http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
오늘 본 자료
박기의,김연계,임치원,서영완,장미순,박희연 한국응용생명화학회 2005 Journal of Applied Biological Chemistry (J. Appl. Vol.48 No.4
Antioxidant activity of the ethanol extract from boiled-water of Hizikia fusiformis (EBH) were compared with those of BHA, L-ascorbic acid, gallic acid, caffeic acid and (-)-catechin. The free radical scavenging ability against DPPH (1,1-diphenyl-2-picrylhydrazyl), authentic peroxynitrite and reducing power were measured as indices of antioxidant activity. EBH showed the potent DPPH radical and peroxynitrite scavenging activities, showing 85.23 and 96.97% at final concentration of 1000 µg/ml, respectively. The reducing power increased with the increasing amount of EBH (final concentration of 1, 10, 100 and 1000 µg/ml). Total phenolic content of EBH was 588 mg (-)-catechin/g at the final concentration 1000 µg/ml. Total phenolic contents correlated with DPPH radical scavenging activity (R2= 0.766) and reducing power (R2= 0.944). These results suggested that EBH could be a natural antioxidative source containing antioxidative components.
갈조류 지충으로부터 분리한 3개의 Norisoprenoids 화합물
박기의,김유아,정현아,이희정,안종웅,이범종,서영완,Park, Ki-Eui,Kim, You-Ah,Jung, Hyun-Ah,Lee, Hee-Jung,Ahn, Jong-Woong,Lee, Burm-Jong,Seo, Young-Wan 대한화학회 2004 대한화학회지 Vol.48 No.4
우리나라 연안에 널리 분포하고 있는 지충이로부터 3개의 norisoprenoid 화합물들인 (+)-epiloliolide (1), (-)-loliolide (2), apo-9''-fucoxanthinone (3)을 칼럼크로마토그래피와 역상 HPLC를 사용하여 분리$\cdot$정제하였다. 이들 분리한 화합물 1, 2 및 3은 갈조류인 지충이로부터 처음 분리되어 보고하는 것이다. 특히 화합물 1은 비록 육상식물에서 분리된 바 있으나, 해양생물로부터는 처음 분리되어 보고하는 것이다. 분리된 화합물의 구조는 $1^H$ COSY, NOESY, HMQC 그리고 HMBC와 같은 이차원적인 NMR 분광학적인 실험을 이용하여 문헌치와 비교하여 확인하였다. From Sargassum thunbergii which is widely distributed in coastal area of Korea, three norisoprenoids, (+)-epiloliolide (1), (-)-loliolide (2), and apo-9'-fucoxanthinone (3) were isolated by using column chromatography and reverse-phase HPLC. Compound 1, 2 and 3 were for the first time isolated from the Brown Alga Sargassum thunbergii. Particularly, Compound 1 was for the first time isolated the marine organism although it was reported from the terrestrial plant. Their structures have been determined by extensive 2-D NMR experiments such as $^1H COSY, NOESY, HMQC$, and HMBC and by comparison with the reported data in the literature.
과산화아질산염과 DPPH 라디칼에 대한 해조 추출물의 소거 활성 효과
이희정,안종웅,이범종,서영완,박기의,유종수 한국해양과학기술원 2004 Ocean and Polar Research Vol.26 No.1
As a part of our search for novel antioxidants from the seaweeds, we have investigated radical scavenging effect for their crude extracts using 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical, authentic peroxynitrite, and 3-morpholinsydnonimine (SIN-1), a peroxynitrite-generating species in vitro. Thirty-four seaweeds were screened for ONOO- and DPPH radical scavenging activities. A potent inhibitory effect against peroxynitrite generated by SIN-1 at 5 mg/ml of methanol extracts was observed in order of Ishige okamurae (95.3%), Sargassum hemiphyllum (90.2%), Symphyocladia latiuscula (89.6%), Porphyra suborbiculata (86.7%), and Gelidium amansii (85.9%). Also, a significant scavenging effect against direct authentic peroxynitrite was revealed for methanol extracts of Ishige okamurae (66.2%) and Sargassum hemiphyllum (55.2%) and the acetone/methylene chloride (1:1) extract of Gigatina tenella (61.0%). In our measurement for evaluating the capacity to scavenge the stable free radical of DPPH, acetone/methylene chloride (1:1) extracts of Symphyocladia latiuscula, Gloiopeltis furcata, and Sargassum thunbergii and the methanol extract of Sargassum sp. showed an inhibitory potency of 85.8%, 82.8%, 74.1%, and 64.0%, respectively.
서영완,이희정,차효준,김유아,박기의 韓國海洋大學校 附設 海洋科學技術硏究所 2002 硏究論文集 Vol.11 No.2
The antioxidant activity of methanol and dichloromethane extracts of salt marsh plants was tested by using 1,1-Diphenyl-2-picryl-hydrazyl(DPPH). Three salt marsh plants (Erigeron annuus, Ixeris tamagawaensis kitamura, Portulaca oleracea) were found to be significantly effective in DPPH radical scavenging activity. The combined crude extracts of Portulaca oleracea were sequentially partitioned with n-hexane, 15% aq. MeOH, EtOAc, n-BuOH and H_2O. the antioxidative activities of several fractions were determined by evaluation the DPPH radical scavenging effect and by measuring lipid peroxide using 2-thiobarbituric acid (TBA). Among them, remarkable antioxidative effects were observed in the fractions of EtOAc and n-BuOH. The DPPH radical scavenging effect (IC_50=17.90㎍/ml) of the n-BuOH soluble fraction was comparable with that of natural antioxidant, a-tocopherol (IC_50=6.99㎍/ml).