scholarly journals Low‐concentration hydrogen peroxide decontamination for Bacillus spore contamination in buildings

2019 ◽  
Vol 30 (1) ◽  
pp. 47-56
Author(s):  
Ronald Leroy Mickelsen ◽  
Joseph Wood ◽  
Michael Worth Calfee ◽  
Shannon Serre ◽  
Shawn Ryan ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Low Concentration ◽  
Bacillus Spore

Kinetics of the oxidation of diphenyl sulfide with hydrogen peroxide catalyzed by sodium metavanadate

1982 ◽  
Vol 60 (7) ◽  
pp. 848-852 ◽  
Author(s):  
Yoshiro Ogata ◽  
Kazushige Tanaka
Keyword(s):  
Hydrogen Peroxide ◽  
Rate Constant ◽  
Reaction Rate ◽  
Catalytic Amount ◽  
Probable Mechanism ◽  
Initial Concentration ◽  
Sodium Metavanadate ◽  
Low Concentration ◽  
Diphenyl Sulfide ◽  
Kinetics Of

The oxidation of diphenyl sulfide (Ph2S) by hydrogen peroxide in the presence of a catalytic amount of sodium metavanadate (NaVO3) has been studied kinetically by means of iodometry of hydrogen peroxide. The reaction rate is expressed as: v = k[NaVO3]st[Ph2S]2, when the concentration of catalyst is very low and [Ph2S]0/[H2O2]0 > 2, where []st and []0 mean stoichiometric and initial concentration, respectively. The effective oxidant may consist of polymeric as well as monomeric peroxyvanadate in view of the effect of concentration of catalyst on the rate. The main oxidizing species at low concentration of catalyst seems to be diperoxyvanadate VO5−. The rate constant k2 in v = k2[Ph2S]2 tends to decrease with initial concentration of H2O2, which is present in excess of the catalyst. A probable mechanism for the oxidation is discussed.

DNA Damage by Low Concentration of Hydrogen Peroxide

1989 ◽  
Vol 53 (3) ◽  
pp. 835-836 ◽  
Author(s):  
Koichi Yoshinaga ◽  
Kayo Yamamoto ◽  
Hiroe Yoshioka ◽  
Kunihiko Hasegawa
Keyword(s):  
Hydrogen Peroxide ◽  
Dna Damage ◽  
Low Concentration

scholarly journals The change of teeth color, whiteness variations and its psychosocial and self-perception effects when using low vs. high concentration bleaching gels: a one-year follow-up.

2020 ◽  
Author(s):  
Juan Estay ◽  
Pablo Angel ◽  
Cristian Bersezio ◽  
Mateus Tonetto R ◽  
Gilbert Jorquera ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Health Impact ◽  
Psychosocial Impact ◽  
Tooth Bleaching ◽  
Self Perception ◽  
High Concentration ◽  
Low Concentration ◽  
Positive Effects ◽  
One Year

Abstract Background: Dental bleaching in traditional concentrations generates greater sensitivity. In this respect, new systems of lower concentration of hydrogen peroxide for tooth bleaching appeared, with color stability unknown over time. The aim of this study was to compare the change and stability of color with low-concentration (6%) hydrogen peroxide gel in an in-office bleaching setting relative to conventional 37.5% gel, including their effects on psychosocial and esthetic self-perception, after one year.Methods: Patients (n=25) were assessed at 12 months post bleaching treatment (whitening with 6% chemo-activated alkaline formula gel versus 37.5% traditional concentration gel). Color changes were measured objectively using total variation in color (ΔE), and subjectively using Vita Classical and Vita Bleached scale (ΔSGU) by calibrated evaluators (Kappa=0.85). The Psychosocial Impact of Dental Aesthetics Questionnaire (PIDAQ) and Oral Health Impact Profile (OHIP-14) aesthetic questionnaires were used to measure the self-perception and the psychosocial impact of the bleaching protocols.Results: The effect (ΔE) of 37.5% HP (8.37 ± 2.73) was significantly better than that of 6% HP (5.27 ± 2.53) in terms of color rebound after one year of follow-up. There were significant differences in psychosocial impact and esthetic self-perception measurements prior to bleaching versus one-year post-whitening time points; positive effects were maintained.Conclusions: Low concentration (6%) achieved effective bleaching with good stability after one year, accompanied by a positive psychosocial impact and enhanced self-perception at follow-up.Trial registration: NCT03217994 (before enrollment of the first participant). Data register: July 14, 2017

scholarly journals The change of color by whiteness indexes and its psychosocial and self-perception effects when using low vs. high concentration whitening gels: a one-year follow-up.

