• Natural Product Sciences
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• v.17 no.1
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• pp.58-63
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• 2011

Insampaedok-san is a traditional medicine used for the treatment of colds. We investigated several compounds in Insampeadok-san, and tested their neuroprotective and anti-oxidative activities after fermentation with Lactobacillus. The amounts of four marker compounds (ferulic acid, hesperidin, 6-gingerol and glycyrrhizin) and unidentified compounds in Insampaedok-san (IS) and fermented Insampaedok-san (FIS) were measured and compared by an established HPLC-DAD method. Neuroprotective activity of IS and FIS extracts was evaluated and compared after glutamate-induced neurotoxicity in HT22 cells. Anti-oxidative activity of IS and FIS was also compared in DPPH free radical, hydroxyl radical and hydrogen peroxide scavenging activity assays. Contents of two compounds, ferulic acid and glycyrrhizin were decreased while 6-gingerol was increased by fermentation. FIS showed more potent neuroprotective activity than IS. DPPH, hydroxyl radical and hydrogen peroxide scavenging was slightly increased by FIS when compared to IS. In conclusion, fermentation with Lactobacillus can vary the amounts of the marker compounds in IS and improve neuroprotective and anti-oxidative activities of IS.

• Proceedings of the Korean Society of Applied Pharmacology
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• 2003.11a
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• pp.61-61
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• 2003

The ethanol extract of peony root (Paeonia Lactiflora Pall, Paeoniaceae) and its major active components including gallic acid and methyl gallate were evaluated for their protective effects against free radical generation and lipid peroxidation. And protective effects against hydrogen peroxide-induced oxidative DNA damage in a mammalian cell line were performed. The ethanol extract of peony root (PRE), gallic acid and methyl gallate were shown to possess the significant free radical scavenging effect against 1,1-diphenyl-2-picryl hydrazine (DPPH) radical generation and were revealed the inhibitory effect of lipid peroxidation as expressed by malondialdehyde (MDA) formation. They were also found to strongly inhibit hydrogen peroxide-induced DNA damage from NIH/3T3 fibroblasts, assessed by single cell gel electrophoresis. Furthermore, oral administration of 50% PRE (50% ethanol extract), gallic acid and methyl gallate potently inhibited micronucleated reticulocyte (MNRET) formation of mouse peripheral blood induced by KBrO3 treatment in vivo. Therefore, PRE containing gallic acid and methyl gallate may be a useful natural antioxidant by scavenging free radicals, inhibition of lipid peroxidation and protecting oxidative DNA damage.

• Journal of Physiology & Pathology in Korean Medicine
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• v.25 no.1
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• pp.115-121
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• 2011

This study was performed to investigate the antioxidant activity of extracts of black Panax ginseng (BGE) and its crude saponin (BGECS). The antioxidant activities of BGE and BGECS were evaluated for free radical scavenging activity against stable free radical (1,1-diphenyl-2-picrylhydrazyl) DPPH, nitrite, hydrogen peroxide and superoxide. In addition, the antioxidant activity of BGE and BGECS against peroxyl radicals, hydroxyl radicals and peroxynitrites were determined by the total oxy-radical scavenging capacity (TOSC) assay. As a result, BGE and BGECS were found to have a strong inhibitory activity with >90% against the DPPH radical at $1000{\mu}g/m{\ell}$ concentrations. Also, BGE and BGECS exhibited strong inhibitory activity with >80% against hydrogen peroxide at lower concentration ($125{\mu}g/m{\ell}$). Moreover, specific TOSC values (405 and 473 TOSC/mM) of BGE and BGECS against peroxynitrites were higher than GSH (347 TOSC/mM) used a positive control. These results suggest that BGE and BGECS could be useful to develop functional foods against disease related oxidative stress.

