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냉이(Capsella bursa-pastoris) 에탄올 추출물의 유리라디칼 소거 및 항산화 활성
홍정일,나경수,양한철 한국식품영양학회 1994 韓國食品營養學會誌 Vol.7 No.3
천연 식품재료를 대상으로 superoxide dismutase 활성 측정법을 이용 superoxide radical 소거능에 대하여 검색하였다. 총 47종의 시료중 냉이 buffer 추출물이 11.6 unit/㎎ solid의 비교적 높은 활성을 나타내었으므로 이후 실험이 대상시료로 선정하였다. 냉이의 최적 추출용매를 선정하기 위하여 각종 용매로 추출한 후 수소공여능 및 linoleic acid에 대한 과산화지질 형성 억제능을 조사한 결과 에탄올 추출물에서 가장 높은 활성을 보였다. 냉이 에탄올 추출물은 50℃에서의 대두유 자동산화에 대해 항산화 활성을 나타내었으며, 에탄올 추출물 0.2% 첨가시 대조구에 비해 유도기간이 약 2배 증가하는 효과를 나타내었다. Screening was performed on edible natural sources to examine superoxide radical scavenging activities by using the method of superoxide dismutase assay. Among 47 kinds of samples, the extract of Capsella bursa-pastoris showed a potent superoxide radical scavenging activity of 11.6 unit/㎎ solid and was selected for further studies. In order to select optimal extraction solvent system, Capsella bursa-pastoris was extracted with various solvents and the electron donating abilities and inhibitory effects on lipid peroxidation of linoleic acid were measured. Among them, the ethanol extract of Capsella bursa-pastoris possessed the highest level of activities. The ethanol extract of Capsella bursa-pastoris was found to have an inhibitory effet on autoxidation of soybean oil at 50℃ from peroxide value, conjugated diene value and refractive index. In the soybean oil containing 0.2% of ethanol extract, induction period was increased 2 times in comparison with control.
다양한 페놀성 물질과 Folin-Ciocalteu 시약의 반응성에 미치는 영향 요인 평가
홍정일(Jungil Hong),김현정(Hyun Jung Kim),김지윤(Ji Yun Kim) 한국식품영양과학회 2011 한국식품영양과학회지 Vol.40 No.2
본 연구에서는 F-C시약을 이용한 페놀성 물질의 정량방법에서 다양한 종류의 페놀성 성분들의 반응특성 및 반응영향요인들을 분석하였다. 정량방법 중 Na₂CO₃를 선처리는 F-C시약을 먼저 처리하는 방법에 비해 대부분 페놀성 물질들의 발색반응도 감소를 야기하였으며, 특히 -OH 밀도가 높은 galloyl group을 가진 gallic acid 및 EGCG 등의 성분이 두드러진 감소를 나타내었다. F-C시약과 Na₂CO₃를 동시에 처리하는 경우 F-C시약을 선처리 하는 경우에 비해 각 페놀성 물질의 반응성이 약간 감소되는 경향을 나타내었다. 그 원인은 페놀성 물질들이 산성인 F-C시약에서보다 Na₂CO₃ 용액의 알칼리 환경에서 화학적으로 불안정하기 때문이며, pH 7.4 및 9의 환경에서 페놀성 물질로부터 생성된 산화물들은 F-C시약과의 반응성이 약화됨을 확인하였다. 이 과정중에 같이 형성된 H₂O₂는 F-C와의 반응에 직접적인 영향을 미치지 않았다. FeA와 SiA와 같은 monophenol류는 방법의 차이에 따라 큰 반응성의 변화를 나타내지 않았으며, 발색도는 느리지만 꾸준히 증가하는 kinetics 패턴을 보였다. 실제시료에의 적용을 위해 연잎 추출물을 제조하고 각 정량방법에 대한 반응도 차이를 조사한 결과, 역시 Na₂CO₃ 처리환경에서 현저한 발색반응도 저하를 나타내었다. 보다 정확한 페놀성 물질의 정량을 위해 적절한 표준물질의 선택 및 정량방법 등에 대한 표준화가 필요할 것으로 사료된다. The Folin-Ciocalteu (F-C) reagent has been extensively used for quantifying total phenolic contents in many different types of food materials. Since several different procedures of the assay methods using the F-C reagent have been applied, we investigated changes in reactivity of various phenolic compounds with the F-C reagent under three different assay conditions and factors affecting reactivity. Among 10 standard compounds tested, compounds with high hydroxyl density (number of -OH/molecular weight) showed a largely different response according to addition sequence of the F-C reagent or Na₂CO₃. Preincubation in Na₂CO₃ significantly reduced the reactivity of the phenolic compounds bearing galloyl moiety (e.g. gallic acid, tannic acid, and epigallocatechin-3-gallate) with the F-C reagent, while monophenol compounds including ferulic acid and sinapinic acid were more stable as compared to diphenols. There was little change in response to the F-C reagent of all phenolic compounds incubated in acidic pH; their reactivity except ferulic acid was reduced significantly when incubated in neutral or alkaline pH. Changes in reactivity of gallic acid incubated in Na₂CO₃ or neutral/alkaline pH conditions were the most prominent. H₂O₂ generated from phenolic compounds did not affect the reaction with the F-C reagents. The present results suggest that reactivity of different phenolic compounds with F-C reagent was affected considerably by different procedures of the assay, and the total phenolic contents could be fluctuated according to standard compounds and assay scheme.
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%.
프로톤 펌프 억제제 종류에 따른 비궤양성 소화불량증 환자와 소화성 궤양 환자의 Helicobacter pylori 제균율 비교
홍은정 ( Eun Jung Hong ),박동일 ( Dong Il Park ),오석중 ( Suk Joong Oh ),송민준 ( Min Jun Song ),최우혁 ( Woo Hyuk Choi ),홍철호 ( Cheul Ho Hong ),박정호 ( Jung Ho Park ),김홍주 ( Hong Joo Kim ),조용균 ( Yong Kyun Cho ),손정일 ( C 대한소화기학회 2008 대한소화기학회지 Vol.52 No.2
Background/Aims: Conflicting results have been reported whether patients with non-ulcer dyspepsia (NUD) respond differently to Helicobacter pylori (H. pylori) eradication treatment compared with patients with peptic ulcer diseases (PUD). The aim of this study was to evaluate any difference in H. pylori eradication rates between patients with NUD and PUD according to each proton pump inhibitor (PPI). Methods: From September, 2004 to April, 2007, we retrospectively reviewed 2,297 patients with NUD (1,050 patients) or PUD (1,247 patients) infected with H. pylori. All patients received a standard 1 week triple therapy comprising of one of the five PPIs (pantoprazole, esomeprazole, omeprazole, lansoprazole, rabeprazole), clarithromycin and amoxicillin. The follow-up H. pylori test was performed 4 weeks after the completion of therapy. Results: There was no significant difference in the eradication rates between the two groups. In comparison of eradication rates according to PPI, omeprazolebased triple therapy group showed higher eradication rate than other groups in patients with NUD, but not in patients with PUD. Conclusions: This study failed to show any difference in H. pylori eradication rate between patients with NUD and PUD. There is no convincing evidence that the eradication rate may be affected by different PPI. (Korean J Gastroenterol 2008;52:80-85)