• 대한의생명과학회지
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• 제18권1호
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• pp.35-41
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• 2012

Physiological activities of hot water extract and solvent fractions isolated from Astragalus membranaceus were examined and the antioxidative, fibrinolytic, thrombin inhibitory and a-glucosidase inhibitory activity were measured. The hot water extract of Astragalus membranaceus was fractionated into hexane, chloroform, ethyl acetate, butanol and water fractions, and each of these fractions was individually assayed. The antioxidative activities of ethyl acetate and chloroform fractions were 89.96% and 87.36%, respectively. Using the fibrin plate method, only the hot water extract showed a plasmin activity of 0.41 units/ml. The thrombin inhibitory activity of the ethyl acetate fraction was the highest with a value of 82.73%. The hot water extract displayed a-glucosidase inhibitory activity of 64.91%. In conclusion, the hot water extract and the ethyl acetate fraction can be used as materials for the development of biofunctional foods to prevent cardiovascular diseases.

• 대한의생명과학회지
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• 제16권4호
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• pp.271-277
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• 2010

This study was conducted to investigate the biological activities of Areca catechu L. The antioxidative, fibrinolytic, thrombin inhibitory, and ${\alpha}$-glucosidase inhibitory activities of Areca catechu L extracted with hexane, $CHCl_3$, ethyl acetate, butanol, and water were measured. The water fraction showed the highest extraction yield at 3.65% (w/w). The butanol, $CHCl_3$, water, and ethyl acetate fractions showed strong antioxidative activities at 81.6%, 87.1%, 88.0%, and 89.5%, respectively. The fibrinolytic activity was strong only in the ethyl acetate fraction at 0.84 plasmin units/ml. The 100-fold dilution of the water fraction had the strongest thrombin inhibitory activity at 59.2%. The 100-fold dilution of butanol fraction displayed the strongest ${\alpha}$-glucosidase inhibitory activity at 88.6%. In conclusion, the extracts of Areca catechu L hold promise for use in the development of biofunctional foods to prevent cardiovascular diseases.

• Applied Biological Chemistry
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• 제44권2호
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• pp.122-128
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• 2001

감귤류 유래 플라보노이드인 hesperidin 및 naringin과 이들의 agIycone 형태인 hesperetin 및 naringenin의 생리기능 활성에 대하여 동물(흰쥐 및 햄스터)실험을 통한 지질대사,인체 간종양 세포주 HepG2 세포를 이용한 암세포 생육 및 지질대사, 노화와 질병의 원인이 되는 불포화 지방산의 지질 과산화 억제 작용을 중심으로 고찰하였다. 이들 감귤류 플라보노이드는 흰쥐에서의 콜레스테롤 농도 저하작용 및 햄스터에서의 중성지질 농도 저하작용을 나타내었다. 이러한 대사 기작으로서 콜레스테를 및 중성지질 합성의 중요 조절효소로 알려진 acyl-CoA: cholesterol acyltransferase(ACAT) 및 phosphatidate phosphohydrolase(PAP) 활성이 in vivo 및 in vitro 실험계에서 현저히 저해되었으며, 특히 aglycone 형태의 플라보노이드에서 그 효과가 강하게 나타났다. 또한,이들 플라보노이드는 인체 간종양 세포주 HepG2 세포를 이용한 실험에서 암세포 생육 억제 및 세포내 콜레스테롤과 중성지질 농도를 저하시키는 효과도 인정되었다. Hesperetin은 실험적으로 유도한 간질환을 개선시켰다. 노화 및 질병의 발생과 깊이 관련된 것으로 알려진 불포화지방산 과산화 반응을 억제시키는 항산화 효과도 확인되었는데, hesperetin에서 좋은 효과를 나타내었다. 이상의 결과에서 감귤류 유래 플라보노이드는 동물의 혈중 콜레스테롤 및 중성지질 억제작용에 의한 혈관계 질환 개선효과, 지방간을 비롯한 간질환 개선효과, 암세포 증식억제 작용, 노화 및 질병의 원인이 되는 지질 과산화 억제 작용 등 건강에 관련된 다양한 생리기능 활성이 존재하는 것을 확인하여 기능성 성분의 연구로 일정의 효과를 얻었다. 따라서 이러한 감귤류 유래의 생리활성 성분의 연구목적은 건강증진 효과를 높이는 식품의 개발과 식품 첨가물의 신규 수요를 증대시켜 국민의 건강을 향상시키는데 있다.