• Tribology and Lubricants
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• v.4 no.1
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• pp.43-55
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• 1988

A Study on the effect of the additives in lubricating oil was investigated on the basis of the thermal activated wear theory in terms of their wear behaviours, using four ballwear machine. The sample oils, which included diethyl-3, 5-di-t-butyi-4-hydroxy-benzyl phosphonate (DEP), ZDDP and TCP additives respectively, showed distinct wear characteristics depending upon the bulk oil temperature and the sliding velocity. The newly synthesized additive, viz., DEP showed excellent antiwear performance cornpared with the conventional additives, ZDDP and TCP. On the basis of the experimental results, it is reduced that the wear mechanism of the conventional additives, viz., ZDDP and TCP is the protective film formation and their antiwear capability is depending upon the shearing strength of the film formed. On the other hand, the new additive, DEP showed that the secondary activation energy was much eliminated and so, the thermal instability was reduced by the hydrogen scavenging reaction of the new additive, which was virtually an endothermic reaction process.In conclusion, a new concept of antiwear mechanism is estabilished and testified. And new chemical, which showed the function of hydrogen and free radical scavenging role, is synthesized and introduced as the new, highly antiwear effective lubricating oil additive.

• Journal of Physiology & Pathology in Korean Medicine
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• v.29 no.6
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• pp.475-484
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• 2015

In this paper, we studied the anti-oxidative capacities and protective effects of water extract of Gagam-Danguieumja(GDE) against Ultraviolet B(UVB)-induced oxidative damage in human keratinocytes(HaCaT). To evaluate the anti-oxidative activities of GDE, we measured scavenging activities on DPPH radical, hydroxyl radical, hydrogen peroxide, superoxide anion, lipid peroxidation and reducing power of GDE. To detect the protective effects of GDE against UVB, we irradiated with 40 mJ/㎠`s UVB to HaCaT cells then we measured reactive oxygen species(ROS) generation, apoptotic bodies and cell viability using DCFH-DA assay, Hoechst 33342 staining and MTT assay. GDE showed the anti-oxidative activities by scavenging DPPH radical, hydroxyl radical, hydrogen peroxide, superoxide anion, lipid peroxidation. Also GDE showed high reducing values. GDE reduced oxidative stress conditions by inhibition of ROS expression. Also the cell apoptosis by UVB-induced oxidative conditions was decreased by GDE treatment. These results could suggest that GDE had anti-oxidative activities and exhibited protective effects against UVB on HaCaT cells. GDE would be useful for the development of cosmetics treating UVB-induced skin aging.

• International Journal of Oral Biology
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• v.34 no.1
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• pp.15-20
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• 2009

In our present study, total methanol extracts prepared from B. platyphylla var. japonica showed a significant increase in cell proliferation upon the induction of oxidative stress by hydrogen peroxide or $\gamma$-ray irradiation. Total methanol extracts were fractionated into five separate preparations i.e. n-hexane, dichloromethane, ethylacetate, n-butanol and water fractions. Among these, the ethylacetate and butanol fractions of B. platyphylla var. japonica showed the highest protective effects against oxidative stress induced by hydrogen peroxide. These fractions also showed strong protective effects against $\gamma$-ray irradiation. When we evaluated the cytotoxicity of these fractions, the butanol fraction showed no effects in a colony formation assay. In addition, the butanol fraction showed a cell proliferation activation effect evidenced by significant increase in the colony formation of $\gamma$-ray irradiated cells. Both a radical scavenging activity and clonogenic activity assay suggested that the mechanism behind this protective effect against reactive oxygen species may be due to the radical scavenging and cell proliferation activity of B. platyphylla var. japonica extracts.

• Applied Biological Chemistry
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• v.47 no.2
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• pp.279-282
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• 2004

An antioxidant was isolated from Korean mistletoe (Viscum album var. coloratum) by consecutive purification using silica gel, Sephadex LH-20, and RP-HPLC. The active principle was identified as homo-flavoyadorinin-B (3',7-dimethoxyluteolin-4'-O-[apiosyl $(1{\rightarrow}2)$ glucoside]) by spectral analyses. It inhibited 74.6% of hydroxyl radical and 30.6% of superoxide anion radical at 0.01 mM; however, th~compound did not show any scavenging activity against hydrogen peroxide radical. At 0.1 mM, above compound scavenged superoxide anion radical about twice as effective as positive controls, BHT and ${\alpha}-tocopherol$. Radical scavenging activities of homo-flavoyadorinin-B on DPPH, hydroxyl, and hydrogen peroxide radicals were almost same with those of positive controls.

