Photochemical Estimation of Oxygen Solubility

Monroe, Bruce M.

doi:10.1111/j.1751-1097.1982.tb02660.x

Cited by 20 publications

(13 citation statements)

References 8 publications

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“…In fact, the solubility of oxygen in these solvents is very similar at room temperature. 44,45 Notice also that in our study, we avoided as much as possible exposing our samples to oxygen/air and light, in order to avoid the photo oxidation reactions, and we employed different solvent batches. However, water and oxygen is certainly present since our samples were prepared and processed in air.…”

Section: Discussionmentioning

confidence: 99%

Ionizing radiation induced degradation of poly (2-methoxy-5-(2’-ethyl-hexyloxy) -1,4-phenylene vinylene) in solution

Bronze‐Uhle

Batagin‐Neto

Lavarda

et al. 2011

Journal of Applied Physics

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In this paper we investigate the causes of the chromatic alteration observed in chloroform solutions of poly (2-methoxy-5-(2 0 -ethyl-hexyloxy)-1,4-phenylene vinylene) (MEH-PPV) after gamma ray irradiation. Structural and chemical changes were analyzed by gel permeation chromatography, fourier transform infrared spectroscopy, and proton nuclear magnetic resonance techniques and complemented by electronic structure calculations. The results indicate chlorine incorporation in the polymer structure and main chain scission after irradiation. Based on our findings we propose that the main mechanism for the blue-shifts, observed in the UV-Vis absorption spectra of MEH-PPV after irradiation, is the result of a radical attack on the polymer main chain. Gamma rays generate radicals, Cl andCHCl 2 from chloroform radiolysis that attack preferentially the vinyl double bonds of the polymer backbone, breaking the electronic conjugation and eventually the chain. Our results indicate that oxygen does not play a major role in the effect. Electronic spectra simulations were performed based on these assumptions reproducing the UV-Vis experimental results.

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Section: Discussionmentioning

confidence: 99%

Ionizing radiation induced degradation of poly (2-methoxy-5-(2’-ethyl-hexyloxy) -1,4-phenylene vinylene) in solution

Bronze‐Uhle

Batagin‐Neto

Lavarda

et al. 2011

Journal of Applied Physics

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“…It has been utilized in the preparation of light sensitive systems as photographic materials, polymer resists, and as photoinitiators in radical polymerization 1. Solution‐phase photochemistry of 1,2‐diketones, including BZ, has been reviewed2–5 in the presence and absence of molecular oxygen. When molecular oxygen is available, photo‐oxidation of BZ in benzene leads to phenyl benzoate, benzoic acid, biphenyl, and a small amount of benzoyl peroxide (BP) 6.…”

Section: Introductionmentioning

confidence: 99%

Antibacterial and biocompatible surfaces based on dopamine autooxidized silver nanoparticles

Sureshkumar

Siswanto

Chen

et al. 2012

J Polym Sci B Polym Phys

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A facile and green method is proposed to immobilize silver nanoparticles (AgNPs) showing antibacterial and biocompatible properties on surfaces of substrates. The adhesive and reductive polydopamine (Pdop) coating was applied on the substrates such as polyethylene, glass, poly(methyl methacrylate), and poly(lactic‐co‐glycolic acid) by simply dipping into dopamine solutions. AgNPs of 50–70 nm formed uniformly on the Pdop‐coated surfaces after immersing in silver nitrate solution where the density of AgNPs was modulated by Pdop immobilization time. Antibacterial efficacy, lactate dehydrogenase assay, and cell morphology observed by microscopy indicated that the as‐prepared AgNPs deposited on Pdop/substrates possessed effective biocidal properties and did not inhibit the growth of L‐929 cells mouse fibroblasts. The proposed method can be easily applied on different substrates and revealed good biocompatibility, which could be further developed for applications in biomaterials. © 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2013

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“…However, the opposite was found to be the case, the concentration of oxygen in CHCl 3 was higher than in air-saturated H 2 O. The concentration O 2 in air-equilibrated organic solvents such as CHCl 3 (2.05 mM), acetone (2.4 mM), acetonitrile (2.42 mM), or ethanol (1.94 mM) is about seven-fold higher than in air-equilibrated H 2 O (0.28 mM) [21,22,23,24,25,26,27]. Given the susceptibility of the autoxidation of the N-acetyl-lys-gly methyl ester dipeptide-derived isoLG pyrrole to catalysis, the stability of PE-isoLG pyrrole may be a consequence of the absence in CHCl 3 of catalytic impurities that promote its autoxidation, such as traces of redox active metal ions that are soluble in water but not chloroform.…”

Section: Discussionmentioning

confidence: 99%

The Adductomics of Isolevuglandins: Oxidation of IsoLG Pyrrole Intermediates Generates Pyrrole–Pyrrole Crosslinks and Lactams

Jang

Zhang

et al. 2019

High-Throughput

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Isoprostane endoperoxides generated by free radical-induced oxidation of arachidonates, and prostaglandin endoperoxides generated through enzymatic cyclooxygenation of arachidonate, rearrange nonenzymatically to isoprostanes and a family of stereo and structurally isomeric γ-ketoaldehyde seco-isoprostanes, collectively known as isolevuglandins (isoLGs). IsoLGs are stealthy toxins, and free isoLGs are not detected in vivo. Rather, covalent adducts are found to incorporate lysyl ε-amino residues of proteins or ethanolamino residues of phospholipids. In vitro studies have revealed that adduction occurs within seconds and is uniquely prone to cause protein–protein crosslinks. IsoLGs accelerate the formation of the type of amyloid beta oligomers that have been associated with neurotoxicity. Under air, isoLG-derived pyrroles generated initially are readily oxidized to lactams and undergo rapid oxidative coupling to pyrrole–pyrrole crosslinked dimers, and to more highly oxygenated derivatives of those dimers. We have now found that pure isoLG-derived pyrroles, which can be generated under anoxic conditions, do not readily undergo oxidative coupling. Rather, dimer formation only occurs after an induction period by an autocatalytic oxidative coupling. The stable free-radical TEMPO abolishes the induction period, catalyzing rapid oxidative coupling. The amine N-oxide TMAO is similarly effective in catalyzing the oxidative coupling of isoLG pyrroles. N-acetylcysteine abolishes the generation of pyrrole–pyrrole crosslinks. Instead pyrrole-cysteine adducts are produced. Two unified single-electron transfer mechanisms are proposed for crosslink and pyrrole-cysteine adduct formation from isoLG-pyrroles, as well as for their oxidation to lactams and hydroxylactams.

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Photochemical Estimation of Oxygen Solubility

Cited by 20 publications

References 8 publications

Ionizing radiation induced degradation of poly (2-methoxy-5-(2’-ethyl-hexyloxy) -1,4-phenylene vinylene) in solution

Ionizing radiation induced degradation of poly (2-methoxy-5-(2’-ethyl-hexyloxy) -1,4-phenylene vinylene) in solution

Antibacterial and biocompatible surfaces based on dopamine autooxidized silver nanoparticles

The Adductomics of Isolevuglandins: Oxidation of IsoLG Pyrrole Intermediates Generates Pyrrole–Pyrrole Crosslinks and Lactams

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