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최재수(Jae Sue Choi),최진호(Jin-Ho Choi),박종철(Jong Cheol Park),양한석(Han Suk Young) 한국생약학회 1987 생약학회지 Vol.18 No.1
Previouslyl we reported on the isolation and structure elucidation of quercetin, avicularin, quercitrin and hyperin from the leaves of Rhododendron brachycarpum D. Don (Ericaceae). In this communication, the isolation of diterpenoid, grayanotoxin I, mp 247∼8˚ [α]_D=-5˚will be presented. 1) Choi, J.S., Choi, J.H., Young, H.S., Park, J.C. and Woo, W.S., Proceedings of 35th annual convention of the Pharmaceutical Society of Korea, 1986, p.108.
Nitrite Scavenging Effect by Flavonoids and Its Structure-Effect Relationship
Choi, Jae-Sue,Park, Si-Hyang,Choi, Jin-Ho The Pharmaceutical Society of Korea 1989 Archives of Pharmacal Research Vol.12 No.1
Nineteen flavonoids, five phenolics, two coumarins, maltol and L-ascorbic acid were tested as scavenger of nitrite which is believed to participate in the formation of N-nitroso compounds. Many were found to be potent scavenger and the five most potent ones were (+)-catechin, (-)-epicatechin, phloroglucinol, caffeic acid and L-ascorbic acid. The nitrite scavenging effect was higher at pH 1.2 than pH 3.0 and increased when the incubation time was longer. The possible relationship of structures to scavenging effect of the flavonoids tested was discussed.
Flavonoids from the leaves of rhododendron brachycarpum
Choi, Jae-Sue,Young, Han-Suk,Park, Jong-Cheol,Choi, Jin-Ho,Woo, Won-Sick The Pharmaceutical Society of Korea 1986 Archives of Pharmacal Research Vol.9 No.4
The flavonoids isolated form the leaves of rhododendron brachycarpum were identified as quercetin, avicularin, quercitrin and hyperin.
Phytochemical Study on Prunus davidiana
Choi, Jae-Sue,Woo, Won-Sick,Young, Han-Suk,Park, Jong-Hee The Pharmaceutical Society of Korea 1990 Archives of Pharmacal Research Vol.13 No.4
From the stem of Prunus davidiana, naringenin and its glucoside, kaempferol and its glucoside, dihydrokaempferol, kaempferide glucoside, hesperetin glucoside, quercetin glucoside, d-catechin and $\beta$-sitosterol glucoside were isolated.
Hypolipemic and Hypoglycemic Activities of Prunus davidiana in High Fat-Fed Rats
Choi, Jae-Sue,Suh, Suk-Soo,Young, Han-Suk,Park, Hee-Juhn The Pharmaceutical Society of Korea 1991 Archives of Pharmacal Research Vol.14 No.1
Blood lipid levels in rats with high fat-fed hyperlipemia were determined after intraperitoneal administration of a methanolic extract of Prunus davidiana Fr. stems. Administration of the methanolic extract for 6 days produced a significant decrease of blood triglyceride and total cholesterol, and the atherogenic index was also improved. In addition to the hypolipemic effect, the methanolic extract was also shown to be effective in reducing an elevated level of glucose in rats with hyperlipemia resulting from high-fat feeding. On the other hand, blood triglyceride and total cholesterol in rats fed with stock diet were not affected by administration of the methanolic extract even if there was a tendency to decrease. No significant change was also found in the level of glucose. Thus, it is suggested that this methanolic extract probably may increase the metabolic utilization only when fed with excess fat.
A Preliminary Study on Hypocholesterolemic and Hypoglycemic Activities of Some Medicinal Plants
Jae Sue Choi,Hae Young Chung,Han Suk Young 한국생약학회 1990 생약학회지 Vol.21 No.2
Total cholesterol level in mice with hypercholesterolemia was determined after intraperitoneal administration of the methanolic extract of some medicinal plants. From the data obtained, it was suggested that the methanolic extract of Elaeagnus crispa, Ixeris dentata, Prunus daroidiana, Eriobotrya japonica, Aralia elata and Phragmites communis produced a significant hypocholesterolemic effect. In the case of the extract of Saussurea diamantiaca, on the other hand, the total cholesterol level was markedly increased. The methanolic extract of Ixeris dentata, Prunus davidiana and Phragmites communis also decreased the level of blood glucose in alloxan-diabetic male albino mice while that of Eriobotrya japonica, Allium tuberosum, Houttuynia cordata and Eucommia japonica did not produce this effect.
Choi, Jae-Sue,Lee, Hee-Jung,Kang, Sam-Sik The Pharmaceutical Society of Korea 1994 Archives of Pharmacal Research Vol.17 No.6
Radical scavenging principles on 1, 1-diphenyl-2-picylhydrazyl(DPPH) radical were isolated from the seeds of Cassis tora L. Assignments of the^1H-{\;}and{\;}^{13}C-NMR$ data showed the active components to be an anthraquinone, alatemin nad two naphthopyrone glycosides, nor-rubro-fusarin-6-.betha.-D-glucoside(cassiaside) and rubrofusarin-6- -D-gentiobioside. Altemin showed more potent radical sacvenging effect than the others.