethoxyflavone (3), kaemnpferol (4), kaemnpferol-3-O-β-D-glucopyranoside (5), kaemnpferol-3-O-α-L- rhamnopyranoside (6), tricin (7), tricin-7-O-β-D-glucopyranoside (8), quercetin (9), quercetin-3-O-β-D-glucopyranoside (10), quercetin-3-O-α-L-rhamnopyranoside (11), herbacetin-3-O-β-D-glucopyranoside (12), herbacetin-7-O-β-D-glucopyranoside (13), and herbacetin-7-O-α-L-rhamnoside (14). Conclusion: Compounds 1-3 are isolated from the plants in Rhodiola L. for the first time, compounds 5-6, 8, 10-13 are obtained from this plant for the first time.
ABSTRACT
Objective: To further study the chemical constituents of Clematoclethra scandens subsp. actinidioides. Methods: The compounds were isolated and purified by chromatographic methods such as silica gel column chromatography and preparative HPLC, and their structures were identified on the basis of physicochemical properties and spectral data. Results: Nineteen compounds were isolated and identified as vulgarsaponin A (1), 9-hydroxy-megastigma-4,7-dien-3-one-9-O-β-D-glucopyranoside (2), kaempferol-3-O- α-L-rhamnpyranoside (3), quercetin-3-O-α-L-rhamnopyranoside (4), quercetin-3-O-β-D-glucopyranoside (5), hyperoside (6), 1,3,6-tri-O-galloyl-β-D-glucopyranoside (7), 1,2,3,6-tetra-O-galloyl-β-D-glucopyranoside (8), catechin (9), gallocatechin (10), procyanidin B3 (11), protocatechuic acid (12), syringic acid (13), vanillic acid (14), 7-oxokaurenolide (15), stigmast-3,6-dione (16), stigmast-4-en-3,6-dione (17), taraxerol (18), and β-sitosterol (19). Conclusion: Compounds 1-12, and 16 are isolated from the plant of Clematoclethra Maxim. for the first time.
ABSTRACT
OBJECTIVE: To investigate the chemical constituents of the aerial parts of Ribes diacanthum Pall. METHODS: The compounds were isolated and purified by silica gel, Sephadex LH-20 colunm chromatography and HPLC. The structures were elucidated on the basis of spectral data and physiochemical properties. RESULTS: Nineteen compounds were isolated from 95% ethanol extracts and identified as quercetin (1), quercetin-3-O-β-D-glucopyranoside (2), quercetin-3-O-α-L-rhamnopyranoside (3), quercetin-3-O-β-D-neohesperoside (4), mearnsetin (5), myricetin-3-O-α-L-rhamnoside (6), myricetin-3-O-β-D-glucopyranoside (7), mearnsetin 3-O-β-D-glucopyranoside (8), mearnsetin 3-O-α-L-rhamnopyranoside (9), kaempferol-3-O-β-D-glucopyranoside (10), kaempferol 3-O-β-D-(2-O-α-L-rhamnopyranosyl) glucopyranoside (11), kaempferol 3-(2'', 6''-di-O-α-L-rhamnosyl)-β-D-glucoside (12), 1, 2, 4-trihydroxybenzene (13), vanillic acid (14), protocatechuic acid (15), 4-hydroxy benzoic acid (16), gallic acid (17), blumenol C glucoside (18), conocarpan (19). CONCLUSION: All the compounds are isolated from the title plant and the NMR data for 8 is reported here for the first time.
ABSTRACT
Objective: To study the chemical constituents from the aereal parts of Symplocos chinensis. Methods: The chemical constituents were isolated and purified by various column chromatographies. Their chemical structures were identified by physicochemical properties and spectral analyses. Results: Fourteen compounds were isolated from the the aereal parts of S. chinensis and identified as daucosterol (1), quercetin (2), quercetin-3-O-α-L-rhamnopyranoside (3), isoquercetrin (4), rutin (5), kaempferol-3- O-α-L-rhamnopyranosyl-(1→6)-β-D-glucopyranoside (6), niga-ichigoside F1 (7), shimobashiraside C (8), bergenin (9), protocatechuic acid (10), chrysophanol (11), aralia cerebroside (12), 2α, 3β, 19α, 23- tetrahydroxy-12-en-28-ursolic cid (13), and 2α, 3β, 19α, 23-tetrahydroxy-12-en-28-olenolic acid (14). Conclusion: Compounds 3, 5, 6, 8-12 are obtained from the plants of genus Symplocos Jacq. for the first time, and compounds 2-6 and 8-12 were obtained from the aereal parts of Symplocos chinensis for the first time.