• Korean Journal of Materials Research
• /
• v.15 no.12
• /
• pp.760-764
• /
• 2005

The influences of the oxidant($O_2\;and\;O_3$) on the FeOOH formation were studied with fixed $FeSO_4{\cdot}7H_2O$ concentration (0.5M) and NaOH equivalent ratio(0.5). The characteristics of the synthesized powders were evaluateed by XRD, and equantitative phase analysis. $\alpha-FeOOH$ (Geothite) and/or $\gamma-FeOOH$ was promoted when $O_3$ was used as a oxidant which is stronger oxidizing agent than $O_2$.

• The Journal of Internal Korean Medicine
• /
• v.18 no.1
• /
• pp.147-155
• /
• 1997

This study was undertaken to determine whether Salviae-radix (SVR) exraction exerts benefical effect against oxidant-induced inhibition of tetraethylammonium (TEA) uptake which is actively secreted by renal proximal tubules. TEA uptake increased as function of incubation time to 60 min. When renal cortical slices were exposed to 50 mM $H_2O_2$, TEA uptake was significantly inhibited. The inhibition was significantly protected by addition of 0.5% SVR extraction. The benefical effect of SVR was dose-dependent over the concentration range of 0.1-1%; $H_2O_2$ (50 mM)-induced inhibition of TEA uptake was completely protected by 0.5-1% SVR extraction. $H_2O_2$ increased LDH release which was accompanied by an increase in lipid peroxidation in renal cortical slices. These changes were prevented by 0.5% SVR. These results suggest that SVR exerts benefical effect against oxidant-induced impairment of membrane transport function, this effect may be due to by an antioxidant action.

• Journal of Pharmacopuncture
• /
• v.10 no.1 s.22
• /
• pp.5-16
• /
• 2007

Objectives : The aim of this study was to verify anti-cancer and anti-oxidant efficacies of Korean wild ginseng and cultivated wild ginseng of Korea and China. Methods : For the measurement of anti-oxidation, SOD-like activity was evaluated using xanthine oxidase reduction method under in vitro environment. Subcutaneous and abdominal cancer were induced using CT-26 human colon cancer cells for the measurement of growth inhibition of cancer cells and differences in survival rate. Results : 1. Measurement of anti-oxidant activity of ginseng, Chinese and Korean cultivated wild ginseng, and natural wild ginseng samples showed concentration dependent anti-oxidant activity in HX/XOD system. Anti-oxidant activity showed drastic increase at 1mg/ml in all samples. 2. For the evaluation of growth inhibition of cancer cells after hypodermic implantation of CT-26 cancer cells in the peritoneal cavity of mice, Chinese and Korean cultivated wild ginseng and natural wild ginseng groups showed significant inhibition of tumor growth from the 12th day compared to the control group. Similar inhibitory effects were also shown on the 15th and 18th days. But there was no significant difference between the experiment groups. 3. For the observation of increase in survival rate of the natural wild ginseng group, CT-26 cancer cells were implanted in the peritoneal cavity of mice.

• The Korea Journal of Herbology
• /
• v.21 no.4
• /
• pp.103-107
• /
• 2006

Objectives : This study was investigated to analyze the anti-oxidant activity of water and ethanol extracts from the Magnoliae Flos. Methods : The effects on electron donating ability (EDA), SOD-like activity and xanthine oxidase inhibition have been investigated the anti-oxidant activity for utilization as a natural material of cosmetics. Results : This study was investigated to analyze the anti-oxidant activity of water and ethanol extracts from the Magnoliae Flos. In the electron donating ability test, water and ethanol extract from Magnoliae Flos showed an effect of 75.6% and 83.5% at 1,000 ppm concentration, respectively. In the superoxide dismutase (SOD)-like activity, 1,000 ppm of water extract showed an effect of 45.2% and ethanol extract showed an effect of 64.2%. Xanthine oxidase showed a meaningful inhibitory effect of 68.8% in water extract and 23.2% at 1,000 ppm in ethanol extract. Conclusion : From these results, Magnoliae Flos showed the development possibility as a natural material of anti-oxidant cosmetics.

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 1997.10a
• /
• pp.19-27
• /
• 1997

• Resources Recycling
• /
• v.3 no.2
• /
• pp.17-23
• /
• 1994

The dissolution of gold and silver from concentrate was studied with acidic thiourea solution. The results showed that the gold and silver extraction was severely affected by concentration of thiourea and oxidant, pulp density, etc. Especially, oxidant such as ferric ions enhanced the leching rate of gold and silver. High concentration of ferric ions, however, dissolved the sulfide ore to form electrochemically passive layer on the surface of ore particles, which caused the precious metal not to be leached out from the ore. The use of $SO_2$could not effectively enhance the recovery of precious metal but reduce to some extent the consumption of thiourea. The leaching of gold and silver was achieved with recovery more than 90% and 80%, respectively, under the following conditions; Thiourea conc. :0.4M Oxidant : None $H_2SO_4$ conc. : 0.5M Pulp density : <10% Leaching time :4 Hrs Potential :250mV The Thiourea was consumed about 10% in comparison with its initial concentration.

