• 생약학회지
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• 제32권3호통권126호
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• pp.253-256
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• 2001

The present study was designed for the improvement of routine measurement of superoxide and hydroxyl radical scavenging activities utilized by a microplate reader. Superoxide radical scavenging activity by the ascorbic acid, which is a well-known superoxide scavenger, was determined in a dose-dependent manner. Hydroxyl radical scavenging activity by the thiourea, which is a well-known hydroxyl radical scavenger, was also well detected in a dose-dependent manner. Our results suggest that the use of microplate reader to assay the superoxide and hydroxyl radical scavenging activities improves the accuracy of data and enables the use of much smaller amounts of samples and/or reagents, with much simpler experimental procedure. Therefore, These methods appear to be suitable for screening of superoxide and hydroxyl radical scavenging activities in both the plant medicinal extracts and the isolated compounds.

• KSBB Journal
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• 제32권2호
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• pp.140-145
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• 2017

The objective of this study was to compare antioxidant effects of different extracts of Salicornia bigelovii seed. DPPH radical scavenging activity, chelating activity of ferrous, superoxide anion radical-scavenging activity, hydroxyl radical scavenging activity, and contents of total polyphenol and flavonoid were measured for different extracts. Ethanol extract (10 mg/mL) was found to have the maximum DPPH radical scavenging and superoxide anion radical scavenging activities (65.26 and 62.36%, respectively). However, hot water extract (10 mg/mL) showed the highest hydroxyl radical scavenging and chelating activities (51.50 and 53.24%, respectively). Total phenolics and flavonoid contents in the ethanol extract were 522.8 and $480.35{\mu}g/mg$, respectively. They were 401.51 and $352.60{\mu}g/mg$, respectively, in the hot water extract. These results indicate that ethanol and hot water extracts of S. bigelovii seed have good potential to be used as a new source of antioxidants for functional foods, cosmetics, and pharmaceuticals.

• 한국식품저장유통학회지
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• 제9권2호
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• pp.253-259
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• 2002

민들레 잎과 뿌리로부터 물추출물을 제조하여 항산화 활성 및 라디칼 소거활성을 분석하기 위하여 linoleic acid에 대한 과산화물 생성저해율, DPPH radical에 대한 소거활성, chemiluminescence를 이용한 hydroxyl radical에 대한 소거활성, EPR을 이용한 superoxide anion radical에 대한 소거활성및 hydrogen peroxide에 대한 소거활성을 측정하였다. 그 결과, 민들레 잎의 물추출물이 뿌리의 물추출물 보다 지방산에 대한 과산화물 생성 저해율이 높았고, DPPH radical, hydroxyl radical, superoxide anion radical 및 hydrogen peroxide에 대한 소거활성 역시 매우 높은 것으로 나타났다.

• 한국식품과학회지
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• 제51권2호
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• pp.133-140
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• 2019

Antioxidant activities of Ulmus davidiana root and bark extracts were evaluated by various antioxidant tests, including DPPH radical-scavenging, nitric oxide-scavenging, superoxide anion radical-scavenging, and ABTS radical-scavenging assays, and superoxide dismutase (SOD)-like activity and reducing power analysis, along with the determination of total phenolic and flavonoid contents. Both the extracts showed strong antioxidant activities by these testing methods. Ulmus davidiana root extract possessed strong reducing power and nitric oxide-scavenging activity, and high scavenging activities against free radicals including the superoxide anion, and the ABTS and DPPH radicals, but a weaker scavenging activity of SOD. In contrast, the Ulmus davidiana bark extract exhibited a strong SOD-like activity, but all the other activities were weak. It was observed that the total phenolic and flavonoid contents of the Ulmus davidiana root extract were higher than those of the Ulmus davidiana bark extract.

