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수종생약의 Brine Shrimp 독성에 관한 연구(I)
김윤철,김정희,Kim, Youn-Chul,Kim, Jeung-Hee 한국생약학회 1993 생약학회지 Vol.24 No.3
Brine shrimp toxicity of water extracts of twenty three crude drugs was tested by the brine shrimp bioassay. Eight crude drugs were shown to have 100% mortality in $1000{\;}{\mu}g/ml$. They were fractionated by Amberlite XAD-2 column chromatography and were tested by the brine shrimp bioassay. Methanol fraction of Rhei Rhizoma $(LC_{50}=49.60{\;}{\mu}g/ml)$ and Cantharis $(LC_{50}=54.08{\;}{\mu}g/ml)$ were shown to have potent brine shrimp toxicity in this test.
김윤철(Youn Chul Kim),정세준(Sei Joon Jeong),김형민(Hyung Min Kim) 대한약학회 1997 약학회지 Vol.41 No.2
Effects of the aqueous extract of Aquilariae Lignum (Thymelaeaceae) on the allergic reactions were investigated. Oral administration of this extract (50, 250, and 500mg/kg) exhibited a dose-dependent inhibition on passive cutaneous anaphylactic reactions in rats. Administrations of this extract (500mg/kg, i.p.) at 60 min before and 5, 10 min after the compound 48/80 treatment (8mg/kg, i.p.) decreased the mortality rates to 0, 0, and 14.2%, respectively. The aqueous extract of Aquilariae Lignum (0.05 ~ 1.6mg/ml) showed a dose-related inhibition on histamine release from rat peritoneal mast cells. The morphological examination also clearly showed that the aqueous extract of Aquilariae Lignum prevented the degranulation of mast cells in rats.
김윤설(Youn Seol Kim),정세준(Sei Joon Jeong),신화우(Hwa Woo Shin),김윤철(Youn Chul Kim) 대한약학회 1998 약학회지 Vol.42 No.2
One hundred and seventeen crude drugs were screened for DNA-binding activity in vitro. The DNA-methyl green assay is a useful biochemical screen for the detection or development of biologically active compounds which bind to DNA. This assay is based upon the fact that free methyl green undergoes rapid spontaneous molecular rearrangement to its colorless carbinol base so that the liberation of the dye from DNA by displacement can be followed spectrophotometrically as a decrease in absorbance at 65Onm. Seven methanolic extracts of crude drugs including Cinnamomi Cortex spissus, Coicis Semen, Coptidis Rhizoma, Perillae Semen, Plantaginis Semen, Polygalae Radix and Zanthoxyli Fructus showed less than 2,000mcg/ml as their IC50 values. The active principles of Plantaginis Semen and Zanthoxyli Fructus were transferred into organic solvents, which showed the IC50 values with 588 and 574mcg/ml, respectively. These fractions have been selected for isolation of biologically active constituents.
오수목과탕(吳茱木瓜湯)의 자유(自由)라디칼 소거활성(演去活性) 및 肝(간) 세포(細胞) 보호효과(保護效果)
정옥삼,윤용갑,김윤철,Jeong, Ok-Sam,Yun, Young-Gab,Kim, Youn-Chul 대한한의학방제학회 2005 大韓韓醫學方劑學會誌 Vol.13 No.2
In order to find the new hepatoprotective agents preliminary screening of twelve prescriptions which have been used for the treatment of hepatic disease in Oriental traditional medicine has been carried out. Both DPPH free radical scavenging and hepatoprotective effect on tacrine-induced cytotoxicity in Hep G2 cells are performed. Osumokkya-tang which is one of the prescription belongs to interior-warming properties showed the DPPH free radical scavenging effect as well as hepatoprotective activity significantly. It is also suggested that its hepatoprotective effect is derived from Chaenomelis Fructus.
정세준,안년형,김윤철,Jeong, Sei-Joon,Ahn, Nyeon-Hyung,Kim, Youn-Chul 한국생약학회 1998 생약학회지 Vol.29 No.1
From the 60% aqueous methanolic fraction of Moutan Cortex Radicis two hyaluronidase inhibitors were isolated and their structures were elucidated by spectroscopic methods. Their structures were identified as paeoniflorin (com-pound I) and oxypaeoniflorin (compound II). Compound I and II exhibited hyaluronidase inhibitory activities with $IC_{50}$ of 1.71 and 1.73mM, respectively.
용담의 RAW 264.7 세포주에서의 Nitric Oxide 생성 저해물질
김나영,강태현,김도훈,김윤철,Kim, Na-Young,Kang, Tai-Hyun,Kim, Do-Hoon,Kim, Youn-Chul 한국생약학회 1999 생약학회지 Vol.30 No.2
Bioassay-guided fractionation of a $H_2O$ extract of the roots of Gentiana scabra has furnished 5-(hydroxymethyl)-2-furfural (1) as an inhibitory compound for nitric oxide (NO) production in murine macrophage RAW 264.7 cells stimulated with $interferon-{\gamma}$ plus lipopolysaccharide. Compound 1 showed the moderate inhibition of NO production with $IC_{50}$ value of $803\;{\mu}M$.
정세준,전기용,강태현,고응배,김윤철,Jeong, Sei-Joon,Jun, Ki-Yong,Kang, Tai-Hyun,Ko, Eung-Bae,Kim, Youn-Chul 한국생약학회 1999 생약학회지 Vol.30 No.1
From the ethyl acetate fraction of the methanol extract of the fruits of Opuntia ficus-indica var. saboten, two dihydroflavonois were isolated and identified as (+)-trans-dihydrokaempferol (1) and (+)-trans-dihydroquercetin (2) by spectroscopic methods.
수종의 생약 물 추출물의 BNL cl.2 Cells 보호효과
강태현,김도훈,고용석,김은철,김윤철,Kang, Tai-Hyun,Kim, Do-Hoon,Ko, Yong-Suk,Kim, Eun-Chul,Kim, Youn-Chul 한국생약학회 1999 생약학회지 Vol.30 No.2
The protective effects of the water extracts of nine kinds of medicinal herbs, which have been reputed to having the hepatoprotective activity in Chinese herbal medicine, on BNL cl.2 cells using a MTT assay were investigated. Five extracts including Coriolus versica, Curcuma longa, Phellinus linteus, Po-lygonum aviculare, and Salvia miltiorrhiza showed the protective effects on BNL cl.2 cells damaged by $CCl_4$ with $ED_{50}$ values of less than $100\;{\mu}g/ml$. Silymarin had been used as a positive control.
정세준,고용석,안년형,김윤철,Jeong, Sei-Joon,Ko, Yong-Seok,Ahn, Nyeon-Hyung,Kim, Youn-Chul 한국생약학회 1998 생약학회지 Vol.29 No.3
Hyaluronidase is one of the mucopolysaccharide-splitting enzyme and is related to the permeability of the vascular system and inflammation. An anti-hyaluronidase assay guided fractionation of the methanolic extract of Uncariae Ramulus et Uncus has furnished a pentacyclic triterpene, ursolic acid (compound I). Compound I exhibited hyaluronidase inhibitory activity with $IC_{50}$ value of 0.15 mM, and disodium cromoglycate showed the inhibitory activity with $IC_{50}$ value of 1.78 mM as a positive control.