ABSTRACT
Objective To investigate the chemical constituents of Cinnamomi Ramulus. Methods Silica gel, Sephadex LH-20 column, and sp-HPLC chromatographies were applied to separate and purify the chemical constituents, followed by various spectral analyses to determine the chemical structures. Results Fifteen carboxylic acids and its derivatives were isolated, and their structures were identified as guizhi acid A (1), dihydrophaseic acid (2), rel-5-(3S,8S-dihydroxy-1R,5S-dimethyl-7-oxa-6-oxobicyclo [3,2,1]-oct- 8-yl)-3-methyl-2Z,4E-pentadienoic acid (3), vanillic acid (4), syringic acid (5), 4-hydroxybenzoic acid (6), E-cinnamic acid (7), E-o-hydroxycinnamic acid (8), erythro-guaiacylglycerol-8’-vanillic acid ether (9), salicylic acid (10), decumbic acid (11), hydroxyphenylpropionic acid (12), protocatechuic acid (13), E-melilotoside (14), and cryptamygin-B (15), respectively. Conclusion Fifteen compounds were successfully identified from Cinnamomi ramulus, among which 1 is a new compound and compounds 2, 3, 9-12 are isolated from the plant for the first time.
ABSTRACT
High-performance countercurrent chromatography (HPCCC) coupled with reversed-phase high-performance liquid chromatography (RP-HPLC) method was developed to isolate dihydrophaseic acid 3′-O-β-D-glucopyranoside (DHPAG) from the extract of Nelumbo nucifera seeds. Enriched DHPAG sample (2.3 g) was separated by HPCCC using ethyl acetate/n-butanol/water system (6:4:10, v/v/v, normal-phase mode, flow rate: 4.0 mL/min) to give 23.1 mg of DHPAG with purity of 88.7%. Further preparative RP-HPLC experiment gave pure DHPAG (16.3 mg, purity > 98%). The current study demonstrates that utilization of CCC method maximizes the isolation efficiency compared with that of solid-based conventional column chromatography.
Subject(s)
Chromatography , Chromatography, Liquid , Countercurrent Distribution , Methods , NelumboABSTRACT
Objective: To study the chemical constituents in green walnut husks of Juglans regia. Methods: The chemical constituents were separated and purified by silica gel column chromatography and HPLC. Their structures were determined on the basis of spectroscopic analyses. Results: Fifteen compounds were isolated and the structures were identified as epi-dihydrophaseic acid (1), 4-butoxy-5, 8-dihydroxy-3, 4-dihydronaphthalen-1-one (2), 4-ethoxy-5, 8-dihydroxy-3, 4-dihydronaphthalen-1-one (3), myricatomento-genin (4), nodulisporone (5), 5, 8-dihydroxy-4S-methoxy-β-tethalone (6), 5-hydroxy-4-methoxy-α-naphthalen-1-one (7), isosclerone (8), 4, 5, 8-trihydroxy-1, 2, 3, 4-tetrahydronaphthalene-1-one (9), 1-ethyl malate (10), 1-buthyl malate (11), succinic acid (12), ethyl-O-β-D-glucopyranoside (13), 1α, 2α, 4β-trihydroxy-1, 2, 3, 4-tetrahydronaphthalene (14), and L-2-O-methyl-chiroinosicol (15). Conclusion: Compounds 5 and 10-14 are isolated from the green walnut husks of J. regia for the first time, and compounds 1, 4, and 15 are isolated from this plant for the first time.
ABSTRACT
Objective: To investigate the chemical constituents in the shells of Juglans sigillata. Methods: The chemical constituents were isolated by silica gel, RP18, Sephadex LH-20, and MCI column chromatography and semi-preparative HPLC and so on. The structures were identified on the basis of spectroscopic analysis and chemical evidence. Results: Fifteen compounds were isolated and identified in the 70% ethanol extract from the shells of J. sigillata including seven phenolic glycosides: tachioside (1), mudanoside A (2), 4-O-β-D-glucopyranosylvanillc acid (3), breynioside A (4), 1-O-vanilloyl-β-D-glucose (5), 6'-O-vanilloyltachioside (6), and 6'-O-vanilloylisotachioside (7); three phenylpropanoide acid glycosides: 6-O-feruloyl-D-glucopyranose (8), methyl-4-O-coumaroylquinate (9), and 5-p-cis-coumaroylquinic acid (10); two tetralone glycosides: juglanin A (11) and juglanin E (12); one norsesquiterpenes glycoside: roseoside (13); one flavone: toxifolin (14); and one glucosylated abscisic acid derivate: (1'R, 3'R, 5'R, 8'S)-epi-dihydrophaseic acid β-D-glucoside (15). Conclusion: Except compound 14, the other compounds are isolated from the shells of J. sigillata for the first time. And compounds 1-4, 13, and 15 are reported for the first time from the plants in genus of Juglans L.