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Antitumor Activity of some Phenolic Components in Plants
Ryu, Shi-Yong,Choi, Sang-Un,Lee, Chong-Ock,Lee, Seung-Ho,Ahn, Jong-Woong,Zee, Ok-Pyo The Pharmaceutical Society of Korea 1994 Archives of Pharmacal Research Vol.17 No.1
The activity-guided fractionation of some medicinal plants led to yield five kinds of natural stilbene compounds namely 3, 5-dihydroxy-4'-methoxystillbene(I), rhapontigenin(II), reveratrol(III), rhaponticin(IV) and piceid(V) and two common flavonoids, apigenin(VI) and luteolin(VII) as active principles of the antitumor property, in vitro, against five kinds of human tumor cell lines, A-549, SK-OV-3, SK-MEL-2, XF-498 and HCT15.
In vitro antitumor activity of flavonoids from Sophora flavescens
Ryu, Shi Yong 대전대학교 韓醫學연구소 1997 한의학연구소 논문집 Vol.5 No.2
The cytotoxicity-guided fractionation of the roots of Sophora flavescens (Leguminosae) extracts led to the isolation of fifteen active principles 1∼15, responsible for the cytotoxicity against five kinds of cultured human tumor cell lines, i.e., A549(non small cell lung), SK-OV-3(ovary), SK-MEL-2(skin), XF498(central nerve system) and HCT-15(colon), evaluated by SRB method in vitro. Compounds 2∼14 were classified as unusual flavonoid occurred exclusively in this species and the proliferation of each examined tumor cells were significantly inhibited during the continuous exposure to compounds 1∼15 for 48 hours, respectively.
Ryu, Shi Yong,Oak, Min Ho,Kim, Kyeong Man 전남대학교 약품개발연구소 2000 약품개발연구지 Vol.9 No.1
Yomogin (1). an eudesmane sesquiterpene isolated from Artemisia princeps, was tested for the effects on the degranulation process of cultured mast cells and on the nitric oxide production in LPS-activated marine macrophages. It demonstrated a significant inhibition on the release of β-hexosaminidase from the cultured RBL-2H3 cells in a dose-dependent manner (IC_(50) value, 50 μM) and also exhibited a potent inhibition on the nitric oxide production from the activated RAW264.7 cells (IC_(50) value, 3 μM).
The Structure of Kushenol M from Sophora flavescens
Ryu, Shi-Yong,Lee, Seung-Ho,No, Zaesung,Kim, Kye-Young,Lee, Sueg-Geun,Ahn, Jong-Woong The Pharmaceutical Society of Korea 1995 Archives of Pharmacal Research Vol.18 No.1
The linkage pattem of two side chains i.e., a isopentenyl and a lavandulyl group in kushenol M(I), a flavonoid from Sophora flavescens was established by the aid of 2-D NMR techniques, especially DEPT, ${13}C-^1H$ COSY and COLOC experiments. Thus, I was unequivocally determined as (2R, 3R)-5, 7, 2', 4'-tetrahydroxy-6-isopentenyl-8-lavandulyflavanonol.
Antiviral Triterpenes from Prunella vulgaris
Ryu, Shi-Yong,Lee, Chong-Kyo,Lee, Chong-Ock,Kim, Hae-Soo,Zee, Ok-Pyo The Pharmaceutical Society of Korea 1992 Archives of Pharmacal Research Vol.15 No.3
Two triterpenes 1 and 2 with antiviral activity against Herpes simplex virus type 1 in vitro were isolated from Prunella vulgaris. Each compound caused a significant reduction in viral cytopathic effect when vero cells were exposed to them for 72 hours after viral challenge. They were identified as betulinic acid (1) and $2\alpha, 3\alpha$-dihydroxyurs-12-en-28-oic acid(2) on the basis of their spectroscopic properties. The antiviral activity of them was estimated as $EC_{50}=30\;\mu$g/ml(1) and $8\;\mu$g/ml(2), respectively by plaque reduction assay.
Antitumor Triterpense from Medicinal Plants
Ryu, Shi-Yong,Choi, Sang-Un,Lee, Seung-Ho,Lee, Chong-Ock,No, Zaesung,Ahn, Jong-Woong The Pharmaceutical Society of Korea 1994 Archives of Pharmacal Research Vol.17 No.5
Thirteen kinds of naturally occurring or derivatised thiterpenes, reported to have an antitumoral property, were reinvestigated on the basis of their direct cytotoxicity or the inhibitory activity on cell growth against five kinds of cultured human tumor cells, i.e., A-549, SK-OV-3, SK-MEL-2, XF-498 and HCT15, in vitro. Ursonic acid III, betulinic acid VIII, betulonic acid X and glycrrhetinic acid XI were exhibitied a marked inhibition on cell growth.
Antitumor activity of Trichosanthes kirilowii
Ryu, Shi-Yong,Lee, Seung-Ho,Lee, Sang-Un,Lee, Chong-Ock,No, Zaesung,Ahn, Jong-Woong The Pharmaceutical Society of Korea 1994 Archives of Pharmacal Research Vol.17 No.5
The activity fractionation upon the MeOH extract of the root of trichosanthes kirilowii led to the isolation of eight cucurbitane tritepense namely cucurbitacin .betha. (I), isocucurbitacin .betha.(II), cucurbitacin D(III), isocucurbitacin D(IV), 3-epi-isocucurbitacin .betha(V), dihydrocucurbitain .betha. (VI), dihydroisocucurgbitachin .betha. (VII) and dihydrocucurbitacin E (VIII), as active principles. All isolates were shown to exhibit significant cytotoxicity against cultured human tumor cells, including A-549, Sk-OV-3, Sk-MEL-2, XF-498 and HCT 15, with an exceptionally high potency.