• 한국응용과학기술학회지
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• 제34권3호
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• pp.673-682
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• 2017

식물 및 동물성 단백질 유래 펩타이드 형태의 단백질 가수 분해물들은 항산화, 고혈압 완화, 면역조절, 진통완화 및 항균작용 등 생리활성이 있는 것으로 알려져 왔다. 본 연구는 연산오계란 단백질 가수 분해물을 Ultrafiltration를 이용하여 HDS(분획되지 않은 가수 분해물), 1 kDa, 5 kDa, 10 kDa, 50 kDa로 분획된 기능성 펩타이드의 DPPH radical scavenging activity, superoxide anion radical scavenging activity, hydroxyl radical scavenging activity 및 $Fe^{2+}$ chelation ability을 평가하였다. 그 결과 DPPH radical scavenging activity 최대값은 1 kDa(70.83 %), hydroxyl radical scavenging activity 최대값은 5 kDa (47.01 %), superoxide anion radical scavenging activity 최대값은 5 kDa(40.57 %), $Fe^{2+}$ chelation ability 최대값은 5 kDa(29.87 %)로 나타났다. Ultrafiltration를 이용하여 fractionation된 단백질 가수 분해물의 항산화 저해 능력 $IC_{50}$ 평가하였다. 그 결과 HDS의 최대값은 superoxide anion radical scavenging activity($IC_{50}$, 5.42 mg/ml)이고, 1 kDa의 최대값은 $Fe^{2+}$ chelation ability($IC_{50}$, 1.67 mg/ml)이고, 5 kDa의 최대값은 $Fe^{2+}$ chelation ability($IC_{50}$, 2.09 mg/ml)이고, 10 kDa의 최대값은 $Fe^{2+}$ chelation ability($IC_{50}$, 2.61 mg/ml)이고, 50 kDa의 최대값은 $Fe^{2+}$ chelation ability($IC_{50}$, 4.53 mg/ml)이다. 그러므로 본 연구 결과를 바탕으로 5 kDa를 이용하여 오계란 단백질에서 분획한 펩타이드는 항산화 기능성 식품소재로서 활용할 가치가 높을 것으로 기대한다.

• Natural Product Sciences
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• 제13권1호
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• pp.40-45
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• 2007

The methanol extract of Coscinium fenestratum, commonly own as tree turmeric, which is widely used in the indigenous system of medicine was studied for its in vitro scavenging activity in different methods viz DPPH scavenging, nitric oxide scavenging, iron chelation activity, superoxide scavenging, ABTS radical scavenging and lipid peroxidation. The results were analyzed statistically by regression method. Its antioxidant activity was estimated by $IC_{50}$ value and the values are $57.1\;{\mu}g/ml$ for DPPH radical scavenging, $36.5\;{\mu}g/ml$ for iron chelating activity, $51.7\;{\mu}g/ml$ for nitric oxide scavenging, $53.63\;{\mu}g/ml$ for ABTS scavenging, $44.2\;{\mu}g/ml$ for superoxide scavenging, and $40\;{\mu}g/ml$ for lipid peroxidation. In all the methods, the extract showed its ability to scavenge free radicals in a concentration dependent manner. The results indicate that C. fenestratum has potent antiofidant activity.

• Mycobiology
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• 제34권3호
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• pp.124-127
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• 2006

This study was aimed at evaluating the antioxidant activities of methanol extract of Thamnolia vermicularis. The antioxidant activity, reducing power, superoxide anion radical scavenging and free radical scavenging activities were studied. The antioxidant activity of the extract correlated with its concentration ($0.2{\sim}2\;mg/ml$) in the reaction mixtures containing linoleic acid. Upto 67% of lipid peroxidation was inhibited by 2 mg/ml of the lichen extract. The extract showed strong free radical scavenging activity similar to that of BRA (positive control) in a manlier of concentration dependent. The lichen extract also showed moderate effects on superoxide anoin scavenging activity and reducing power, which was not so effective as that of Quercetin and BHA used as positive controls. This study suggests that T. vermicularis lichen can be used as a novel source of natural antioxidant.

• Preventive Nutrition and Food Science
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• 제15권1호
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• pp.51-56
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• 2010

