Reduction of oxygen by hydroxylammonium salt or hydroxylamine over supported Au nanoparticles for in situ generation of hydrogen peroxide in aqueous or non-aqueous medium

2007 ◽  
Vol 8 (5) ◽  
pp. 811-816 ◽  
Author(s):  
Vasant R. Choudhary ◽  
Prabhas Jana ◽  
Suresh K. Bhargava
Keyword(s):  
Hydrogen Peroxide ◽  
Aqueous Medium ◽  
Au Nanoparticles ◽  
In Situ Generation

In-situ generation of Au nanoparticles in poly(methyl methacrylate) films via MeV proton irradiation

2021 ◽  
pp. 125205
Author(s):  
Oleksandr Romanenko ◽  
Petr Slepička ◽  
Ondřej Kvítek ◽  
Miroslav Šlouf ◽  
Pavel Němecek ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Au Nanoparticles ◽  
Proton Irradiation ◽  
Poly Methyl Methacrylate ◽  
In Situ Generation

scholarly journals Multienzymatic in situ hydrogen peroxide generation cascade for peroxygenase-catalysed oxyfunctionalisation reactions

2019 ◽  
Vol 74 (3-4) ◽  
pp. 101-104 ◽  
Author(s):  
Milja Pesic ◽  
Sébastien Jean-Paul Willot ◽  
Elena Fernández-Fueyo ◽  
Florian Tieves ◽  
Miguel Alcalde ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Formate Dehydrogenase ◽  
Flavin Mononucleotide ◽  
Candida Boidinii ◽  
Reaction Parameters ◽  
Old Yellow Enzyme ◽  
Hydroxylation Reaction ◽  
In Situ Generation ◽  
Hydrogen Peroxide Generation

Abstract There is an increasing interest in the application of peroxygenases in biocatalysis, because of their ability to catalyse the oxyfunctionalisation reaction in a stereoselective fashion and with high catalytic efficiencies, while using hydrogen peroxide or organic peroxides as oxidant. However, enzymes belonging to this class exhibit a very low stability in the presence of peroxides. With the aim of bypassing this fast and irreversible inactivation, we study the use of a gradual supply of hydrogen peroxide to maintain its concentration at stoichiometric levels. In this contribution, we report a multienzymatic cascade for in situ generation of hydrogen peroxide. In the first step, in the presence of NAD+ cofactor, formate dehydrogenase from Candida boidinii (FDH) catalysed the oxidation of formate yielding CO2. Reduced NADH was reoxidised by the reduction of the flavin mononucleotide cofactor bound to an old yellow enzyme homologue from Bacillus subtilis (YqjM), which subsequently reacts with molecular oxygen yielding hydrogen peroxide. Finally, this system was coupled to the hydroxylation of ethylbenzene reaction catalysed by an evolved peroxygenase from Agrocybe aegerita (rAaeUPO). Additionally, we studied the influence of different reaction parameters on the performance of the cascade with the aim of improving the turnover of the hydroxylation reaction.

Pyrenediones as versatile photocatalysts for oxygenation reactions with in situ generation of hydrogen peroxide under visible light

2020 ◽  
Vol 22 (1) ◽  
pp. 22-27 ◽  
Author(s):  
Yuannian Zhang ◽  
Xin Yang ◽  
Haidi Tang ◽  
Dong Liang ◽  
Jie Wu ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Oxidation Of Sulfides ◽  
In Situ Generation

Pyrenediones (PYDs) are efficient photocatalysts for three oxygenation reactions: epoxidation of electron deficient olefins, oxidative hydroxylation of organoborons and oxidation of sulfides via in situ generation of H2O2 from O2 under visible light irradiation.

scholarly journals Rapid and Efficient Arsenic Removal by Iron Electrocoagulation Enabled with in Situ Generation of Hydrogen Peroxide

2020 ◽  
Vol 54 (10) ◽  
pp. 6094-6103
Author(s):  
Siva R. S. Bandaru ◽  
Case M. van Genuchten ◽  
Arkadeep Kumar ◽  
Sara Glade ◽  
Dana Hernandez ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Arsenic Removal ◽  
In Situ Generation
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