2020 ◽  
Author(s):  
Juan Estay ◽  
Pablo Angel ◽  
Cristian Bersezio ◽  
Manuel Peña ◽  
Eduardo Fernandéz
Keyword(s):  
Hydrogen Peroxide ◽  
Health Impact ◽  
Psychosocial Impact ◽  
Tooth Bleaching ◽  
Self Perception ◽  
High Concentration ◽  
Low Concentration ◽  
Positive Effects ◽  
One Year

Abstract Background: Dental bleaching in traditional concentrations generates greater sensitivity. In this respect, new systems of lower concentration of hydrogen peroxide for tooth bleaching appeared, with color stability unknown over time. The aim of this study was to compare the change and stability of color with low-concentration (6%) hydrogen peroxide gel in an in-office bleaching setting relative to conventional 37.5% gel, including their effects on psychosocial and esthetic self-perception, after one year. Methods: Patients (n=25) were assessed at 12 months post bleaching treatment (whitening with 6% chemo-activated alkaline formula gel versus 37.5% traditional concentration gel). Color changes were measured objectively using total variation in color (ΔE), and subjectively using Vita Classical and Vita Bleached scale (ΔSGU) by calibrated evaluators (Kappa=0.85). The Psychosocial Impact of Dental Aesthetics Questionnaire (PIDAQ) and Oral Health Impact Profile (OHIP-14) aesthetic questionnaires were used to measure the self-perception and the psychosocial impact of the bleaching protocols. Results: The effect (ΔE) of 37.5% HP (8.37 ± 2.73) was significantly better than that of 6% HP (5.27 ± 2.53) in terms of color rebound after one year of follow-up. There were significant differences in psychosocial impact and esthetic self-perception measurements prior to bleaching versus one-year post-whitening time points; positive effects were maintained. Conclusions: Low concentration (6%) achieved effective bleaching with good stability after one year, accompanied by a positive psychosocial impact and enhanced self-perception at follow-up. Trial registration: NCT03217994 Keywords: Bleaching, Randomized clinical trial, Low concentration, OHIP-14 , PIDAQ

scholarly journals DNA damage by low concentration of hydrogen peroxide.

1989 ◽  
Vol 53 (3) ◽  
pp. 835-836
Author(s):  
Koichi YOSHINAGA ◽  
Kayo YAMAMOTO ◽  
Hiroe YOSHIOKA ◽  
Kunihiko HASEGAWA
Keyword(s):  
Hydrogen Peroxide ◽  
Dna Damage ◽  
Low Concentration

scholarly journals The Preconditioning of Berberine Suppresses Hydrogen Peroxide-Induced Premature Senescence via Regulation of Sirtuin 1

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Xiaofei Zhu ◽  
Haodi Yue ◽  
Xiaofang Guo ◽  
Jingyi Yang ◽  
Jingshuo Liu ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Cellular Senescence ◽  
Sirtuin 1 ◽  
Premature Senescence ◽  
Low Concentration ◽  
Human Diploid Fibroblasts ◽  
Cycle Arrest ◽  
Age Related ◽  
History Of

With a long history of application in Chinese traditional medicine, berberine (BBR) was reported to exhibit healthspan-extending properties in some age-related diseases, such as type 2 diabetes and atherosclerosis. However, the antiaging mechanism of BBR is not completely clear. By means of hydrogen peroxide- (H2O2-) induced premature cellular senescence model, we found that a low-concentration preconditioning of BBR could resist premature senescence in human diploid fibroblasts (HDFs) measured by senescence-associated β-galactosidase (SA-β-gal), accompanied by a decrease in loss of mitochondrial membrane potential and production of intracellular reactive oxygen species (ROS). Moreover, the low-concentration preconditioning of BBR could make cells less susceptible to subsequent H2O2-induced cell cycle arrest and growth inhibition. Experimental results further showed that the low concentration of BBR could induce a slight increase of ROS and upregulate the expression level of sirtuin 1 (SIRT1), an important longevity regulator. H2O2-induced activation of checkpoint kinase 2 (Chk2) was significantly attenuated after the preconditioning of BBR. The present findings implied that the low-concentration preconditioning of BBR could have a mitohormetic effect against cellular senescence triggered by oxidative stress in some age-related diseases through the regulation of SIRT1.

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