• Food Science and Biotechnology
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• 제15권2호
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• pp.312-316
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• 2006

Crude extract of young dangyuja (Citrus grandis Osbeck) fruit was investigated for its antioxidant activity as measured by 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging activity. Among the samples, including 4 Citrus species and various solvent-extracted-fractions of young dangyuja fruit, the water-extracted fraction (WF) and butanol-extracted fraction (BF) showed the greatest DPPH free radical scavenging activity. WF and BF were further examined for their antioxidant activities by three different in vitro assays. The cell viability tests using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) reduction assay showed that both fractions significantly reduced $H_2O_2$-induced cytotoxicity in HepG2 cells dose-dependently. Generation of the reactive oxygen species (ROS) was also reduced in cells pretreated with both fractions. In addition, BF showed a higher level of lipid peroxidation inhibitory capacity than WF in $H_2O_2$-treated HepG2 cells. Taken together, these results indicate that young dangyuja fruit can be used as an easily accessible source of natural antioxidants.

• Molecules and Cells
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• 제39권1호
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• pp.31-39
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• 2016

The peroxiredoxins (Prxs) constitute a very large and highly conserved family of thiol-based peroxidases that has been discovered only very recently. We consider here these enzymes through the angle of their discovery, and of some features of their molecular and physiological functions, focusing on complex phenotypes of the gene mutations of the 2-Cys Prxs subtype in yeast. As scavengers of the low levels of $H_2O_2$ and as $H_2O_2$ receptors and transducers, 2-Cys Prxs have been highly instrumental to understand the biological impact of $H_2O_2$, and in particular its signaling function. 2-Cys Prxs can also become potent chaperone holdases, and unveiling the in vivo relevance of this function, which is still not established, should further increase our knowledge of the biological impact and toxicity of $H_2O_2$. The diverse molecular functions of 2-Cys Prx explain the often-hard task of relating them to peroxiredoxin genes phenotypes, which underscores the pleiotropic physiological role of these enzymes and complex biologic impact of $H_2O_2$.

• Journal of Applied Biological Chemistry
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• 제66권
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• pp.492-502
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• 2023

This study investigated the antioxidant and immune enhancement activities of Artemisia argyi H. fermented by Lactobacillus plantarum. The fermented A. argyi H. ethanol extract increased scavenging activities of 1,1-diphenyl-2-picrylhydrazyl (DPPH), 2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS⁺), hydroxyl (·OH), and superoxide (O₂^-) radicals. Particularly, the ethanol extract of fermented A. argyi H. exhibited higher ·OH and O₂^- radical scavenging activities, compared with DPPH and ABTS⁺ radical scavenging activities. To evaluate the immune enhancement effects of the fermented A. argyi H., mice were fed a normal diet supplemented the fermented A. argyi H. at concentrations of 1%, 2%, and 5%, respectively. The supplementation of fermented A. argyi H. dose-dependently increased splenocyte proliferation. In addition, mice fed with 5% fermented A. argyi H. showed enhanced proliferation of T-cells and B-cells, along with increased levels of interferon-γ, interleukin-10, and tumor necrosis factor-α, compared to the normal group. Furthermore, mice fed with fermented A. argyi H. exhibited an increase in prominent probiotics such as Akkermansia muciniphila and Lactobacillus in gut microbiota, compared to the normal group. This study suggests that fermented A. argyi H. with Lactobacillus plantarum could be used as a dietary antioxidant and immune enhancement agent.

• 원예과학기술지
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• 제34권3호
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• pp.383-395
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• 2016

This study investigated the effect of exogenous hydrogen peroxide ($H_2O_2$) on the antioxidant responses and growth of warm-season turfgrass (Zoysia japonica Steud.) and cool-season turfgrass (Poa pratensis L.) subjected to drought stress. Compared with control plants that were not pretreated with $H_2O_2$, plants pretreated with $H_2O_2$ had significantly greater fresh and dry weights of shoots and roots, and increased water content. $H_2O_2$ pretreatments before drought stress significantly decreased the concentrations of malondialdehyde and $H_2O_2$. DPPH radical scavenging and glutathione activities were significantly increased. The responsive activities of the antioxidant enzymes superoxide dismutase, ascorbate peroxidase, catalase, and peroxidase were also significantly enhanced. Our results suggest that exogenous $H_2O_2$ could improve the growth of warm-season and cool-season turfgrass under drought stress by increasing the activity of their antioxidant enzymes, while decreasing lipid peroxidation.