• Journal of Microbiology and Biotechnology
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• 제13권6호
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• pp.998-1000
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• 2003

This study was carried out to elucidate the mode of bacteriostatic property of xanthostatin (XS), a novel depsipeptide antibiotic with an N-acetylglycine side chain and selective antimicrobial activity against Xanthomonas spp. Two biotransformed XSs were isolated by the treatment of XS with the cell lysate of Xanthomonas campestris pv. citri, a solvent partition, preparative TLC, and HPLC. Structure determination of those two biotransformed XSs demonstrated deletion of the N-acetylglycine side chain. Noteworthily, they showed no antimicrobial activity against Xanthomonas spp. This result suggests that the N-acetylglycine side chain plays a critical role in the antimicrobial activity of XS, and that the bacteriostatic property of XS is due to susceptibility of the ester bond between the hexadepsipeptide nucleus and the N-acetylglycine side chain to hydrolytic enzyme(s) produced by Xanthomonas spp.

• Preventive Nutrition and Food Science
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• 제11권3호
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• pp.198-203
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• 2006

The flowers of Chrysanthemum morifolium (Compositae) were investigated for their biofunctional components. Antioxidant compounds were identified from the flower of Chrysanthemum morifolium, through activity-guided fractionation and repeated column chromatographic separations. The structures of the isolated compounds were characterized as chlorogenic acid (1), luteolin (2) and quercitrin (3) by the analysis of physico-chemical and spectral data. Their antioxidant effects were evaluated by assaying for 1,1-diphenyl-2-picrylhydrazyl free radical scavenging activity and inhibition of xanthine/xanthine oxidase activity.

• 대한한의학회지
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• 제37권3호
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• pp.62-73
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• 2016

Objectives: Dropout and weight regain are common problems in most obesity treatments. The purpose of this study was to review previously published study results of the predictive factors associated with dropout during weight loss treatment and weight loss maintenance after successful weight loss. Methods: Authors searched for the articles related to dropout and weight loss maintenance, published from 2007 to 2016 found on Pubmed, Scopus, RISS, and KISS. A total of 19 articles were finally selected. From the study results, unchangeable and changeable predictors were extracted, and these predictors were examined according to dropout and weight loss maintenance categories. Results: The unchangeable predictors of dropout were younger age, lower education level and female, whereas the changeable predictors of dropout were lower initial weight loss, symptoms of depression and body dissatisfaction. The strongest factor for predicting the dropout was initial weight loss. The unchangeable predictors of weight loss maintenance were old age, male and family history of obesity, whereas the changeable predictors of weight loss maintenance were regular exercise, dietary restraint, self-weighing and low depressive symptoms. Initial weight loss, depressive symptoms, body image, dietary restraint, physical activity, weight loss expectation and social support were considered to be dominant factors for weight loss treatments. Conclusions: Our review results suggest that unchangeable and changeable predictors of dropout and weight loss maintenance should be carefully examined during treatments of obesity.

• 대한한의학방제학회지
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• 제28권1호
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• pp.71-80
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• 2020

Obejectives : The purpose of this study was to investigate the effects of Yijin-tang on pacemaker potentials of small intestinal interstitial Cells of Cajal (ICC). Methods : To dissociate the ICC, we used enzymatic digestions from the small intestine in mice. The electrophysiological whole-cell patch-clamp configuration was used to record pacemaker potentials in the cultured ICC and the in vivo effects of Yijin-tang on GI motility were investigated by calculating percent intestinal transit rates (ITR). Results : 1. The ICC generated pacemaker potentials in the murine small intestine. Yijin-tang produced membrane depolarization with concentration-dependent manners in the current clamp mode. 2. Pretreatment with a Ca²⁺ free solution and thapsigargin, a Ca²⁺-ATPase inhibitor in the endoplasmic reticulum, stopped the pacemaker potentials. In the case of Ca²⁺-free solutions and thapsigargin, Yijin-tang did not induce membrane potential depolarizations. 3. U73122, a phospholipase C (PLC) inhibitors, blocked the Yijin-tang-induced membrane potential depolarizations. However, U73343, an inactive PLC inhibitors, did not block. 4. In the presence of protein kinase C (PKC) inhibitors, staurosporine or Rottlerin, Yijin-tang depolarized the pacemaker potentials. However, in the presence of Go6976, Yijin-tang did not depolarize the pacemaker potentials. 5. In mice, intestinal transit rate (ITR) values were significantly and dose-dependently increased by the intragastric administration of Yijin-tang. Conclusions : These results suggest that Yijin-tang can modulate the pacemaker activity of ICC through an internal/external Ca²⁺ and PLC/PKC-dependent pathway in ICC. In addition, Yijin-tang is a good candidate for the development of a prokinetic agent.

