• 한국식품영양과학회지
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• 제30권1호
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• pp.97-101
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• 2001

This study was done to investigate the protective effects of Diospyrus kaki Folium on carbon tetrachloride intoxicated rats. Male Sprague-Dawley rats (200~230g) was used. Experimental groups were divided into normal group and $CCl_{4}$-treated group and then $CCl_{4}$-treated groups were divided into 7 groups: only $CCl_{4}$-treated group, methanol extract pretreated group, butanol fraction pretreated group and $H_{2}O$ fraction pretreated group, $CCl_{4}$ treated groups were injected with $CCl_{4}$ 0.6 mg/kg (ip). The activities of ananine aminotransferasein hexane, chloroform and $H_{2}O$ fraction pretreated groups were significantly decreased (p<0.05) compared to the only $CCl_{4}$-treated group and also activity of aspartate aminotransferase and hepatic malondialdehyde content in $H_{2}O$ fraction pretreated group were significantly decreased (p<0.05) compared to the only $CCl_{4}$-treated group. The activity of alkaline phosphatase in chloroform and $H_{2}O$ fraction pretreated groups were decreased compared to the only $CCl_{4}$-treated group but the difference was not statistically significant. The activity of ${\gamma}$-glutamyltranspeptidase in hexane, chloroform and ethylacetate fraction pretreated groups were significantly decreased (p<0.05) compared to the only $CCl_{4}$-treated group. The contents of cholesterol and triglyceride were not influenced in any fraction pretreated groups, but HDL-cholesterol content in hexane and chloroform fraction pretreated groups were significantly increased (p<0.05) compared to the only $CCl_{4}$-treated group. Therefore, these results demonstrate a possible hepatoprotective role of $H_{2}O$ fraction of Diospyrus kaki Folium methanol extract in carbon tetrachloride intoxicated rats.

• 한국식생활문화학회지
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• 제18권5호
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• pp.443-456
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• 2003

The lyophilization of the solution extracted from 60 percent of acetone applied to persimmon leaves, the compounding process in accordance with the solution's concentration, and the gel filteration through Sephadex G-50 of biologically activated substances obstructing enzyme activity, such as tyrosinase, xanthine oxidase, and angiotesin converting enzyme (ACE) led to the assumption that polyphenol was the compound serving as biologically activated substances obstructing enzyme activity. Xanthine oxidase involved in pruine metabolism oxidizes hypoxanthine to xanthine and xanthine to uric acid. In the continuous study for natural compound, nine flavan-3-ols have been isolated from the persimmon leaves. The structures of (+)-catechin, (+)-gallocatechin, procyanidin B-1, pyrocyanidin C-1, prodelphinidin B-3, gallocatechin-$(4{\alpha}{\rightarrow}8)$-catechin, procyanidin B-7-3-O-gallate, procyanidin C-1-3'-3'-3'-O-trigallate and (-)-epigallocatechin-$(4{\alpha}{\rightarrow}8)$-epigallocatechin-$(4{\alpha}{\rightarrow}8)$-catechin were established by NMR and their inhibitory effect on xanthine oxidase activity was investigated. Procyanidin B-7-3-O-gallate, (-)-epigallocatechin-$(4{\alpha}{\rightarrow}8)$-epigallocatechin-$(4{\alpha}{\rightarrow}8)$-catechin and procyanidin C-1-3'-3'-3'-O-trigallate showed 94%, 90.69%, 80.90% inhibition at $100\;({\mu})M$ and inhibited on the angiotensin converting enzyme respectively. Procyanidin B-7-3-O-gallate and procyanidin C-1-3'-3'-3'-O-trigallate showed 66%, 63% inhibition at $100\;({\mu})M$ and inhibited on the xanthine oxidase competitively. Procyanidin C-1-3'-3'-3'-O-trigallate showed 70% inhibition at $100\;({\mu})M$ and inhibited on the tyrosinase competitively.

• Applied Biological Chemistry
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• 제45권4호
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• pp.212-217
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• 2002

옛부터 민간 약제로 사용했던 감나무 잎을 식품, 화장품 기능 생물 신소재로 활용하기 위해 감나무잎의 주성분으로 알려진 폴리페놀 화합물을 분리하고 생리활성 기능을 조사하였다. 감나무 잎을 60%의 아세톤으로 추출한 용액을 동결 건조시켜 농도별로 조제하고 glucosyltransferase, tyrosinase 효소저해를 관찰한 결과 glucoslytransferase는 $1.8{\times}10^{-1}$ mg/ml에서 82.84% 저해를, tyrosinase는 0.8 mg/ml에서 21,65% 저해 활성이 확인되었다. Sephadex G-50으로 gel filtration한 결과 fraction 1, 2, 3, 4, 5로 분획되었고 이중 fraction 1, 2에서 효소 저해 활성을 나타내었다. 활성 분획물의 물질군을 확인하기 위해 proteinase K 처리와 멸균처리한 결과 효소저해에 영향은 없어 활성물질군은 단백질군이 아니며, UV spectrum에서 자외선 영역에 최대 흡광치를 보여주므로 페놀링을 갖는 화합물로 추정하게 되었다. 추정화합물을 Sephadex LH-20, MCI-gel 및 Bondapak $C_{18}$ column에서 분리한 결과 F1 fraction에서 compound $1{\sim}4$가지 4종류의 화합물, F2 fraction에서는 compounds 5, 6, F3 fraction에서 compound 7, 8, 9를 순수 정제하여 재결정하였다. 분리된 화합물은 TLC 발색반응에서 flavan-3-ol 골격을 기본으로 하는 축합탄닌 반응을 보였고 전개정도에서 monomer가 2종류, dimer가 3종류, trimer가 1종류로 확인되었다.