• 생명과학회지
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• 제29권10호
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• pp.1164-1170
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• 2019

본 연구는 은행외종피 추출물의 항산화 및 DNA 손상 보호용 조성물에 관한 것으로 HaCaT 세포에서 은행외종피 물과 메탄올 추출물의 과산화수소의 공격에 대한 항산화 효과 및 DNA 손상보호에 대한 것이다. 이를 위해 은행외종피 물 추출물(GOSWE)와 은행외종피 메탄올 추출물(GOSME)의 항산화력을 위해서는 DPPH와 과산화수소 소거능을 실시하였다. GSOWE와 GOSME는 DPPH 소거능에서 다소 차이를 보였다. 더욱이, GOSME는 과산화수소 소거능에서 GOSWE보다 탁월한 효과를 발휘하였다. 1 mM $H_2O_2$ 처리된 HaCaT 세포의 세포생존실험에서 GOSME는 세포생존력을 향상시켰다. GOSME는 1 mM $H_2O_2$에 의한 플라스미드 DNA 단편화 저해능과 HaCaT세포에서 게놈 DNA 단편화 억제능이 있는 것으로 확인되었다. 이러한 결과는 GOSME는 활성산소제거를 통한 산화적 스트레스관련 세포손상 억제를 통한 세포사멸억제 및 과산화수소 유발 DNA 손상을 억제 할 수 있다는 것을 제시하였다. 결론적으로 GOSME는 산화적스트레스에 의한 피부질환에 대한 치료 및 방어제로 이용 될 수 있는 신소재로 평가 할 수 있다.

• 한국지반환경공학회 논문집
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• 제13권7호
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• pp.49-54
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• 2012

본 연구에서는 전자빔(E-beam) 공정을 이용한 펜타클로로페놀(Pentachlorophenol, PCP)의 분해 특성을 조사하였다. 이를 위해 주어진 반응시간(0.6 s) 동안 생성될 수 있는 각종 반응성 화학종의 농도를 예측하였으며, PCP 분해에 미치는 pH와 과산화수소의 영향 및 이에 따른 G-value 등을 조사하였다. 실험결과, 전자빔공정에서 PCP의 분해는 pH의 영향을 받지 않았다. 1mM 이하의 과산화수소의 주입은 PCP 분해를 촉진시킬 수 있으나 그 이상의 과산화수소의 주입은 오히려 PCP의 분해를 감소시키거나 부산물의 형성을 유도할 것으로 관찰되었다. 특히, 옥살산과 미확인된 유기염소 성분의 농도를 증가시키는 것으로 나타났다. 그래서 전자빔공정에서 수산화라디칼의 발생원으로써 적절한 농도의 과산화수소 주입이 고려되어야 할 것으로 생각된다.

• 한국자원식물학회지
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• 제22권6호
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• pp.498-505
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• 2009

The plant Agastache rugosa Kuntze has various physiological and pharmacological activities. Especially, it has been regarded as a valuable source for the treatment of anti-inflammatory and oxidative stress-induced disorders. However, little has been known about the functional role of it on oxidative damage in mammalian cells by ROS. In this study, we investigated the DPPH radical, hydroxyl radical, hydrogen peroxide and intracellular ROS scavenging capacity, and $Fe^{2+}$ chelating activity of the extracts from Agastache rugosa. In addition, we evaluated whether the extract can be capable of reducing $H_2O_2$-induced DNA and cell damage in NIH 3T3 cells. These extracts showed a dose-dependent free radical scavenging capacity and a protective effect on DNA damage and the lipid peroxidation causing the cell damage by $H_2O_2$. Therefore, these results suggest that Agastache rugosa is useful as a herbal medicine for the chemoprevention against oxidative carcinogenesis.

