Dioxygen Reduction to Hydrogen Peroxide by a Molecular Mn Complex: Mechanistic Divergence between Homogeneous and Heterogeneous Reductants

2019 ◽  
Vol 141 (10) ◽  
pp. 4379-4387 ◽  
Author(s):  
Shelby L. Hooe ◽  
Charles W. Machan
Keyword(s):  
Hydrogen Peroxide ◽  
Dioxygen Reduction

Efficient hydrogen peroxide synthesis by metal-free polyterthiophene via photoelectrocatalytic dioxygen reduction

2020 ◽  
Vol 13 (1) ◽  
pp. 238-245 ◽  
Author(s):  
Wenjun Fan ◽  
Bingqing Zhang ◽  
Xiaoyu Wang ◽  
Weiguang Ma ◽  
Deng Li ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Oxygen Reduction ◽  
Cost Effective ◽  
High Concentration ◽  
Metal Free ◽  
Dioxygen Reduction ◽  
Polymeric Semiconductor ◽  
Hydrogen Peroxide Synthesis

We demonstrate the metal-free polymeric semiconductor pTTh as a selective and efficient photocathode for photoelectrochemical oxygen reduction to a high concentration of H2O2 in a cost-effective way.

Reduction of dioxygen to water by a Co(N2O2) complex with a 2,2′-bipyridine backbone

2021 ◽  
Author(s):  
Asa W. Nichols ◽  
Joseph S. Kuehner ◽  
Brittany L. Huffman ◽  
Peter R. Miedaner ◽  
Diane A. Dickie ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Intrinsic Activity ◽  
Dioxygen Reduction

The first Co(N2O2)-based catalyst with intrinsic activity for dioxygen reduction to water instead of hydrogen peroxide is reported.

The Mechanism of Dioxygen Reduction at Iron meso-Tetrakis (Pyridyl) Porphyrin: a Spectroelectrochemical Study

1998 ◽  
Vol 02 (03) ◽  
pp. 249-260 ◽  
Author(s):  
S. POPOVICI ◽  
W. LEYFFER ◽  
R. HOLZE
Keyword(s):  
Hydrogen Peroxide ◽  
Cyclic Voltammetry ◽  
Strong Influence ◽  
Resonance Raman ◽  
Reduction Reaction ◽  
Reduction Product ◽  
Dioxygen Reduction ◽  
Primary Reduction

The mechanism of the dioxygen interaction with and reduction reaction at iron α,β,γ,δ-tetra(4-pyridyl) porphyrin ( FeTPyP ) deposited on carbon and silver supporting electrodes was investigated with cyclic voltammetry and FTIR, UV-vis and resonance Raman spectroscopies. Results indicate a strong influence of the ligand upon the reduction electrocatalysis. Spectroelectrochemical results support a two-electron pathway resulting most probably in hydrogen peroxide as the primary reduction product.

Introduction of Secondary Ligand in Titanium-Based Metal-Organic Frameworks for Visible-Light-Driven Photocatalytic Hydrogen Peroxide Production from Dioxygen Reduction

2021 ◽  
Author(s):  
Xiaolang Chen ◽  
Yasutaka Kuwahara ◽  
Kohsuke Mori ◽  
Catherine Louis ◽  
Hiromi Yamashita
Keyword(s):  
Hydrogen Peroxide ◽  
Visible Light ◽  
Catalytic Properties ◽  
Metal Organic Frameworks ◽  
Hydrogen Peroxide Production ◽  
Multiple Components ◽  
Dioxygen Reduction ◽  
Visible Light Driven ◽  
Metal Organic ◽  
Secondary Ligand

Introduction of multiple components with specific properties in metal–organic frameworks (MOFs) is an attractive strategy to modify their catalytic properties. Herein, through the introduction of ligand 4,4’,4’’,4’’’-(pyrene-1,3,6,8-tetrayl)tetrabenzoic acid (L2) in...

