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권미향(Mee Hyang Kweon),박미경(Mee Kyung Park),나경수(Kyung Soo Ra),성하진(Ha Chin Sung),양한철(Han Chul Yang) 한국응용생명화학회 1996 Applied Biological Chemistry (Appl Biol Chem) Vol.39 No.2
Screening of anticoagulant activity was conducted for the hot water extracts of 73 kinds of medicinal herbs, 41 kinds of Korean edible plants. and 5 kinds of sea weeds using plasma recalcification test(Tr). In the first screening several extracts of the plants, Alisma calnaliculation, Corydalis ternate. Panax notoginseng. Allium sativum, Ganoderma lucidum, Codium fragile, showed high activities. When the plants were reextracted with various solvent conditions, acidic water extracts of Codium fragile showed the highest activity in APTT. A crude polysaccharide fraction(CF-1) was prepared by methanol reflux, ethanol precipitation, dialysis and lyophilization of the acid extracts. CF-1 comprised 80.8% total sugar consisting of arabinose, galactose and glucose as the main monomers, 8.7% protein, and 13.3% sulfate. The anticoagulant activity of CF-1 was not changed by pronase digestion, but decreased by periodate oxidation, and this indicated that the anticoagulant activity was attributed to the polysaccharide portion.
권미향,임은정,성하진 ( Mee Hyang Kweon,En Jung Lim,Ha Chin Sung ) 한국응용생명화학회 1998 Applied Biological Chemistry (Appl Biol Chem) Vol.41 No.1
During the screening for anti-complementary activity from 10 kinds of edible mushrooms, an alkali extract of Agaricus bisporus showed the highest activity through the complement fixation test. The crude anti-complementary material(AB-O) from Agaricus bisporus was obtained by the alkali extraction using 1 N NaOH containing 5% urea(65℃), followed by methanol reflux, dialysis and lyophilization. The fraction AB-O showed potent anit-complementary and anti-tumor activity against sarcoma-180 injected mice. The fraction AB-O was divided into 5 fractions(AB-20, AB-40, AB-60, AB-80, AB-A) by gradual acetone precipitation. Among them fraction AB-20 having the highest activity and yield was found to contain 39% carbohydrate and 46% protein. The anti-complementary protein-bound polysaccharide AB-20 consisted of glucose, arabinose, xylose, galactose and mannose in a molar ratio of 6.49 : 1.98 : 1.24 : 1.00 : 0.71, respectively and its main component amino acids were alanine(20.59%), isoleucine(16.85%), glutamine+glutamic acid(14.12%) and leucine (13.83%). The anti-complementary activity of AB-20 was decreased greatly by periodate oxidation, but decreased slightly by pronase digestion. This indicates that polysaccharide moiety is corelated with the anti-complementary activity and that protein is also involved in the activity.
냉이 ( Capsella bursa - pastoris ) 에탄올 추출물의 유리라디칼 소거 및 Xathine Oxidase 저해활성
홍정일(Jung Il Hong),권미향(Mee Hyang Kweon),나경수(Kyung Soo Ra),성하진(Ha Chin Sung),양한철(Han Chul Yang) 한국응용생명화학회 1995 Applied Biological Chemistry (Appl Biol Chem) Vol.38 No.6
To examine the characteristics of antioxidative compounds from Capsella bursa-pastoris, ethanol extracts were separated into five organic solvent fractions; hexane(Fr.H), diethyl ether (Fr.E), ethyl acetate(Fr.EA), butanol (Fr.B), and water(Fr.D) fractions. Fr.B showed the greatest electron donating ability and inhibitory effect on lipid peroxidation. Whereas Fr.E had the most excellent activity in the superoxide radical scavenging activity by xanthine/xanthine oxidase-cytochrome c reduction system. The inhibitory effect of each fraction on xanthine oxidase was also measured. Fr.E had the strongest inhibitory effect on xanthine oxidase and IC_(50) was 5.65 ㎍. The results indicate that the superoxide radical scavenging activity of Fr.E is caused by the inhibitory effect on radical generating system of xanthine oxidase. Also the order of inhibitory effect on xanthine oxidase was Fr.B$lt;Fr.EA$lt;Fr.E. But Fr.D had not an effect on xanthine oxidase. The inhibition type of Fr.E on xanthine oxidase turned out to be a noncompetetive inhibition. The inhibition by Fr.E maybe due to nonspecific binding to protein. Yet in the reaction system contained about 50 fold amount of other proteins, the inhibitory effect of FrEA on xanthine oxidase still remained above 60%.