• Journal of Acupuncture Research
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• 제15권2호
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• pp.135-145
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• 1998

Bupleury radix has been used for the treatment of fever, liver disease, inflammation in traditional medicine. The present study was carried out to evaluate the antioxidant effects of Bupleury radix aqua-acupuncture solution (BRAS) in vitro. Oxygen derived free radicals produced in the course of normal aerobic life, such as superoxide anion radical($O_2^-$ ), hydroxyl radicaI( OH), hydrogen peroxide($H_2O_2$) and singlet oxygen($^1O_2$) can attack polyunsaturated fatty acid in cell membranes, enzymes, other cell compounds, and give rise to lipid peroxidation, DNA damage, lipofuscin accumulation, structure alteration of cell membrane and cell death. In this study, antioxidant effects of BRAS on lipid peroxidation were determined according to the method of TBA. BRAS inhibited markedly peroxidation of linoleic acid during the autoxidation, and also inhibited lipid peroxidation induced by hydroxyl radical derived from $H_2O_2-Fe^{2+}$ in rat liver homogenate. And BRAS showed 30% scavenging effect on DPPH radical, also exhibited a 30% inhibitory effect on superoxide generation from xanthine-xanthine oxidase system. In addition, BRAS protected the cell death induced by tert-butyl hydroperoxide(t-BHP) and significantly increased cell viability in the normal rat liver cell(Ac2F).

• 대한한방부인과학회지
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• 제25권2호
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• pp.78-88
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• 2012

Objectives: Paeonia japonica has been widely used for gynecopathy and analgesic effects in Korean Traditional Medicine. The aim of the present study is to determine the antioxidant effect of Paeonia japonica extracts(PJE) by using mouse embryonic fibroblast cells(MEF cells). Methods: We evaluated Radical Scavenging Activity of PJE by the DPPH assay. Protective effect of the PJE on the hydrogen peroxide($H_2O_2$) induced oxidative damage of MEF cells was analyzed by the MTT assay. The Morphological changes of MEF cells induced by P. japonica, $H_2O_2$ and P. japonica+$H_2O_2$ was evaluated by DAPI staining. And effect of PJE on the rate of apoptosis in MEF cells was measured using flow cytometry with Annexin V-FITC and PI double staining. Results: We observed that PJE contain significant DPPH radical scavenging activity. Cell viability of oxidative damaged cells treated with various concentrations of $H_2O_2$ was increased by treatment with PJE. Flow cytometric analysis of the cells treated with $H_2O_2$ in the absence or presence of PJE showed that the crumbled G1 peak was accumulated by the treatment with $H_2O_2$ alone, but restored by addition of PJE. Portion of cells that undergo apoptosis mediated by oxidative stress was decreased by treatment of PJE. The nuclear fragmentation occurred in the oxidative damaged MEF cells was also decreased by PJE treatment. Conclusions: Taken together, our results suggest that PJE exhibits significant antioxidant activity and functions to inhibit cell death mediated by oxidative damage induced apoptotic pathways.

• Fisheries and Aquatic Sciences
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• 제14권3호
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• pp.179-185
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• 2011

The antioxidant activities of a methanolic extract of Eisenia bicyclis and its organic solvent fractions, including dichloromethane ($CH_2Cl_2$), ethyl acetate (EtOAc), n-butanol (n-BuOH), and water ($H_2O$) fractions, were investigated. Scavenging activities against DPPH, hydroxyl, superoxide anion, and peroxynitrite radicals were evaluated using electron spin resonance spectrometry; intracellular reactive oxygen species (ROS) were evaluated by a 2',7'-dichlorofluorescein diacetate assay using RAW264.7 mouse macrophages. The antioxidant activities of the individual fractions were: EtOAc>n-BuOH>$CH_2Cl_2$ >$H_2O$. The EtOAc fraction exhibited strong radical scavenging activity and a significantly reduced ROS level in RAW264.7 cells. Moreover, the phenolic contents of the extract and fractions followed the same order as their radical scavenging activities. Our results indicate that E. bicyclis is a valuable natural source of antioxidants that may be applicable to the functional food industry.