• Archives of Pharmacal Research
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• 제28권12호
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• pp.1333-1336
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• 2005

A new lavandulylated flavonoid, 8-lavandulylkaempferol (1), was isolated from the roots of Sophora f1avescens AITON (Leguminosae). The structure of this compound was determined via spectroscopic analysis. Compound 1 was determined to be a scavenger on both 1, 1-diphenyl­2-picrylhydrazyl radicals and $ONOO^{-}$.

• 한국균학회지
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• 제49권4호
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• pp.433-440
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• 2021

The fungal genus Trametes is globally distributed and comprises various wood-decay species, including the well-known medicinal mushroom Trametes versicolor, a popular remedy in traditional Asian medicine. Trametes species produce antioxidants, which have a wide range of health benefits. The pressent study evaluated seven indigenous Trametes species from Korea, which were cultivated in three different media (dextrose-yeast extract, DY; malt extract-yeast extract, MY; malt extract broth, MEB) and tested for antioxidant activity using the 2,2-diphenyl-1-picrylhydrazyl and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) assays. We found that the medium consumption rate did not significantly differ between the media and among the strains (72-76%). However, the T. versicolor strains had a relatively low consumption rate (14-65%). The 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) tests demonstrated that culture filtrates of T. cf. junipericola, T. orientalis, T. suaveolens, and T. versicolor possessed antioxidant activity against damage from free radicals. In particular, T. cf. junipericola (DY) and T. versicolor (MY) had >80% activity in the DPPH and ABTS assays, compared with that of the positive control (ascorbic acid). Thus, our study identified promising candidates with substantial antioxidant activity among the indigenous strains of Trametes spp. from Korea.

• Natural Product Sciences
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• 제7권1호
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• pp.1-4
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• 2001

The antioxidant activity of Pinus densiflora was determined by measuring the radical scavenging effect on 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals. The methanol extract of P. densiflora showed strong antioxidant activity, and thus fractionated with several solvents. The antioxidant activity potential of the individual fraction was in the order of ethyl acetate>n-butanol>water>dichloromethane> n-hexane fraction. The ethyl acetate soluble fraction exhibiting strong antioxidant activity was further purified by repeated silica gel column chromatography. Antioxidant (+)-catechin was isolated as one of the active principles from the ethyl acetate fraction, together with the inactive components, dihydrokaempferol and 1-O-benzoylglucose. The radical scavenging effect of (+)-catechin on DPPH radical exceeded to that of L-ascorbic acid which is a well known antioxidant.

• Preventive Nutrition and Food Science
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• 제4권2호
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• pp.92-96
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• 1999

The effects of aqueous extracts from Korean commercial teas on excessive free radicals were examined utilizing spin trapping, 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radical and lipid peroxidation. A potent scavenging effect of green tea and oriental senna tea was dound using sipin trapping. The most effective teasagainst the DPPH radical was green tea, followed inorder by pine leak tea, Chinese gutta percha tea and orietnal senna tea. Similar to the effects of DPPH radical , green tea, pine leaf tea, Chinese gutta percha tea and oriential senna tea had an inhibitory effect on lipid peroxidation. These findings predict that Korean tea is a promising material for scavenging free radicals, and for curing diseases related to free-radical reactions.

• Journal of Applied Biological Chemistry
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• 제65권3호
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• pp.221-230
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• 2022

본 연구는 실리마린의 항산화 및 항염증 활성을 알아보고자 하였다. 항산화 활성은 2,2-diphenyl-1-picrylhydrazyl (DPPH)와 2,2'-azino-bis (3-ethylbenzothiazoline5 6-sulfonic acid) (ABTS) 라디칼에 대한 소거능을 측정하여 확인하였다. 실리마린은 1 mg/mL의 농도에서 DPPH 라디칼을 71%, ABTS 라디칼을 78% 소거하여 우수한 항산화 효과를 나타냈다. 실리마린은 DNA의 산화적 손상을 효과적으로 억제하였고 사람 혈청 단백질과 Cu,Zn-SOD의 산화적 변형을 억제하였다. 또한 실리마린은 H₂O₂와 LPS에 의한 세포사멸, ROS 생성 및 DNA fragmentation을 억제하였다. 본 연구 결과들을 통해 실리마린은 효과적인 천연 항산화 및 항염증 소재로 적용될 수 있음을 제시하였다.