• Journal of Applied Biological Chemistry
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• v.54 no.2
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• pp.89-93
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• 2011

The solvent extracts of Sanguisorbae officinalis L. were investigated for the activities of antioxidants as a functional ingredient for cosmetic products. The electron donating effect of ethyl acetate layer and n-butyl alcohol layer was appeared similar activity with positive control butylated hydroxy anisole (BHA) at all concentrations. In addition, in 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid (ABTS) radical scavenging assay, ethyl acetate layer, n-butyl alcohol layer and water layer were over 99% effect at all concentrations and higher than that of BHA. Also in hydrogen peroxide scavenging assay, ethyl acetate layer and n-butyl alcohol layer were higher than that of positive control ascorbic acid. The measured superoxide dismutase (SOD)-like activity of n-butyl alcohol was more than 50% at concentration of 1,000 ${\mu}g/mL$ and superoxide anion radical scavenging ability showed more than 45% at 1,000 ${\mu}g/mL$ of n-butyl alcohol layer. All these findings suggested that ethyl acetate layer and n-butyl alcohol layer have a great potential as a cosmeceutical ingredient with an antioxidant effect.

• Journal of the Korean Society of Food Science and Nutrition
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• v.37 no.10
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• pp.1318-1322
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• 2008

The aim of this study was to analyze the antioxidant properties of Lycii folium extracts prepared from different solvents. Lycii folium were extracted with water, 80% ethanol (80% EtOH), 80% methanol (80% MeOH) and 100% methanol (100% MeOH) in water bath at $40^{\circ}C$. The antioxidant activity of the extracts was evaluated using DPPH, hydroxyl and hydrogen radical scavenging activities, and SOD-liked activity. Total phenolic acid contents were 1.085 mg/mL in 100% MeOH, 1.382 mg/mL in 80% EtOH, 1.420 mg/mL in 80% MeOH and 1.084 mg/mL in water. DPPH radical scavenging activity of the extracts were 65.60% in 80% EtOH, 56.80% in 80% MeOH, 83.85% in 100% MeOH and 54.65% in water. Hydroxyl radical scavenging activities were 66.65% in 100% MeOH, 73.13% in 80% ethanol, 73.58% in 80% MeOH and 70.73% in water. Hydrogen radical scavenging activity of the extracts prepared from Lycii folium were 11.70% in 100% MeOH, 33.73% in 80% EtOH, 35.40% in 80% M eOH and 23.86% in water. SOD-liked activity of the extracts prepared from Lycii folium was 71.58% in 100% MeOH, 74.29% in 80% EtOH, 88.46% in 80% MeOH and 67.47% in water. Our result showed that Lycii folium extracts prepared from 80% methanol were found to be promising biomaterials with antioxidant effects.

• Journal of Life Science
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• v.25 no.11
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• pp.1311-1318
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• 2015

The effects of fruit maturation on changes in the total phenolics, flavonoids, and carotenoids of methanolic extracts of Citrus sudachi, in addition to its antioxidant and antidiabetic activities, were determined. Generally, the concentration of these chemical constituents increased as C. sudachi reached maturity. C. sudachi contained high levels of total phenolics, flavonoids, and carotenoids at maturity, contributing 6339.5 mg of gallic acid equivalent per 100 g, 2364.2 mg of rutin equivalent per 100 g, and 678.7 mg/ml, respectively. The scavenging activities of 1,1-diphenyl-2-picryl hydrazyl (DPPH), hydrogen peroxide and nitric oxide radicals and the reducing power of mature fruits were significantly higher at all data points than those of immature fruits (p<0.05). In contrast, the ferrous ion chelating activity of mature and immature C. sudachi fruits was similar. The 50% effective concentrations (EC₅₀) of mature fruits were 4.1±0.10 mg/ml for scavenging DPPH radicals, 3.1±0.02 mg/ml for scavenging hydrogen peroxide, 3.9±0.01 mg/ml for scavenging nitric oxide, and 3.8±0.02 mg/ml for chelating ferrous ion. The antidiabetic activity of C. sudachi was studied in vitro using the α-glucosidase inhibitory method. The inhibitory activity of mature C. sudachi fruits on α-glucosidase was higher than that of immature fruits. These results suggest that the content of bioactive compounds and the antioxidant and antidiabetic activities of C. sudachi change during maturation. These findings can be further extended to exploit them for their possible application for the preservation of food products, as well as their use as health supplements and nutraceuticals.