• 한국약용작물학회지
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• 제15권6호
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• pp.391-397
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• 2007

새로운 고부가가치의 구기자 품종을 개발하기 위하여 구기자 표준 품종들과 이들의 교배종들의 순과 잎, 열매와 뿌리등의 물 추출물과 메탄올 추출물을 제조한 후 심혈관 질환 예방생리기능성과 노화억제 항산화 활성을 조사하여 비교하였다. 구기자 표준품종들의 생리기능성 가운데, 항산화 활성은 청운품종의 구기순의 메탄올 추출물이 93%로 가장 높았고 항고혈압성 안지오텐신 전환효소 저해활성은 청양7호의 지골피의 물 추출물에서 84.1%로 제일 높았다. 구기자 교배종의 생리 기능성중 항산화 활성은 명안A-2의 지골피의 메탄올 추출물이 93.1%로 제일 높았고 ACE저해활성은 DO148-72 (A11) 교배종 열매의 메탄올 추출물이 96.9%로 제일 높았다. 그러나 혈전용해활성과 HMG-CoA reductase 저해활성은 표준품종과 교배종 모두에서 대체로 미약하거나 없었다. 이상의 결과를 종합하였을 때 청운 표준품종의 구기순과 명안A-2 교배종의 지골피가 우수한 항산화 자원으로, DO148-72 (A11)교배종의 구기열매가 훌륭한 항고혈압성 ACE저해제 자원으로 각각 기능성 제품생산에 유용하게 활용될것으로 사료된다.

• 대한의생명과학회지
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• 제16권3호
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• pp.161-167
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• 2010

In this study, the biological activities of Glycyrrhiza uralensis were investigated, including antioxidative, fibrinolytic, thrombin inhibitory, and a-glucosidase inhibitory activity. The hot water extract of Glycyrrhiza uralensis was fractionated into hexane, $CHCl_3$, ethyl acetate, butanol, and water fractions, and each of these fractions were assayed individually. The water fraction showed the highest extraction yield of 19.45% (w/w). Using the DPPH method, the free radical scavenging activity was to be the strongest in the $CHCl_3$ fraction at 89.3%. Using the fibrin plate method, only the butanol fraction showed a substantial plasmin activity of 0.62 units/ml. In thrombin inhibitory activity tests, a 100-fold dilution of the ethyl acetate fraction showed the strongest activity of 46.9%. In the a-glucosidase inhibitory activity assay, a 100-fold dilution of the $CHCl_3$ fraction showed the strongest activity of 80.6%. In conclusion, the combined results of this study demonstrate that the extracts of Glycyrrhiza uralensis can be used as a material for the development of biofunctional foods for diabetics.

• 대한의생명과학회지
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• 제13권3호
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• pp.245-249
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• 2007

We investigated the fibrinolytic and ${\alpha}-glucosidase$ inhibitory activity of 55 wild mushroom methanol extracts. Among them, 14 mushrooms showed fibrinolytic activity. In particular, Amanita virgineoides showed the greatest enzyme activity (3.9 plasmin units/ml) by a fibrin plate assay. The fibrinolytic activities of Suillus pictus and Polypolellus varius were 3.8 plasmin units, and the activity of Gomphus fujisanensis was 2.8 plasmin units. Leccinum extremiorientale and Xerocomus nigromaculatus had the same activity with 2.3 plasmin units. In a ${\alpha}-glucosidase$ inhibitory activity test, Lactarius sp. showed the greatest inhibitory activity at 97.3%. The ${\alpha}-glucosidase$ inhibitory activities of Clitocybe odora, Xerocomus nigromaculatus, Melanoleuca melaleuca, Suillus pictus, and Gyroporus castaneus were 84.3%, 77.9%, 74.6%, 68.7%, and 65.4%, respectively. According to the results, because Suillus pictus and Xerocomus nigromaculatus have strong fibrinolytic and ${\alpha}-glucosidase$ inhibitory activities, the two mushrooms will be used as materials for the development of new biofunctional food.