• Journal of Physiology & Pathology in Korean Medicine
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• v.25 no.6
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• pp.1039-1043
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• 2011

The purpose of this study is to investigate the modulatory effect of emodin on hydrogen peroxide production in human blastoma SH-SY5Y cells induced by the synthetic analog of double-stranded RNA [polyinosinic-polycytidylic acid]. Hydrogen peroxide production was measured by dihydrorhodamine 123 (DHR) assay. Emodin significantly inhibited the polyinosinic-polycytidylic acid (PIC)-induced production of hydrogen peroxide for 0.5, 2, 12, 18, and 24 hr incubation at the concentrations of 5, 10, 25, and 50 uM in SH-SY5Y (P < 0.05) in dose dependent manner. These results suggest that emodin has neuroprotective property related with its inhibition of hydrogen peroxide production in PIC-induced neuronal cells.

• Biotechnology and Bioprocess Engineering:BBE
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• v.7 no.4
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• pp.231-233
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• 2002

The potential of calcium peroxide to act as an agent for waterblooming control was In-vestigated by examining the growth inhibition of Microcystis aerusinosa. Due to the chemical nature of calcium peroxide, it can remove dissolved phosphate by forming an Insoluble precipitate, generating radicals, coagulant, and oxygen as byproducts as it dissolves in water. The growth of M. aerusinosa was severely inhibited and the chlorophyll-n concentration was drastically decreased in the presence of calcium peroxide. With 200 ppm of calcium peroxide dosage, a chlorophyll-a concentration of 1,700 mg/m$^3$ was lowered to below 10% of its initial concentration after 4 days. One possible explanation for this growth Inhibition is the removal of the available phosphate by calcium peroxide.

• Journal of Physiology & Pathology in Korean Medicine
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• v.28 no.4
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• pp.384-389
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• 2014

The purpose of this study is to investigate the modulatory effect of oroxylin A on hydrogen peroxide production in TM4 mouse testis sertoli cells induced by the synthetic analog of double-stranded RNA [polyinosinic-polycytidylic acid]. Hydrogen peroxide production was measured by dihydrorhodamine 123 (DHR) assay. Oroxylin A significantly inhibited the polyinosinic-polycytidylic acid (PIC)-induced production of hydrogen peroxide for 0.5, 2, 12, 18, and 24 hr incubation at the concentrations of 5, 10, 25, and $50{\mu}M$ in TM4 (P < 0.05) in dose dependent manner. These results suggest that oroxylin A has a protective effect against PIC-induced cellular toxicity with its inhibition of hydrogen peroxide production in PIC-induced sertoli cells.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.36 no.1
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• pp.61-66
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• 2004

Bleached chemithermomechanical pulp (BCTMP) was produced from CTMP of Betula maximowicziana Regel by two staged ozone-hydrogen peroxide bleaching in order to improve the optical properties of high yield pulp. This pulp was used for the evaluation of optical properties improvement, chemical characteristics of lignin in fiber and the relationship between lignin and optical properties in fiber cell wall. Hydrogen peroxide treatment improved the brightness, but the post color number (PC No.). There was little improvement on optical properties by ozone treatment, but this could be improved more by using two staged ozone-hydrogen peroxide bleaching. The hydrogen peroxide treatment did not make any change on chemical characteristics of lignin in cell wall, but by ozone treatment, it was found that the non-aromatic conjugated structure was existed in the surface of cell wall, but this could be removed by hydrogen peroxide treatment in two staged ozone-hydrogen peroxide treatment. Therefore, the optical properties was significantly improved, due to the removal of non-aromatic conjugated structure.

• Journal of Physiology & Pathology in Korean Medicine
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• v.23 no.5
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• pp.1049-1054
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• 2009

The effect of Sacchromyces cerevisiae-Fermented Sophorae Radix water extract (SFS) on production of hydrogen peroxide and nitric oxide (NO) from mouse macrophage Raw 264.7 Cells treated with nicotine (1 mM) was investigated through this study. SFS (0, 25, 50, 100, 200, 400 ug/mL) was simultaneously treated with nicotine (1 mM) during culture of 4, 20, 24, 44, 48, 68, and 72 hr. And the intracellular productions of hydrogen peroxide were measured by dihydrorhodamine 123 (DHR) assay. NO production after 24 hr treatement was measured with Griess reagent assay. SFS restored the production of hydrogen peroxide and NO reduced by nicotine (1 mM) in Raw 264.7 Cells. These results suggests that SFS could be supposed to have the immunological activity concerned with macrophage's oxidative burst including hydrogen peroxide and NO.

