Alcohols and ethanolamines as hydroxyl radical scavengers

Billany, M.R.; Khatib, K.; Gordon, Marsha; Sugden, J. K.

doi:10.1016/0378-5173(96)04246-9

Cited by 35 publications

(25 citation statements)

References 10 publications

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“…OH radicals, which are an intermediate of the water oxidation reaction. Alcohols are also known to act as radical scavengers . This justified a more precise investigation of the radicals forming during the photocatalytic process using different electron donors to identify the main culprit for the enzyme inactivation ( cf .…”

Section: Resultsmentioning

confidence: 99%

Photoenzymatic Hydroxylation of Ethylbenzene Catalyzed by Unspecific Peroxygenase: Origin of Enzyme Inactivation and the Impact of Light Intensity and Temperature

et al. 2019

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Photoenzymatic cascades can be used for selective oxygenation of C−H‐Bonds under mild conditions circumventing the hydrogen peroxide mediated peroxygenase inactivation via in situ H2O2 generation. Here, we report the “on demand” production of hydrogen peroxide via methanol assisted reduction of molecular oxygen using UV‐illuminated titanium dioxide (Aeroxide P25) combined with the enantioselective hydroxylation of ethylbenzene to (R)‐1‐phenylethanole catalyzed by the Unspecific Peroxygenase from Agrocybe Aegerita. For the application of the system it is important to understand the influence of the reaction parameters to be able to optimize the system. Therefore, we systematically investigated product formation and enzyme inactivation as well as ROS formation (H2O2, .OH and .O2−) applying different light intensities and temperatures. As a result, Turnover Numbers up to 220 000, photonic efficiencies up to 13.6 % and production rates up to 0.9 mM h−1 were achieved.

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Section: Resultsmentioning

confidence: 99%

Photoenzymatic Hydroxylation of Ethylbenzene Catalyzed by Unspecific Peroxygenase: Origin of Enzyme Inactivation and the Impact of Light Intensity and Temperature

et al. 2019

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“…• OH radicals (Billany et al 1996), antioxidant capacities can only be assessed using leaf extract made with water- (Foyer and Noctor 2011) and are expected to influence…”

Section: Discussionmentioning

confidence: 99%

Elevated ROS-scavenging enzymes contribute to acclimation to UV-B exposure in transplastomic tobacco plants, reducing the role of plastid peroxidases

Czégény

Martret

Pávkovics

et al. 2016

Journal of Plant Physiology

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Please cite this article as: Czégény Gyula, Martret Bénédicte Le, Pávkovics Dóra, Dix Philip J, HidegÉva.Elevated ROS-scavenging enzymes contribute to acclimation to UV-B exposure in transplastomic tobacco plants, reducing the role of plastid peroxidases.Journal of Plant Physiology http://dx.doi.org/10. 1016/j.jplph.2016.05.026 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. 1 JPLPH-D-16-00134 revised Title:Elevated ROS-scavenging enzymes contribute to acclimation to UV-B exposure in transplastomic tobacco plants, reducing the role of plastid peroxidases Authors:Gyula SummaryLeaf peroxidases play a key role in the successful acclimation of plants to low UV-B doses.The aim of the present study was to examine whether selective enhancement of alternative HTPA, hydroxyterephthalate; NBT, nitroblue tetrazolium; PAR, photosynthetically active radiation; PH, wild type 'Petit Havana' tobacco; POD, total peroxidase; SOD, superoxide dismutase; TPA, terephthalic acid; Trolox, 6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid); -UV, plants exposed to PAR and supplemental UV radiation; WT, wild type;PSII, light acclimated effective quantum yield of PSII

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“…• OH radicals scavengers such as: salicylic acid [7], diethanolamine [8], n-butanol [9] or using electron spin resonance (ESR) spectroscopy [10,11]. Yang et al [13] observed the formation of hydroxyl radicals during the reduction of molecular oxygen by Fe(II)-EDTA.…”

Section: Introductionmentioning

confidence: 99%

Influence of water temperature on the photocatalytic activity of titanium dioxide

Janus

Kusiak-Nejman

Morawski

2012

Reac Kinet Mech Cat

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In this study, it was shown that a possible explanation of increasing photocatalytic activity with temperature may be the fact that with increasing water temperature, the amount of hydroxyl radicals in water also increases, because the ionic product of water increases with an increase in temperature. For measurements of the amount of hydroxyl radicals, the fluorescence technique was used. Terephthalic acid was used as a hydroxyl radical scavenger. After inducing of TiO 2 , positive holes in the valance band may react with OH ions and produce• OH radicals, a strong oxidizing agent.

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Alcohols and ethanolamines as hydroxyl radical scavengers

Cited by 35 publications

References 10 publications

Photoenzymatic Hydroxylation of Ethylbenzene Catalyzed by Unspecific Peroxygenase: Origin of Enzyme Inactivation and the Impact of Light Intensity and Temperature

Photoenzymatic Hydroxylation of Ethylbenzene Catalyzed by Unspecific Peroxygenase: Origin of Enzyme Inactivation and the Impact of Light Intensity and Temperature

Elevated ROS-scavenging enzymes contribute to acclimation to UV-B exposure in transplastomic tobacco plants, reducing the role of plastid peroxidases

Influence of water temperature on the photocatalytic activity of titanium dioxide

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