• 생약학회지
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• 제12권4호
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• pp.208-210
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• 1981

From the leaves of Polygonum sachalinense Fr. Schm. (Polygonaceae) quercetin, mp $316{\sim}8^{\circ}$, and avicularin, mp 216{\sim}6^{\circ},\;[{\alpha}]^D_{20}-152^{\circ}$, were isolated and characterized by spectral data. Both are first isolation from this plant.

• 생약학회지
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• 제45권2호
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• pp.93-100
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• 2014

The Acer tegmentosum (3 kg) were extracted with boiled water and the freeze dried extract powder was partitioned with $CH_2Cl_2$, EtOAc, n-BuOH and $H_2O$, successively. From the EtOAc and n-BuOH fraction, six phenolic compounds were isolated through the silica gel, octadecyl silica gel and sephadex LH-20 column chromatography. On the basis of spectroscopic methods, such as $^1H$-NMR and $^{13}C$-NMR, and LC/MS, the chemical structures of the compounds as feniculin (1), avicularin (2), (+)-catechin (3), (-)-epicatechin (4), salidroside (5) and 6'-O-galloylsalidroside (6). In this study, compounds 1 and 2 have been first isolated from the A. tegmentosum. To provide insight into the effects of six compounds isolated from A. tegmentosum on inflammation, we investigated its effect on nitric oxide (NO) production in RAW 264.7 cells using lipopolysaccharide (LPS) stimulation. Compounds 1 and 6 slightly repressed NO production. Also, compounds 3 and 4 inhibited NO secretion with statistical significance. However, compounds 2 and 5 did not show any inhibitory effect on NO production.

• 생약학회지
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• 제37권3호
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• pp.177-183
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• 2006

Six compounds were isolated from EtOAc soluble fraction of the leaves of Rhododenderon schlipenbachii. On the basis of spectral data, they were identified as quercetin (1), juglanin (2), avicularin (3), quercitrin (4), afzelin (5), and hirsutrin (6), respectively.

• Natural Product Sciences
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• 제21권3호
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• pp.170-175
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• 2015

The present study aims to detect the rare flavonoids isolated from the leaves of Persicaria glabra. The known flavonoids: quercetin (1), isorhamnetin (2), avicularin (3) and new one isorhamnetin-3-O-α-L-(6''-E-p-coumaroyl)-rhamnoside (4) were identified by HPLC, UV, IR and NMR. P. glabra has used traditionally for its analgesic, anti-inflammatory and anti-rheumatic properties. To find out the ingredients responsible for the efficiency of this plant, we have used to study the anti-microbial and anti-inflammatory activities of different extracts.

• 생약학회지
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• 제38권3호통권150호
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• pp.291-295
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• 2007

Eight compounds were isolated from the whole plants of Euphorbia supina (Euphorbiaceae) through repeated silica gel, YMC gel and Sephadex LH-20 column chromatography. Their chemical structures were elucidated as 7-hydroxy-6-methoxycoumarin (scopoletin) (1), p-hydroxybenzaldehyde (2), methyl gallate (3), gallic acid (4), quercetin (5), quercetin $3-O-{\alpha}-L-arabinofuranoside$ (avicularin) (6), kaempferol $3-O-{\alpha}-L-arabinofuranoside$ (juglanin) (7) and kaempferol $3-O-{\beta}-D-glucopyranoside$ (astragaline) (8) by spectroscopic (NMR and MS) analysis.

• Natural Product Sciences
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• 제27권4호
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• pp.280-283
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• 2021

Cercidiphyllum japonicum is being used for the treatment of obesity and liver fibrosis in Korean local clinics. In the present study, we tried to develop an analytical methodology for the determination of the chemical markers of Cercidiphyllum japonicum. Four chemicals, maltol (1), chlorogenic acid (2), quercetin (3), and avicularin (4), were selected for method validation, and the analytical conditions were optimized and validated using high-performance liquid chromatography coupled with an ultraviolet detector (HPLC-UV). Additionally, the seasonal variations of four markers were monitored every month for six months. The contents of four chemicals markers were most detected in a sample collected in June.