• 대한약학회:학술대회논문집
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• 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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• pp.376.1-376.1
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• 2002

Phytochemical examination of Barks of Ulmus macrocarpa isolated two flavanone, three flavanonol, three flavan 3-ol and one procyanidin compounds. We also determinated the antioxidative activity of these compounds by measuring the radical scavenging effect on 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radicals. Three flavan 3-ol (catechin, epicatechin and catechin-7-O-$\beta$-O-xylopyranoside) and procyanidin B1 showed significant antioxidative activity. (omitted)

• Applied Biological Chemistry
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• 제37권4호
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• pp.310-314
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• 1994

솔잎으로부터 프리 라디칼 소거 작용이 있는 물질을 분리하고, 여러 기기 분석 결과에 근거하여 4-hydroxy-5-methyl-3[2H]-furanone으로 동정하였다. 아울러 xylose와 glycine의 Maillard 반응을 통하여 이 물질을 합성하였다. 이 물질은 1,1-diphenyl-2-picrylhydrazyl(DPPH) 프리 라디칼에 대해 소거 작용을 보였으며(100 M의 DPPH의 50%를 환원 시키는데 필요한 농도, 즉 $SC_{50}=26\;{\mu}M$) 이는 구조적으로 유사한 공지의 항산화 물질인 $4-hydroxy-2,5-dimethyl-3[2H]-furanone(SC_{50}=53\;{\mu}M)$과 $3-hydroxy-2-methyl-{\gamma}-pyrone(SC_{50}=4.0\;mM)$에 비해 강력한 것이다. 4-Hydroxy-5-methyl-3[2H]-furanone은 3,4-dihydroxyphenylalanine과 linolenic acid의 자동 산화에 대해서 억제 작용을 나타내었다.

• Archives of Pharmacal Research
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• 제27권6호
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• pp.593-599
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• 2004

From the EtOAc fraction of the MeOH extract of Albizzia julibrissin (Leguminosae）, a rare 5-deoxyflavone (geraldone, 1）, isookanin (2）, luteolin (3）, an isoflavone (daidzein, 4）, five prenylated flavonoids ［soph6f1avescenol (5）, kurarinone (6）, kurarinol (7）, kuraridin (8） and kuraridinol (9）］, a cerebroside (soya-cerebroside I, 10）, and $(-)-syringaresinol-4-O-{\beta}-D-glucopyranoside$ (11） were isolated and characterized on the basis of spectral data. Compounds 2, 3, and 11, showed 1, 1-diphenyl-2-picrylhydrazyl radical scavenging activity.

• 대한한의학방제학회지
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• 제10권2호
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• pp.243-249
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• 2002

This study was performed to investigate the effects of fermented extract of Pinus densiflora (FPD) on oxygen radicals and $H_2O_2$-induced damage. The results are as follows: 1. The 1.1-diphenyl-2-picrylhydrazyl (DPPH) free radicals were considerably reduced by FPD and $IC_{50}$ value was showed the concentration of 20 ㎍／㎖. 2. The cytotoxicity did not observe by FPD treatment in A548 cells. 3. The $H_2O_2$-induced cell damage was recovered by FPD pretreatment in A549 cells. These results suggest that FPD, as a natural antioxidant, has scavenging effect of free radicals and protection effect from $H_2O_2$-induced cytotoxicity.

• Preventive Nutrition and Food Science
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• 제22권3호
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• pp.223-230
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• 2017

The purposes of this study were to produce polysaccharides from red pepper stems using different extraction methods and evaluate their chemical composition, in vitro biological capacities, and rheological properties. Two polysaccharides were extracted from red pepper stems using an autoclave and alkali treatments, and the extracts were named PAU and PAL, respectively. The contents of total phenolics and flavonoids were significantly higher in PAU than those in PAL. PAU exhibited greater scavenging activities on 2,2-diphenyl-1-picrylhydrazyl radicals, 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt radicals, superoxide radicals, and nitrite compared to PAL, suggesting that PAU served as better antioxidants. Similarly, in vitro inhibitory abilities against carbohydrate hydrolyzing enzymes of PAU were higher than those of PAL. Steady shear rheological analysis demonstrated that PAU showed higher psuedoplastic shear-thinning behavior compared to PAL. Based on the results from dynamic shear rheological properties, it was found that both samples had predominantly viscous behavior rather than elastic behavior.