• Archives of Pharmacal Research
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• v.28 no.12
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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 $ONOO^{-}$.

• The Korean Journal of Mycology
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• v.49 no.4
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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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• v.7 no.1
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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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• v.4 no.2
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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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• v.65 no.3
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• pp.221-230
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• 2022

We investigated the antioxidant and anti-inflammatory effects of silymarin. The antioxidant activity was evaluated using 1,1-diphenyl-1-picrylhydrazyl radical (DPPH) and 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) radicals scavenging assays. Silymarin scavenged 71% of DPPH radicals and 78% of ABTS radicals at a concentration of 1 mg/mL, respectively. Silymarin effectively inhibited the oxidative damage of DNA, and the oxidative modifications of human serum proteins and Cu,Zn-SOD. Also silymarin effectively inhibited H₂O₂- and LPS-induced cell death as well as the generation of reactive oxygen species and DNA fragmentation by H₂O₂ and LPS. The results suggested that silymarin might be an effective natural antioxidant and anti-inflammatory material.

• Proceedings of the PSK Conference
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• 2002.10a
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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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• v.37 no.4
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• pp.310-314
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• 1994

An antioxidant was isolated from pine needles. This compound was identified as 4-hydroxy-5-methyl-3[2H]-furanone on the basis of spectroscopic evidences and by the comparison with the synthetic one from the Maillard reaction of xylose and glycine. It scavenged 1,1-diphenyl-2-picrylhydrazyl free radicals more efficiently than 4-hydroxy-2,5-dimethyl-3[2H]-furanone and $3-hydroxy-2-methyl-{\gamma}-pyrone$ did. It exhibited inhibitory effects on the autoxidation of 3,4-dihydroxyphenylalanine and linolenic acid.

• Archives of Pharmacal Research
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• v.27 no.6
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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.

• Herbal Formula Science
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• v.10 no.2
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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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• v.22 no.3
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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.