• 생약학회지
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• 제33권3호통권130호
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• pp.177-181
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• 2002

This study was carried out to investigate the antioxidative activities of Rosa davurica Pall for the purpose of development of novel antioxidant from natural products. Antioxidant activities of four different parts of Rosa davurica Pall such as fruit, leaf, stem and root were examined by measuring the radical scavenging effect on 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical. The methanol extract from the root of Rosa davurica Pall showed the highest antioxidative activity among 16 samples tested. And, we also tested radical scavenging effects of 5 different extract compartments(Hexane, $CHCl_3$, EtOAc, BuOH and $H_2O$ fraction). EtOAc and BuOH fractions from the root of Rosa davurica Pall exhibited antioxidative activities higher to those of natural, ${\alpha}-tocopherol$ or synthetic antioxidants, BHT. The antioxidative substance of EtOAc fraction from the root of Rosa davurica Pall was successively purified with silica gel adsorption column chromatography and Sephadex LH-20 column chromatography. The purified active substance was isolated as crystal and identified as (+)-catechin by $^{l}H-NMR$ and $^{13}C-NMR$. This compound exhibited DPPH radical scavenging activity with the $IC_50$ value of $1.7\;{\mu}g/ml$. In the analysis of catechin content, the leaf extracts contained the highest catechin, and fruit extracts contained the lowest catechin. Considering antioxidative activity on DPPH assay, the extracts of Rosa davurica Pall showed a possibility to be used as a new material for natural antioxidant and functional food.

• Journal of the Korean Wood Science and Technology
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• 제45권4호
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• pp.456-462
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• 2017

Japanese anise (Illicium anisatum L.) twigs were collected and ground after drying, then immersed with 50% aqueous acetone for 3 days. After filtration, the extracts were fractionated with n-hexane, chloroform ($CHCl_3$), ethylacetate (EtOAc) and $H_2O$, and then freeze-dried after condensation. A portion of EtOAc soluble fraction (5.7 g) was chromatographed on a Sephadex LH-20 column with various aqueous $MeOH-H_2O$. Compound 2 and compound 3 were isolated from fraction 8 and 5, respectively. Compound 1 and compound 4 were isolated after rechromatography of fraction 7. The isolated compounds were elucidated as (+)-catechin (1), taxifolin (2), taxifolin-3-O-${\beta}$-D-(+)-xylopyranose (3) and quercitrin (4) by spectral and literature data, and by comparison with the authentic samples. Of the isolated compounds, taxifolin (2), taxifolin-3-O-${\beta}$-D-(+)-D-xylopyranose (3) and quercitrin (4) were isolated, for the first time, from the extracts of japanese anise twigs.

• 한국유기농업학회지
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• 제23권3호
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• pp.535-547
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• 2015

본 연구는 베리와 그 부산물들의 영양학적 가치와 더불어 이들의 식품 내 활용 가능성을 확인하고자 국내생산 베리 중 대표적 베리인 블루베리, 오디 그리고 복분자와 그들 부산물의 이화학적 특성과 페놀화합물 함량변화를 비교/분석하였다. 수분함량은 통 베리 시료가 그들 부산물의 함량보다 유의적으로 높게 나타났으며, 특히 복분자와 그 부산물의 수분함량은 차이가 가장 컸다. pH는 오디와 오디 부산물에서 각각 4.03, 5.18로 가장 높게 나타났다. 총 폴리페놀과 플라보노이드의 함량은 블루베리 부산물에서 24.81와 24.13 mg/g으로 가장 높았으며, 안토시아닌 함량은 오디 부산물에서 53.27 ug/g으로 가장 높았다. Cyanin chloride는 오디와 복분자 과일에서만 측정되었으며, epigallocatechin, gallocatechin과 isorhamnetin은 블루베리에서만 측정되었다. Catechin (hydrate)과 epicatechin의 경우에는 블루베리를 제외한 오디와 복분자의 통 과일과 부산물에서 유의적인 차이가 나타났으며, gallic acid는 오디에서, quercetin 3-D-galactoside는 블루베리에서 통 과일과 부산물간 유의적인 차이가 조사되었다. Apigenin, luteolin은 오디류에서만 측정되었으며 특히 부산물에서 그 함량이 높았다. Naringenin은 각각의 베리 부산물에서 함량이 높았으나, rutin (trihydrate)과 quercetin은 블루베리를 제외한 오디와 복분자의 통 베리에서 부산물보다 높게 검출되었다. Kaempferol 함량은 통 오디에서 15 ng/g으로 가장 높았다. 본 실험에 이용된 베리들은 성숙도 및 환경에 따라 서로 다른 결과를 나타날 수도 있겠으나, 본 연구결과는 각각의 통 베리의 유효성분을 조사한 것 뿐 아니라 그들의 부산물까지도 가축 사료 첨가제 및 식품 소재로써 활용 가능성을 나타낸 연구라 할 수 있다.

