Hydrogen peroxide evolution during V-UV photolysis of water

Azrague, Kamal; Bonnefille, Eric; Pradines, Vincent; Pimienta, Véronique; Oliveros, Esther; Maurette, Marie-Thérèse; Benoit-Marquié, Florence

doi:10.1039/b500162e

Cited by 63 publications

(42 citation statements)

References 19 publications

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“…Some of these applications concern photo-chemical treatment of water [Azrague K et al 2005, Gonzalez et al 2004, volatile organic compound (VOC) remediation [Biomorgi J et al 2005, Koutsospyros A et al 2004, biochemical decontamination and remediation of toxic gases [Herrman H W et al 1999], realisation of non-coherent vacuum ultraviolet (VUV: 100 nm < λ < 200 nm) or ultraviolet (UV: 200 nm < λ < 400 nm) sources [Kurunczi P et al 1999, Masoud N et al 2004, material deposition [Babayan S E et al 1998], H 2 generation for fuel cells and diesel reforming [Qiu H et al 2004, exhaust treatment [Dietz et al 2004] … As far as non-coherent radiation DBD sources are concerned, VUV sources are of topical interest for a variety of industrial purposes such as plasma processing [Kogelschatz U et al 1999], surface cleaning [Korfatis G et al 2002] and modification [Wagner H-E et al 2003, Borcia G et al 2003, sterilization, decontamination and medical care. Recently some emerging scientific investigations were performed in neon [Carman R J et al 2010].…”

Section: Introductionmentioning

confidence: 99%

Electric and spectroscopic analysis of a pure nitrogen mono-filamentary dielectric barrier discharge (MF-DBD) at 760 Torr

Sewraj¹,

Merbahi²,

Gardou³

et al. 2011

J. Phys. D: Appl. Phys.

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To cite this version:N Sewraj, N Merbahi, J P Gardou, P Rodriguez Akerreta, F Marchal. Electric and spectroscopic analysis of a pure nitrogen mono-filamentary dielectric barrier discharge (MF-DBD) at 760Torr. Journal of Physics D: Applied Physics, IOP Publishing, 2011, 44 (14) AbstractAs far as we know, VUV emissions of nitrogen MF-DBDs have never been reported before.Mono-filamentary dielectric barrier discharge (MF-DBD), occurring within 1-mm gap of atmospheric pressure pure nitrogen and operating with a sinusoidal electric supply at about 8 kHz, is studied in this paper.A thorough electrical analysis allows experimental determination of the ignition and extinction voltages,respectively (

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Section: Introductionmentioning

confidence: 99%

Electric and spectroscopic analysis of a pure nitrogen mono-filamentary dielectric barrier discharge (MF-DBD) at 760 Torr

Sewraj¹,

Merbahi²,

Gardou³

et al. 2011

J. Phys. D: Appl. Phys.

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“…The influence of water in the system is currently subject to further study. The generation of hydrogen peroxide by (V)UV photolysis of water has been described previously [18], and we would expect further ROS such as hydroxyl radicals to occur.…”

Section: The Plasma Source Usedmentioning

confidence: 99%

“…dest. Single-stranded oligomers were hybridized to form double-stranded oligomers by mixing equal amounts of dC 18 and dG 18 , heating them to 988C for 2 min, and hybridizing them by allowing them to cool to room temperature over 4 h. Aliquots of 20 ml were spotted on glass (maximum spot diameter 3 mm), dried and treated with the different jets for 30 min in He atmosphere. Controls were treated with He/O 2 gas.…”

Section: Raman Spectroscopymentioning

confidence: 99%

“…Confocal Raman spectroscopy was used to characterize the intramolecular bonds within single-stranded DNA oligomers consisting of 18 guanines. Raman spectra of dried dG 18 were taken after a 30 min treatment with the different jets. By comparing the spectra taken before plasma treatment, we identified a number of chemical modifications (figure 7a) that were assigned using annotations of structural peaks taken from references [32][33][34].…”