The aim of this study is to examine the radical scavenging activity of perilla and sesame oil that Koreans traditionally consume. For DPPH radical scavenging activity, oil and its hexane/70% methanol extracts (ME) are used and for superoxide and hydroxyl radical scavenging activities, ME are used. Unrefined perilla oil, sesame oil, and refined sunflower oil are used. The yields for ME of perilla, sesame and sunflower oil are 0.57, 0.61, and 0.30%, respectively, and the amounts of phenolic compounds in ME of corresponding oil are 18.77, 88.64 and $0.05\;{\mu}g$ tannic acid/mg, respectively. $IC_{50}$ for DPPH scavenging activity of perilla, sesame and sunflower oil are 2.12, 1.91, and 3.35 mg/mL, respectively and those for ME of corresponding oils are 0.42, 0.07, and 43.11 mg/mL, respectively. In DPPH assay, the solvent used for oil sample is iso-octane and that for ME is methanol. Superoxide anion scavenging activity of ME of perilla, sesame and sunflower oil tested at 1 mg/mL concentration are 21.10, 13.25, and 3.14%, respectively. Hydroxyl radical scavenging activities of those samples tested at 1 mg/mL concentration are 86.08, 93.30, and 93.17%, respectively. In summary, the refining process seems to remove the phenolic compound during oil processing. Antiradical substances in perilla and sesame oils responsible for scavenging DPPH radicals are present in the methanol fraction, while the antiradical substances in the sunflower oil are in the lipid fraction. DPPH scavenging activity of ME of sesame oil is significantly higher than that of perilla oil (p<0.05). However, superoxide anion scavenging capacity of ME of perilla oils was found to be greater than that of both sesame and sunflower oils (p<0.05).

• Applied Biological Chemistry
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• 제46권1호
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• pp.32-38
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• 2003

시판되고 있는 두류 13종류의 70% 에탄을 추출물을 제조하여, 이들의 항산화 활성을 환원력, 지질과산화 억제 활성, superoxide radical 소저활성, hydroxyl radical 소거활성, mitomycin C로 유도된 DNA의 산화적 손상에 대한 억제활성을 지표로 조사하였다. 환원력은 예팥, 속피리, 유월콩 및 적두가 높았다. 지질과산화 억제능을 조사한 결과, linoleic acid 자동산화계를 이용한 실험계에서 모든 시료가 억제활성을 보인 반면, 토끼 적혈구막 지질과 산화에 대한 억제활성은 쥐눈이콩과 적두, 속피리에서만 관찰되었다. Superoxide radical 소거활성은 예팥, 나물콩, 적두, 쥐눈이콩에서 높게 나타났으며, hydroxyl radical 소거활성은 속피리, 청태, 예팥과 제비콩에서 높았다. Mitomycin C로 유도된 DNA의 산화적 손상에 대한 억제활성을 조사한 결과, 모든 품종들이 DNA의 산화적 손상을 억제할 수 있었으나, 특히 예팥, 쥐눈이콩, 나물콩, 녹두, 적두의 억제활성이 우수하였다. 이상의 실험결과에서 예팥, 적두, 쥐눈이콩, 속피리가 환원력, 지질과산화 억제, superoxide radical 및 hydroxyl radical 소거활성, DNA의 산화적 손상에 대한 억제활성 둥 항산화활성이 우수한 품종임을 알 수 있었다.

• 동의생리병리학회지
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• 제21권5호
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• pp.1135-1141
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• 2007

In recent year, We are concerned in anti-aging, disease-protection, long-life, many method are used in solving this problem. Recently, We heard that Luffae Fructus Retinervus(LFR) has effect of anti-aging, disease-protection, long-life. So I let made a experiment for this result. The purpose of this study is to; 1) the anti-oxidant effect of Luffae Fructus Retinervus(LFR) used for 3 methods, those are DPPH radical scavenging activity, Nitric oxide(NO) radical scavenging activity, Superoxide anion radical scavenging activity, 2) cultivation 3T3-L 1 Preadipocytes and Protein chip used for ProteoPlexTM 16-Well Murine Cytokine Array Kit. We measured level of DPPH radical scavenging activity. And we experienced that the ability of DPPH radical's elimination was increased by rising concentration of LFR. When the concentration of LFR was 5 mg/ml, the ability of DPPH radical's elimination was Maximum. We measured level of Nitric oxide(NO) radical scavenging activity. And we founded that the ability of NO radical's elimination was significant when concentration of LFR was from 1.25 mg/ml to 2.5 mg/ml. We measured level of Superoxide anion radical scavenging activity. And we founded that the ability of Superoxide anion radical's elimination was maximum when concentration of LFR was 0.3125 mg. When we inspected Antioxidative Effects with BSA, we experienced that ability of defense was increased by rising concentration of LFR. We known the immunity of LFR about 3T3-L1 Preadipocytes and gained the increase of Cytokines(IL-2, IL-4, GM-CSF) without IL-12p70, $INF-{\gamma}$, $TNF-{\alpha}$ So I guess that Luffae Fructus Retinervus(LFR) has effects of anti-aging, disease-protection, long-life, etc.