• 한국응용과학기술학회지
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• 제31권4호
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• pp.771-780
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• 2014

니아울리 잎 추출물의 항산화 효능과 성분 분석에 관한 연구를 시행하였다. 실험에 사용한 시료는 건조된 니아울리 잎의 50% 에탄올 추출물, 에틸아세테이트 분획 및 아글리콘 분획을 이용하였다. 자유라디칼(1,1-phenyl-2-picrylhydrazyl, DPPH) 소거활성($FSC_{50}$)은 에틸아세테이트 분획이 $10.05{\mu}g/mL$로, 지용성 항산화제로 알려진 (+)-${\alpha}$-tocopherol ($8.89{\mu}g/mL$)과 유사한 효과를 나타내었다. 루미놀 발광법을 이용한 $Fe^{3+}-EDTA/H_2O_2$ 계에서 생성된 활성산소종(reactive oxygen species, ROS)에 대한 니아울리 잎 추출물의 총 항산화능($OSC_{50}$)에서 에틸아세테이트 분획은 $1.61{\mu}g/mL$, 아글리콘 분획은 $1.07{\mu}g/mL$를 나타냈다. 에틸아세테이트 분획과 아글리콘 분획 모두 항산화 활성이 매우 큰 비교 물질인 L-ascorbic acid ($1.50{\mu}g/mL$)와 비슷한 활성산소 소거활성을 나타내었다. Rose-bengal로 광증감된 $^1O_2$에 의한 세포손상에 대한 세포보호능 측정에서 추출물 및 분획 모두 농도 의존적($5{\sim}50{\mu}g/mL$)으로 세포보호 활성을 나타내었다. 특히 아글리콘 분획과 50% 에탄올 추출물의 ${\tau}_{50}$은 $10{\mu}g/mL$에서 각각 158.80 min, 50.1 min으로 지용성 항산화제로 알려진 (+)-${\alpha}$-tocopherol (38.0 min)보다 더 큰 세포 보호 효과를 나타내었다. TLC와 HPLC를 이용하여 니아울리 잎 추출물의 에틸아세테이트 분획으로부터 avicularin과 quercitrin이 존재함을 처음 확인하였다. 이상의 결과들은 니아울리 잎 추출물 또는 분획이 항산화 원료로서 화장품에 응용 가능함을 시사한다.

• Natural Product Sciences
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• 제15권4호
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• pp.234-240
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• 2009

Phytochemical investigation of the MeOH extract of the aerial parts of Bistorta manshuriensis resulted in the isolation of two cerebrosides, two lactams, six phenolic compounds and seven flavonoids. Their chemical structures were characterized by spectroscopic methods to be pinelloside (1), soyacerebroside I (2), pterolactam (3), 5-hydroxypyrrolidine-2-one (4), vanillic acid (5), caffeic acid methyl ester (6), protocatechuic acid (7), caffeic acid (8), 3,5-di-O-caffeoyl quinic acid methyl ester (9), chlorogenic acid methyl ester (10), avicularin (11), afzelin (12), quercetin (13), isoorientin (14), quercetin 3-O-${\beta}$-D-glucoside (15), quercitrin (16), and luteolin (17). The isolated compounds (1 - 4, 7, 12, 14) were isolated for the first time from this plant source and the compounds 1 - 4, 9 and 10 were first reported from the genus Bistorta. Compound 17 exhibited moderate cytotoxicity and compound 6 exhibited weak cytotoxicity against four human cancer cell lines in vitro using an SRB bioassay.

• Natural Product Sciences
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• 제10권1호
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• pp.35-39
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• 2004

Aldose reductase (AR), the key enzyme of the polyol pathway, is known to play important roles in the diabetic complications. The inhibitors of AR, therefore, would be potential agents for the prevention of diabetic complications. In order to clarify the structural requirements of flavonoids for aldose reductase inhibitory activity, thirty flavonoids were examined. Among the thirty flavonoids, flavonols such as quercetin (5), reyneutrin (7), quercitrin (9), isoquercitrin (11), and avicularin (14) were found to exhibit much stronger AR inhibition. Lonicerin (10), amentoflavone (27) and sophoraflavanone B (30) were also showed strong inhibitory activity. Especially, quercitrin and reyneutrin exhibited the most inhibitory potency on rat lens (RL) AR. The results suggested that flavonol having the 7-hydroxyl and/or catechol moiety at the B ring exhibit strong activity. In addition, flavonols having 3-O-monosaccharide also showed stronger inhibition than free flavonols at the 3-position. These results suggested that quercitrin and reyneutrin are attributed to be the promising compounds for the prevention and/or treatment of diabetic complications.

• 생약학회지
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• 제39권3호
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• pp.260-264
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• 2008

Eight compounds were isolated from the EtOAc soluble fraction of Euphorbia supina MeOH extract as the radical scavengers for antioxidant activity. Their structures were identified as kaempferol (1), quercetin (2), juglanin (3), avicularin (4), astragalin (5), isoquercitrin (6), hyperin (7), and nicotiflorin (8) by spectroscopic analysis. The antioxidant activity was evaluated by the ORAC (oxygen radical absorbance capacity) assay, which measures scavenging activity against peroxy radicals induced by 2,2'-azobis (2-methylpropionamidine) dihydrochloride, and the ORAC value is expressed as relative trolox equivalent. Compounds 4, 6, and 7 exhibited potent antioxidant activity, whereas the other compounds showed weaker activity than trolox.