• Journal of Applied Biological Chemistry
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• 제43권4호
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• pp.273-276
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• 2000

In the course of surveying the anti-plaque agents for dental caries prevention, the extract of Korean green tea leaves (KGTL) was tested for inhibitory activity against Streptococcus mutans adhering to glass surfaces in the presence of crude glucosyltransferase (GTase). The extracts of KGTL showed a positive inhibitory activity against GTase. The active compound was purified through Sephadex LH-20 and MCI gel CHP-20P columns. A positive reaction was shown in the anisaldehyde-$H_2SO_4$ test, which confirmed the condensed tannin. The inhibitory compound was identified as 3-galloylprocyanidin $B_3$ through IR, negative FAB-mass, and $^{1}H$-NMR spectroscopic analyses. Acetone extract and 3- galloylprocyanidin $B_3$ of KGTL showed inhibitory effect against GTase. The percent of inhibition was determinated to be 71.84% (P<0.01) with 10 mM 3-galloylprocyanidin B3. The 3-galloylprocyanidin $B_3$, which possessed a galloyl, showed a higher inhibitory activity against glucosyltransferase than monomeric (+)-catechin and procyanidine $B_3$ which had no galloyl group.

• 한국식품영양과학회지
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• 제22권3호
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• pp.266-272
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• 1993

우리들의 식이중에 함유되어 있는 플라보노이드 화합물들이 니트로소화합물의 생성에 미치는 영향을 알아보기 위하여 생체내에서 일어나는 니트로소화 과정을 아질산염, 프로린과 시료를 동시에 투여하여 생성된 니트로소프로린 함량을 시험관 및 생체조건하에서 HPLC로서 측정하였다. 그 결과, 잘 알려진 ascorbic acid, KSCN과 더불어 catechin, chlorogenic acid, morin, luteolin, luteolin-7-O-glucoside, naringenin 등은 아질산염 소거에는 상당한 효과가 있는 것으로 나타났으나, 니트로소프로린 생성에 대해서는 ascorbic acid와 chlorogenic acid를 제외한 나머지 화합물들은 거의 영향을 미치지 않거나 오히려 그 생성을 촉진시키는 것으로 나타났다.

• Natural Product Sciences
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• 제16권3호
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• pp.169-174
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• 2010

The seed of Phaseolus calcaratus Roxburgh (PHCR) is traditionally used for anti-pyretic and antiinflammatory effects. Although these effects are believed to be related to its antioxidant potential, little information is available for the mechanisms by which PHCR seed might scavenge free radicals or otherwise act as an antioxidant. In the present study, we purified some fractions from the ethanol extract of PHCR seed and evaluated each fraction's ability to scavenge free radicals generated by cell-free systems. We also identified active compound that is putatively responsible for free radical scavenging by analyzing NMR spectra. PHCR samples exhibited a concentration-dependent radical scavenging activity against hydroxyl radicals, superoxide anions, and DPPH radicals. Of the samples tested, a methanol-eluted sub-fraction from the PHCR extract, named $FF_4$, scavenged these radicals more effectively than the other fractions. We identified catechin-7-O-$\beta$-Dglucopyranoside as the active compound responsible for free radical scavenging potential of $FF_4$.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2005년도 생물공학의 동향(XVI)
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• pp.368-372
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• 2005