Peroxidase Localization in Hartmanella Trophozoites

1971 ◽  
Vol 29 ◽  
pp. 346-347 ◽  
Author(s):  
George E. Childs ◽  
Joseph H. Miller
Keyword(s):  
Hydrogen Peroxide ◽  
Ultrastructural Localization ◽  
Pathogenic Strain ◽  
Oxidative Enzymes ◽  
Differential Centrifugation ◽  
Electron Microscopic ◽  
Microscopic Studies ◽  
The Subject ◽  
Axenic Cultures

Biochemical and differential centrifugation studies have demonstrated that the oxidative enzymes of Acanthamoeba sp. are localized in mitochondria and peroxisomes (microbodies). Although hartmanellid amoebae have been the subject of several electron microscopic studies, peroxisomes have not been described from these organisms or other protozoa. Cytochemical tests employing diaminobenzidine-tetra HCl (DAB) and hydrogen peroxide were used for the ultrastructural localization of peroxidases of trophozoites of Hartmanella sp. (A-l, Culbertson), a pathogenic strain grown in axenic cultures of trypticase soy broth.

Fluorescent proteins for in vivo imaging, where's the biliverdin?

2020 ◽  
Vol 48 (6) ◽  
pp. 2657-2667
Author(s):  
Felipe Montecinos-Franjola ◽  
John Y. Lin ◽  
Erik A. Rodriguez
Keyword(s):  
Hydrogen Peroxide ◽  
In Vivo Imaging ◽  
Near Infrared ◽  
Fluorescent Protein ◽  
Fluorescent Proteins ◽  
Fluorescent Imaging ◽  
Infrared Light ◽  
Red Fluorescent Protein ◽  
Color Palette

Noninvasive fluorescent imaging requires far-red and near-infrared fluorescent proteins for deeper imaging. Near-infrared light penetrates biological tissue with blood vessels due to low absorbance, scattering, and reflection of light and has a greater signal-to-noise due to less autofluorescence. Far-red and near-infrared fluorescent proteins absorb light >600 nm to expand the color palette for imaging multiple biosensors and noninvasive in vivo imaging. The ideal fluorescent proteins are bright, photobleach minimally, express well in the desired cells, do not oligomerize, and generate or incorporate exogenous fluorophores efficiently. Coral-derived red fluorescent proteins require oxygen for fluorophore formation and release two hydrogen peroxide molecules. New fluorescent proteins based on phytochrome and phycobiliproteins use biliverdin IXα as fluorophores, do not require oxygen for maturation to image anaerobic organisms and tumor core, and do not generate hydrogen peroxide. The small Ultra-Red Fluorescent Protein (smURFP) was evolved from a cyanobacterial phycobiliprotein to covalently attach biliverdin as an exogenous fluorophore. The small Ultra-Red Fluorescent Protein is biophysically as bright as the enhanced green fluorescent protein, is exceptionally photostable, used for biosensor development, and visible in living mice. Novel applications of smURFP include in vitro protein diagnostics with attomolar (10−18 M) sensitivity, encapsulation in viral particles, and fluorescent protein nanoparticles. However, the availability of biliverdin limits the fluorescence of biliverdin-attaching fluorescent proteins; hence, extra biliverdin is needed to enhance brightness. New methods for improved biliverdin bioavailability are necessary to develop improved bright far-red and near-infrared fluorescent proteins for noninvasive imaging in vivo.

Protective effect of chitooligosaccharides on hydrogen peroxide-induced PC-12 cells death by inhibition of oxidative damage

2010 ◽  
Vol 34 (8) ◽  
pp. S27-S27
Author(s):  
Xueling Dai ◽  
Ping Chang ◽  
Ke Xu ◽  
Changjun Lin ◽  
Hanchang Huang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Oxidative Damage ◽  
Protective Effect ◽  
Pc 12 Cells ◽  
Cells Death
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