Oxidation of nicotinamide adenine dinucleotide by hydroperoxyl radical.  A flash photolysis study

This study throws light on utilization of visible light in removal dyes from wastewater using commercial PbCrO 4 /TiO 2 (P-25) composite which was prepared by grinding TiO 2 (P-25) with PbCrO 4 to decrease the adhesion properties of PbCrO 4 . As-prepared catalyst was characterized by DRS, XRD and N 2 adsorption-desorption. The morphology was examined by SEM. The photodegradation of rhodamine B (Rh B) product in the presence of PbCrO 4 / TiO 2 (P-25) composite was dependent on the pH of the medium. In 2 \ pH \ 10, Rh B was involved in photodegradation via N-deethylation terminated at rhodamine 110 while at pH = 2 rhodamine 110 underwent chromophore destruction. Obtained data showed that HO 2• /O 2•-species were involved in degradation of dye. Commercial PbCrO 4 /TiO 2 (P-25) composite is considered as good visible light-sensitive photocatalyst for removing Rh B.

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“…•-in acidic medium [30] and it has high redox (?1.44 V vs. NHE) in comparison with redox potential of O 2…”

Section: Radical Scavengermentioning

confidence: 99%

Investigation of commercial PbCrO4/TiO2 for photodegradation of rhodamine B in aqueous solution by visible light

Abou-Gamra

Ahmed

Hamza

2017

Nanotechnol. Environ. Eng.

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“…H02 + NADH -*H202 + NAD - (32) k(32) = 1.8 x 105 M -1 -s-1 has been obtained, considerably lower than the rate constant observed here (Nadezhidin & Dunford, 1979). Hydrogen-atom abstraction by the penicillamine thiyl radical has also been observed by pulse radiolysis:…”

Section: Gs + Nadh --Gs-+ Nadh + (25)mentioning

confidence: 82%

Thiyl and phenoxyl free radicals and NADH Direct observation of one-electron oxidation

Forni¹,

Willson²

1986

Biochemical Journal

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Absolute rate constants for the reaction of NADH with thiyl free radicals derived from various sulphurcontaining compounds of biological significance were measured by using the technique of pulse radiolysis. These and related reactions with phenoxyl free radicals are believed to occur through one-electron-transfer processes. Further evidence comes from studies with deuterated NADH. The results support the possibility that, in biochemical systems, thiols may act as catalysts linking hydrogen-atom and electron-transfer reactions.

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“…1, with a rate constant, k = 1.7 x 10 7 dm 3 mol -1 s -1 . 38 The photooxidative quenching of flavin triplets by reductant (e.g. EDTA, ascorbic acid)…”

Section: [A] Photochemical Productionmentioning

confidence: 99%

Quinones as photosensitizer for photodynamic therapy: ROS generation, mechanism and detection methods

Rajendran¹

2016

Photodiagnosis and Photodynamic Therapy

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Oxidation of nicotinamide adenine dinucleotide by hydroperoxyl radical. A flash photolysis study

Cited by 47 publications

References 6 publications

Investigation of commercial PbCrO4/TiO2 for photodegradation of rhodamine B in aqueous solution by visible light

Investigation of commercial PbCrO4/TiO2 for photodegradation of rhodamine B in aqueous solution by visible light

Thiyl and phenoxyl free radicals and NADH Direct observation of one-electron oxidation

Quinones as photosensitizer for photodynamic therapy: ROS generation, mechanism and detection methods

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