Phytoestrogens are non-steroidal compounds found in a variety of plants, which exert estrogenic effects in animals. In this study, the useful compounds of pomegranate as preliminarily research for the developing of natural estrogen supplement were determined. The estrogenic activity of phytoestrogens in the pomegranate was estimated by using the Yeast Estrogen Receptor and E-screen assay. Estrogenic activity of all pomegranate extracts in the Yest Estrogen Receptor assay were not significant difference at all concentration. Whereas peel extracts of Iranian and domestic red pomegranate are significantly enhanced in the E-screen assay. When various pomegranate extracts enzyme and acid hydrolyzed, three aglycones of phytoestrogen, kaempferol, quercetin and catechin were detected. Peel extract of domestic red pomegranste contained more than kaempferol(87.0 mg%), quercetin(172.8 mg%)) and catechin(956.8 mg%) than other extracts. These differences in concentrations of key phytoestrogens among various extracts seemed to be responsible for their differences in estrogenic activities. Among these three compound, kaempferol showed the highest MCF-7 cell enhancing efface.

• Journal of the Korean Wood Science and Technology
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• 제48권6호
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• pp.888-895
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• 2020

Ulmus genus has excellent various physiological activities, including anti-ulcer, antioxidant, antibacterial, anti-cancer, immunity, and homeostasis maintenance effects, and it is known to have many additional drug effects And one of reasons for these excellentbiological activities is a flavan-3-ol chemical group in Ulmus genus. In this study a new flavan-3-ol compound was identified in Ulmus davidiana var. japonica. A flavan-3-ol,(2R,3S)-7-[(2S,3R,4R)-3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-2-(3,4-dihydroxyphenyl)-3,4-dihydro-2H-chromene-3,5-diol, named as catechin 7-O-beta-D apiofuranoside, was isolated from the stems and barks of Ulmus davidiana var. japonica for. suberosa, which is a species belonging to the genus Ulmus, growing throughout the Korea peninsula. The structure was elucidated by various spectroscopic methods including high-resolution TOF mass spectrometry, ¹H-NMR and ¹³C-NMR spectrometry and comparison with chemical structures of defined compounds.

• Preventive Nutrition and Food Science
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• 제6권2호
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• pp.107-111
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• 2001

Physical and chemical characteristics of four white-and one yellow-fleshed peach cultivars were compared at optimum maturity stage. In addition, differences of phenolic composition, polyphenol oxidase (PPO) activities and PPO isozyme patterns in two peach types were also investigated. There are no significant differences in firmness and color values between two peach types, except for "Yumyung", a white-fleshed peach with the highest firmness, and "Hwangdo", a yellow-fleshed peach with the highest yellowness (b)* value. In general, the soluble solid/titratable acidity ratios, ascorbic acid and total phenolic contents were significantly higher for white-fleshed peaches than those for yellow-fleshed peach (p<0.05). Three major phenolic compounds, catechin, neochlorogenic acid and chlorogenic acid, were found in both the white-and yellow-fleshed peaches. Among them, catechin was the predominant phenolic compound in the white-fleshed peaches, followed by neochlorogenic acid, and chlorogenic acid. Meanwhile, neochlorogenic acid was present in the highest level of the yellow-fleshed peach, but levels of two other phenolic compounds were lower. PPO activities of the white-fleshed peaches were generally higher than that of the yellow-fleshed peach, with the one major band and two minor bands, and there were no big differences in PPO isozyme patterns between two different peach cultivars.

• 약학회지
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• 제36권5호
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• pp.474-480
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• 1992

Astilbes rhizoma has been used for headache, arthralgia, chronic bronchitis and stomachalgia in traditional chinese medicine. The analgesic activities and their components of Astilbe chinensis var. davidii Rhizomes were evaluated. The ether and ethylacetate fractions of 70% EtOH extract showed considerable analgesic activities by acetic acid induced writhing method. Compound $1{\sim}5$ were isolated from ethylacetate fraction and identified as gallic acid, (+)-catechin, (+)-gallocatechin, bergenin and 11-O-galloylbergenin on the basis of spectroscopic methods. Among them (+)-gallocatechin showed stronger analgesic activity than that of other compounds.