• The Korea Journal of Herbology
• /
• v.22 no.3
• /
• pp.85-91
• /
• 2007

Objective : In this study, anti-oxidant and cosmeceutical activities of Isatis tinctoria L. extracted from water, ethanol and supercritical fluid condition were confirmed to investigate cosmeceutical activities for utilization as cosmetic ingredient. Methods: Anti-oxidant and cosmeceutical activities were investigated by using electron donating ability, xanthine oxidase, tyrosinase, astringent effect. Result : Isatis tinctoria L. extracts by supercritical fluid, water and ethanol showed good electron donating ability which were 82.7%, 62.6% and 44.8% at the concentration at 1,000ppm, respectively. Xanthine oxidase activity related with purine metabolism was inhibited by ethanol extract about 52.3% at the concentration at 1,000ppm. Tyrosinase inhibition effects, by supercritical fluid extract, ethanol extract and water extract, were 83.3%, 52.9% and 41.2% respectively at 1,000ppm. In the measurement of astringent effect, supercritical fluid extract at the concentration to 5,000ppm showed 85.7% in related activity. The water extract showed 95.9% nitrite scavenging activity at 5,000ppm. Conclusion : According to these results, it is possible that the extract of Isatis tinctoria L. can be used as a new natural material of cosmetic industry.

• Journal of Korean Society of Environmental Engineers
• /
• v.38 no.11
• /
• pp.596-602
• /
• 2016

Potassium iodide (KI) TRO sensor for measuring total residual oxidant which is an index for disinfection and neutralization in ballast water has been constructed. The results of UV absorption wavelength and absorbance test in various TRO concentrations show high linear correlation ($r^2=0.9825$) at 350 nm wavelengths and it can be possible to visualize numerical value of TRO concentration (0.1~7.0 mg/L). The result of comparison test according to TRO concentration between the KI based TRO sensor system and the DPD based TRO sensor system showed identical trend. Overall results indicated that the KI TRO sensing system could be applied for continuous TRO concentration measurement in ballast water treatment system.

• Animal Bioscience
• /
• v.35 no.5
• /
• pp.721-729
• /
• 2022

Objective: An experiment was conducted to determine the effects of supplementing graded concentrations of inorganic sulphur (S) without and with folic acid (FA) in maize-soybean meal diets on performance, slaughter and anti-oxidant variables, immune responses and serum protein fractions in broiler chicken. Methods: Inorganic S was supplemented at 0.05%, 0.10%, 0.15%, and 0.20% alone or in combination with FA (4 mg/kg) in basal diet (BD) containing no supplemental methionine (Met) and FA. A control group was fed with the recommended concentration of Met. Each diet was offered to 10 pens of 5 male broiler chicks (Cobb 400) and fed ad libitum from day 1 to 42. Results: The broilers fed the BD had lower body weight gain (BWG), feed efficiency (FE), higher lipid peroxidation (LP), lower activity of glutathione peroxidase (GSHPx), lower lymphocyte proliferation ratio (LPR), and reduced concentrations of total protein, albumin, and globulin in serum. Supplementation of FA and S to the BD improved the BWG (all concentrations of S) and FE (0.20% S) similar to the control group. Similarly, the combination of S and FA significantly improved the concentrations of total protein, albumin, and globulin in serum, reduced the LP and increased the activity of GSHPx and LPR. However, responses in the above parameters were related to the concentration of S in the diet. The slaughter variables and antibody titres against the Newcastle disease were not affected with the treatments. Conclusion: Based on the results, it is concluded that the combination of S (0.2%) and FA (4 mg/kg) improved the BWG and FE, similarly supplementation of these nutrients improved the concentration of protein fractions and reduced the stress (reduced LP and improved GSHPx) variables in serum and improved the cell mediated immune response (LPR) in broilers fed sub-optimal concentrations of Met in diet.

• The Korea Journal of Herbology
• /
• v.33 no.6
• /
• pp.1-8
• /
• 2018

Objectives : Herbal medicinal mixture (JMB) are consisted of Caryophylli Flos, Aucklandiae Radix and Angelicae Dahuricae Radix. Each of herbal medicines has studied on anti-oxidant effect. So this study was conducted to investigate efficacy and potency of JMB on anti-oxidation. Methods : The JMB was extracted at room temperature by 80% ethanol. And total polyphenol contents, total flavonoid contents in JMB ethanol extract were determined by colorimetric method. Also, DPPH, ABTS free radical scavenging capacity and reducing power of JMB ethanol extract were measured at 100, 500, 1000, $5000{\mu}g/m{\ell}$ concentrations by spectrometric assay. Positive control was used BHA (butylated hydroxyanisole). Results : The total polyphenol contents and total flavonoid contents of the extract were 55.38 mg/TAEg, 513.72 mg/RUEg, respectively. Also, DPPH free radical scavenging capacity and reducing power of JMB ethanol extract in treated concentrations (100, 500, 1000, $5000{\mu}g/m{\ell}$) increased dose dependently. In particular, DPPH free radical scavenging capacity of JMB ethanol extract at 500, 1000, $5000{\mu}g/m{\ell}$ was similar to positive control (BHA) at high concentration (50, $100{\mu}g/m{\ell}$). ABTS free radical scavenging capacity of JMB ethanol extract at 500, 1000, 5000 ug/ml was similar to BHA at high concentration (50, $100{\mu}g/m{\ell}$). Also, reducing power was showed that JMB ethanol extract at $5000{\mu}g/m{\ell}$ was similar to BHA at high concentration (50, $100{\mu}g/m{\ell}$). Conclusions : These results suggest that JMB ethanol extract has effects to scavenge free radicals. Therefore, JMB has potential and applicable benefits for development of materials and products to have anti-oxidation functions.