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Jae Sue Choi,Ji Hyeon Lee,Hae Jin Park,Hyung Geun Kim,Han Suk Young,Sook Im Mun 한국생약학회 1994 생약학회지 Vol.24 No.4
The antioxidant activity of methanol extracts of plants and marine algae was tested by using 1, 1-diphenyl-2-picrylhydrazyl(DPPH), Five plant extracts(Prunus davidiancc, Eriobotrya japonica, Artemisia iwayomogi, Stirodella tolyrrhiza and Ulmus davidiana) and two algae (Ecklonia stolonifera .and Symphycoladia latiuscula) were found to be the most effective in DPPH radical scavenging activity. The methanol extract obtained from the stems of Prunus davicliana was fractionated with several solvents. The ethylacetate soluble fraction exhibiting the strongest antioxidant activity was further purified by repeated silica gel and Sephadex LH-20 column chromatography. Antioxidant flavonoids and flavonoid glycosides were isolated and the most active ones was identified as (+)-catechin by MS, ¹H-NMR and <sup>13</sup>C-NMR. Its antioxidant activity was higher than that of vitamin C.
Phytochemical Study on Melandrium firmum (3)
Jae Sue Choi,Won Sick Woo 한국생약학회 1985 생약학회지 Vol.16 No.4
In the previous reports (1,2) isolation of α-spinasterol-D-glucoside, linarin, gypsogenin, gypsogenic acid and quillaic acid from M. firmum (Caryophyllaceae). In the course of our continuous work on the plant, a phenolic amide was isolated and characterized as N-p-hydroxy-benzoyl-5-hydroxyanthranillic acid on the basis of chemical and spectral data. This is a first report of its occurrence in nature to the best of our knowledge. 1. Choi, J.S., Woo, W.S. and Chang, H.S. Proceeding of the 33rd Annual Convention of the Pharmaceutical Society of Korea, 1984, p-95. 2. Choi, J.S., Woo, W.S. and Kang. S.S. Proceeding of the 15th Annual Convention of Korean Society of Pharmacognosy, 1984, p-A-10.
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.
Jae Sue CHOI,Hyun Ah Jung,Himanshu Kumar Bhakta,Hajime Fujii,민병선,Chan Hum Park,Takako Yokozawa 대한약학회 2016 Archives of Pharmacal Research Vol.39 No.3
Oligonol is a low-molecular-weight form of polyphenol that is derived from lychee fruit extract and contains catechin-type monomers and oligomers of proanthocyanidins. This study investigates the anti-diabetic activities of oligonol via a-glucosidase and human recombinant protein tyrosine phosphatase 1B (PTP1B) assays, as well as its anti-Alzheimer activities by evaluating the ability of this compound to inhibit acetylcholinesterase (AChE), butyrylcholinesterase (BChE), and b-site amyloid precursor protein cleaving enzyme 1 (BACE1). Oligonol exhibited potent concentration-dependent anti-diabetic activities by inhibiting a-glucosidase and PTP1B with IC50 values of 23.14 lg/mL and 1.02 lg/mL, respectively. Moreover, a kinetics study revealed that oligonol inhibited a-glucosidase (Ki = 22.36) and PTP1B (Ki = 8.51) with characteristics typical of a mixed inhibitor. Oligonol also displayed potent concentration-dependent inhibitory activity against AChE and BChE with IC50 values of 4.34 lg/mL and 2.07 lg/mL, respectively. However, oligonol exhibited only marginal concentrationdependent BACE1 inhibitory activity with an IC50 value of 130.45 lg/mL. A kinetics study revealed mixed-type inhibition against AChE (Ki = 4.65) and BACE1 (Ki = 58.80), and noncompetitive-type inhibition against BChE (Ki = 9.80). Furthermore, oligonol exhibited dosedependent inhibitory activity against peroxynitrite (ONOO-)-mediated protein tyrosine nitration. These results indicate that oligonol has strong preventative potential in diabetes mellitus and in Alzheimer’s disease.
A Flavonol Diglucoside from the Leaves of Brassica juncea
Jae Sue Choi,Jung Eun Kim,Jae I Kim,Hong Sik Cheigh,Takako Yokozawa 한국생약학회 2000 Natural Product Sciences Vol.6 No.4
A flavonol diglucoside was isolated from the leaves of Brassica juncea L. The structure of the compound was elucidated as isorhamnetin 3,7-di-O-β-D-glucopyranoside (1) on the basis of chemical and spectral evidence.
HyeSookKang,HaeYoungChung,DaeSeokByun,JaeSueChoi 대한약학회 2003 Archives of Pharmacal Research Vol.26 No.1
A furanofuranoid lignan glycoside, with radical scavenging on peroxynitrite, total reactive oxygen species (ROS) and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical, was isolated from the rhizome of Salvia miltiorrhiza and characterized as (+)-1-hydroxypinoresinol-1- O- b-D-glucoside based on spectroscopic evidence. The compound exhibited peroxynitrite, total ROS and DPPH radical scavenging activities with IC50 values of 3.23 ± 0.04, 2.26 ± 0.07 and 32.3 ± 0.13 mM, respectively. Penicillamine, Trolox (6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid) and L-ascorbic acid, acting as positive controls, showed radical scavenging activities with IC50 values of 6.72 ± 0.25, 1.43 ± 0.04 and 11.4 ± 0.07 mM, respectively.