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Le H.T.,National Institute of Medicinal Materials | Ha D.T.,National Institute of Medicinal Materials | Minh C.T.A.,Yeungnam University | Kim T.H.,Yeungnam University | And 3 more authors.
Archives of Pharmacal Research | Year: 2012

Phytochemical investigation of the stem barks of Canarium bengalense (Burseraceace) resulted in the isolation of a new flavone glycoside (5) together with six known compounds (1-4, 6, and 7). The chemical structure of the new compound was elucidated as 3′-hydroxy-7,4′-dimethoxyflavone-5-O- α-L-arabinofuranosyl-(1→6)-β-D-glucopyranoside by means of 1D and 2D NMR ( 1H- 1H COSY, HMQC, and HMBC) and MS analyses. To evaluate the in vitro cytoprotective effect, the isolates (1-7) were tested against hydrogen peroxide (H 2O 2)-induced damage in primary cultured hepatocytes. The viability of hepatocytes was increased by treatment with each compound, except compound 1. Compounds 3, 4, and 7 exerted cytoprotective effects comparable to curcumin, the positive control. Our results suggest that the cytoprotective constituents of C. bengalense may contribute to its traditional use in the treatment of tumor and liver damage. © 2012 The Pharmaceutical Society of Korea and Springer Netherlands. Source

Ho D.V.,Hue University | Kodama T.,University of Toyama | Le H.T.B.,Hue University | Phan K.V.,Institute of Marine Biochemistry | And 8 more authors.
Bioorganic and Medicinal Chemistry Letters | Year: 2015

Abstract A new polyoxygenated cyclohexene, (-)-3-O-debenzoylzeylenone (1), and a new megastigmane glycoside, grandionoside A (2), were isolated from the aerial parts of Uvaria grandiflora collected in Vietnam, together with ten known compounds including polyoxygenated cyclohexenes (3-6), a triterpenoid (7), an alkaloid (8), a long chain alcohol (9), hexenyl glycopyranoside (10), and saponins (11-12). Their chemical structures were elucidated by a combination of extensive NMR spectroscopy with X-ray crystallographic analysis for 1, and chemical conversion for 2. Compound 1 exhibited significant cytotoxicity against the LU-1 and SK-Mel-2 cell lines with IC50 values of 4.68 and 3.63 μM, respectively. Remarkably, the cytotoxicity of 12 against the LU-1, KB, Hep-G2, MKN-7, and SW-480 cell lines was comparable to that of ellipticine, the positive control, with IC50 values ranging from 1.24 to 1.60 μM. © 2015 Elsevier Ltd. Source

Tai B.H.,Chungnam National University | Tai B.H.,Institute of Natural Products Chemistry | Nhiem N.X.,Chungnam National University | Nhiem N.X.,Institute of Marine Biochemistry | And 8 more authors.
Bioorganic and Medicinal Chemistry Letters | Year: 2011

A new iridoid, named methylscutelloside (1) together with 19 known compounds belonging to the iridoids (2-4), monoterpenoids (5), flavonoids (6-8), triterpenoids (9-14), and phenylethanoids (15-20) were isolated from the flowers of Buddleja officinalis. Their chemical structures were elucidated on the basis of physicochemical properties, and by spectroscopic methods including 1D, 2D NMR, and MS. All isolated compounds were tested in vitro for their effects on the proliferation of rat aortic vascular smooth muscle cells (VSMCs). Among them, iridoids were the main active components and showed significant inhibitory effects on PDGF-BB-induced proliferation in rat aortic VSMCs. © 2011 Elsevier Ltd. All rights reserved. © 2011 Elsevier Ltd. All rights reserved. Source

Van Nguyen H.,Institute of Marine Biochemistry | Van Pham C.,Institute of Marine Biochemistry | Do T.T.,Institute of Biotechnology | Mai H.D.T.,Institute of Marine Biochemistry | And 6 more authors.
Natural Product Communications | Year: 2014

New oseltamivir analogues were designed and synthesized, starting from shikimic acid. Biological evaluation against three human cancer cell lines (KB, MCF7 and Lu-1) showed that many of them exhibited cytotoxic activity. Azides 5 are more active than the corresponding amines 6. Thus, the reduction of the azide group into amine led to the loss of cytotoxicity. The compounds with a cyclohexanemethyloxy group at C-3 were more active than the other investigated compounds belonging to the same series. This cyclohexanemethyloxy group seems to be critical for the cytotoxic activity of this class of compounds. The synthetic oseltamivir analogues 6a-e had no inhibition activity, even at the concentration of 50 μM when they were evaluated for their in vitro influenza A neuraminidase inhibitory activity by an enzymatic assay. Source

Van N.T.H.,Vietnam Academy of Science and Technology | Vien T.A.,Industrial University of Ho Chi Minh City | Nhiem N.X.,Institute of Marine Biochemistry | Van Kiem P.,Institute of Marine Biochemistry | And 9 more authors.
Natural Product Communications | Year: 2014

Using a combination of chromatographic methods, one new flavonol glycoside, myricetin 3,7-di-O-α-L-rhamnopyranoside (1), and nine known compounds myricitrin (2), quercetin 3,7-di-O-α-L-rhamnopyranoside (3), quercitrin (4), desmanthin-1 (5), myricetin 3-O-(3″-O-galloyl)-α-L- rhamnopyranoside (6), (+)-catechin (7), benzyl O-β-D-glucopyranoside (8), 2-phenylethyl O-β-D-glucopyranoside (9), and corilagin (10) were isolated from the leaves of Ardisia splendens Pit. Based on an in vitro test against Coxsackie viruses A16 by SRB assay, only compounds 2, 5, and 10 exhibited activity against Coxsackie viruses A16 with IC50 values of 40.1, 32.2, and 30.5 μM, respectively. This result suggested that compounds 2, 5, and 10 might be potential agents for treating hand, foot and mouth diseases. Source

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