Section: Damage To Dnamentioning

confidence: 99%

“…Synthetic DNA oligomers (Thermo Fischer Scientific) consisting of 18 cytosines (dC 18 ) or guanines (dG 18 ) were set to a concentration of 1 mM in aq. dest.…”

Section: Raman Spectroscopymentioning

confidence: 99%

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Photons and particles emitted from cold atmospheric-pressure plasma inactivate bacteria and biomolecules independently and synergistically

Lackmann

Schneider

Edengeiser

et al. 2013

J. R. Soc. Interface.

154

133

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Cold atmospheric-pressure plasmas are currently in use in medicine as surgical tools and are being evaluated for new applications, including wound treatment and cosmetic care. The disinfecting properties of plasmas are of particular interest, given the threat of antibiotic resistance to modern medicine. Plasma effluents comprise (V)UV photons and various reactive particles, such as accelerated ions and radicals, that modify biomolecules; however, a full understanding of the molecular mechanisms that underlie plasma-based disinfection has been lacking. Here, we investigate the antibacterial mechanisms of plasma, including the separate, additive and synergistic effects of plasma-generated (V)UV photons and particles at the cellular and molecular levels. Using scanning electron microscopy, we show that plasma-emitted particles cause physical damage to the cell envelope, whereas UV radiation does not. The lethal effects of the plasma effluent exceed the zone of physical damage. We demonstrate that both plasma-generated particles and (V)UV photons modify DNA nucleobases. The particles also induce breaks in the DNA backbone. The plasma effluent, and particularly the plasma-generated particles, also rapidly inactivate proteins in the cellular milieu. Thus, in addition to physical damage to the cellular envelope, modifications to DNA and proteins contribute to the bactericidal properties of cold atmospheric-pressure plasma.

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A robust methodology for kinetic model parameter estimation for biocatalytic reactions

Al-Haque

Santacoloma

Neto

et al. 2012

Biotechnology Progress

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Effective estimation of parameters in biocatalytic reaction kinetic expressions are very important when building process models to enable evaluation of process technology options and alternative biocatalysts. The kinetic models used to describe enzyme-catalyzed reactions generally include several parameters, which are strongly correlated with each other. State-of-the-art methodologies such as nonlinear regression (using progress curves) or graphical analysis (using initial rate data, for example, the Lineweaver-Burke plot, Hanes plot or Dixon plot) often incorporate errors in the estimates and rarely lead to globally optimized parameter values. In this article, a robust methodology to estimate parameters for biocatalytic reaction kinetic expressions is proposed. The methodology determines the parameters in a systematic manner by exploiting the best features of several of the current approaches. The parameter estimation problem is decomposed into five hierarchical steps, where the solution of each of the steps becomes the input for the subsequent step to achieve the final model with the corresponding regressed parameters. The model is further used for validating its performance and determining the correlation of the parameters. The final model with the fitted parameters is able to describe both initial rate and dynamic experiments. Application of the methodology is illustrated with a case study using the ω-transaminase catalyzed synthesis of 1-phenylethylamine from acetophenone and 2-propylamine.

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Hydrogen peroxide evolution during V-UV photolysis of water

Abstract: Hydrogen peroxide evolution during the vacuum-ultraviolet (V-UV, 172 nm) photolysis of water is considerably affected by the presence of oxalic acid (employed as a model water pollutant) and striking differences are observed in the absence and in the presence of dioxygen.

Cited by 63 publications

References 19 publications

Electric and spectroscopic analysis of a pure nitrogen mono-filamentary dielectric barrier discharge (MF-DBD) at 760 Torr

Electric and spectroscopic analysis of a pure nitrogen mono-filamentary dielectric barrier discharge (MF-DBD) at 760 Torr

Photons and particles emitted from cold atmospheric-pressure plasma inactivate bacteria and biomolecules independently and synergistically

A robust methodology for kinetic model parameter estimation for biocatalytic reactions

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