Comparing their spectroscopic data

The leaves of Combretum quadrangulare Kurz. collected in Long An Province were chemically investigated using multiple chromatographic methods. Four compounds, 5-hydroxy3,7,4′-trimethoxyflavone (1), ayanin (2), kamatakenin (3), and luteolin (4) were isolated and elucidated. Their chemical structures were elucidated by comparing their spectroscopic data with those in previous reports.

6p viellenkullman 16-05-2022 17 1   Download

Seven compounds including abietatriene (1), oleanolic acid (2), quercetagetin 3,7-dimethyl ether (3), luteolin (4), p-hydroxybenzoic acid (5), p-methylbenzoic acid (6), and protocatechuic acid (7) were isolated from the n-hexane: ethyl acetate (1:1) extract of Vitex negundo leaves collected in Binh Thuan Province. Their chemical structures were elucidated by comparing their spectroscopic data with reported data in the literature. Six compounds (exception of 4) were known to be present in Vitex negundo.

8p vithales 19-04-2022 16 1   Download

Phytochemical data of Sterculia foetida Linn. are scarce. The leaves of Sterculia foetida Linn. collected in Binh Thuan Province were chemically investigated using multiple chromatographic methods. Three compounds, hesperidin (1), kaempferol (2) and ursolic acid (3) were isolated and elucidated. Their chemical structures were elucidated by comparing their spectroscopic data with those in previous studies. These compounds were found for the first time from the leaves of Sterculia foetida Linn. Compounds 1 was obtained for the first time in Sterculia genus.

6p angicungduoc11 18-04-2021 18 1   Download

Five prenylated caged xanthones: desoxymorellin (1), morellic acid (2), gambogic acid (3), isogambogic acid (4) and 10α-butoxy gambogic acid (5), were isolated from the stem bark of Garcinia hanburyi collected in Vietnam. Their structures were elucidated by detailed 1D, 2D NMR, MS spectroscopic analyses and compared with reported data. Two major constituents, gambogic acid and isogambogic acid, displayed strong cytotoxicity against LLC and SK-LU-1cell lines with IC50 values in the range from 0.35±0.05 µM to 2.26±0.19 µM.

10p nguyenminhlong19 22-04-2020 29 1   Download

In this study, phytochemical investigation of the n-hexane and ethyl acetate extract of leaves and twigs of Urena lobata L. led to the isolation of β-sitosterol (1), β-sitosterol3-O-β-D-glucopyranoside (2), 2-acetylamino-3-phenylpropyl 2-benzoylamino-3-phenylpropanoate (3), quercetin (4), and trans-tiliroside (5). Their chemical structures were determined by spectroscopic methods, including MS, 1D-, 2D- NMR, and by comparing their spectral data with those reported in previous papers. Compounds 3 and 5 were isolated for the first time from Urena lobata L.

8p abcxyz123_02 03-03-2020 14 2   Download

Phytochemical research on the chloroform and ethyl acetate extracts of the rhizomes of Curculigoannamitica Gagnep. collected in Binh Chau - Phuoc Buu Nature Reserve, Ba Ria - Vung Tau province, led to the isolation of five phenolic compounds namely 3,4- dimethoxysalicylicacid(1), 2-hydroxy-6-methoxybenzoicacid(2), 4-hydroxybenzoic acid (3), pcoumaric acid (4) and 2-(ethoxymethyl) benzene-1,4-diol (5). Their chemical structures were confirmed by spectroscopic methods including HR-ESI-MS, ESI-MS,1D and 2D-NMR and compared with reported data.

7p abcxyz123_02 03-03-2020 17 1   Download

Seven tetraoxygenated xanthones, namely fuscaxanthone A, 7-O-methylgarcinone E, cowagarcinone A, cowaxanthone, rubraxanthone, cowanin and cowanol, were isolated from the dichloromethane extract of the latex of Garcinia cowa Roxb. ex Choisy. Their structures were elucidated on the basis of 1D, 2D NMR spectroscopic data and compared with reported data. This is the first time the chemical constituents of Garcinia cowa Roxb. ex Choisy have been investigated in Vietnam.

7p abcxyz123_02 03-03-2020 15 0   Download

Euphorbia tirucalli has not been chemically studied much in Vietnam. This research described the isolation and elucidation of compounds isolated from the plant collected in Binh Thuan. Multiple chromatographic methods were applied, including normal phase silica gel column chromatography and thin-layer chromatography. Seven compounds were isolated and their chemical structures were elucidated by spectroscopic analysis as well as comparing their data with the ones in the literature

7p elandorr 03-12-2019 7 0   Download

Multi chromatographic methods comprising normal phase silica gel column chromatography and thin layer chromatography were applied to the crude acetone extract to isolate and purify compounds 1-8. Their chemical structures were elucidated by spectroscopic analysis as well as comparing their data with ones in the literature

8p everydaywish 24-12-2018 22 1   Download

Chemical constituent study led to the isolation of three compounds, including methyl β-orcinolcarboxylate (1), salazinic acid (2) and atranorin (3). Their structures were confirmed unambiguously by , spectroscopic data and compared with those in references. This is the first report of salazinic acid distribution in such lichen.

4p giesumanh 04-11-2018 28 0   Download

Three flavonoids, spinosin (1), 6′′′-feruloyl spinosin (2) and 6′′′-sinapoyl spinosin (3) were isolated from EtOH extract of seed of Ziziphus mauritiana. Their structures were elucidated by the analysis of their spectroscopic data (ESI-MS,1 H-NMR,13C-NMR, DEPT, HSQC và HMBC) and compared with literatures. These compounds were isolated for the first time in Vietnam from the seed of Ziziphus mauritiana.

8p cumeo3000 01-08-2018 26 0   Download