• Journal of Physiology & Pathology in Korean Medicine
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• v.26 no.4
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• pp.491-496
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• 2012

The purpose of this study is to investigate the modulatory effect of wogonin on hydrogen peroxide production in human blastoma SH-SY5Y cells induced by the synthetic analog of double-stranded RNA [polyinosinic-polycytidylic acid]. Hydrogen peroxide production was measured by dihydrorhodamine 123 (DHR) assay. Wogonin significantly inhibited the polyinosinic-polycytidylic acid (PIC)-induced production of hydrogen peroxide for 0.5, 2, 12, 18, and 24 hr incubation at the concentrations of 10, 25, and 50 ${\mu}M$ in SH-SY5Y (P < 0.05) in dose dependent manner. These results suggest that wogonin has neuroprotective property related with its inhibition of hydrogen peroxide production in PIC-induced neuronal cells.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2004.09a
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• pp.191-194
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• 2004

The concentration of hydrogen peroxide in soil and effluent was measured to understand the relationship between the profile of hydrogen peroxide and the removal efficiency of phenanthrene in an Electrokinetic-Fenton process. Electrokinetic phenomena were observed in two different conditions for 1, 2, 4, and 7 days; 3.5% and 10% hydrogen peroxide. The concentration of hydrogen peroxide in soil was high near the anode and decreased towards the cathode due to the direction of electroosmosis. The hydrogen peroxide concentration in effluent increased with time, but the value was lower than the initial. The removal efficiency of phenanthrene at 10% hydrogen peroxide was higher than the case at 3.5%. The removal efficiency after 7 days was high(> 97%) in both cases.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2004.03a
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• pp.131-136
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• 2004

The ongoing developmental studies on the application of hydrogen peroxide for propulsion are briefly reviewed. A detailed design-study of a laboratory scale facility of a hydrogen peroxide mono-propellant engine of 100-N thrust is presented. For the preparation of concentrated hydrogen peroxide, a distillation facility has been realized. Results of water analogy tests are presented. Initial firings using the concentrated hydrogen peroxide were not successful. Low environmental temperature, low contact area of the catalyst pack, and contamination in the hydrogen peroxide were considered to be the reasons. Addressing the first two points resulted in successful firing of the rocket engine.

• Korean Journal of Acupuncture
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• v.28 no.3
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• pp.33-41
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• 2011

Objectives : The purpose of this study is to investigate effects of Scutellariae Radix water extract on hydrogen peroxide production in LPS-induced RAW 264.7 mouse macrophages. Methods : Scutellariae Radix produced from South Korea (SK) and Scutellariae Radix produced from China (SC) were extracted by hot water. Effects of SK and SC on hydrogen peroxide production in LPS-induced RAW 264.7 were measured by dihydrorhodamine 123 assay after 20, 24, 28, 44, 48, and 52 h incubation at the concentrations of 10, 25, 50, and 100 ug/mL. Results : SK significantly increased hydrogen peroxide production in LPS-induced RAW 264.7 cells for 20, 24, 28, 44, 48, and 52 h incubation at the concentrations of 10, 25, 50, and 100 ug/mL (P < 0.05). But SC did not represent any significant effect on hydrogen peroxide production in LPS-induced RAW 264.7 cells. Conclusions : These results suggest that Scutellariae Radix, especially produced from South Korea, has the immune-enhancing property related with its increasement of bacteriocidal hydrogen peroxide production in LPS-induced macrophages.

• Korean Journal of Human Ecology
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• v.14 no.3
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• pp.433-439
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• 2005

In this study, we investigated the morphological and physical changes of hair after bleaching treatments with different concentration of hydrogen peroxide in bleaching agent (3, 6, 9, or 12%) and various treatment time (10, 30, or 60 minutes). Tresses of virgin black hair were bleached using a commercial ammonium persulfate-hydrogen peroxide solution. The tensile strength of virgin hair treated with a bleaching agent depended on the concentration of hydrogen peroxide and the treatment time. As the concentration of hydrogen peroxide in bleaching agent went high and the treatment time increased, the tensile strength of the hair increased but the extension degree decreased. The virgin hairs which were not treated by bleaching agent showed morphologically healthy cuticle, whereas the bleached hairs showed swelled and damaged cuticle patterns. The swelling of the hair and the breaks of the cuticles increased positively by the concentration of hydrogen peroxide and the treatment time. These results suggest that exposure to more concentrated hydrogen peroxide with other bleaching components may lead to more severe hair damage.