Diurnal changes of singlet oxygen like oxidants concentration in polluted ambient air

Ogawa, Shunjiro; Shimazaki, Ryosuke; Soejima, Akiko; Takamure, Eiko; Hanasaki, Yukiko; Fukui, Shozo

doi:10.1016/0045-6535(96)00075-6

Cited by 6 publications

(6 citation statements)

References 5 publications

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“… 25 Many researchers have pointed out that 1 O 2 is an important oxidizing agent present in ambient polluted air. 26 − 28 Since the transition from the 1 Δ g state to the 3 E g – state is spin forbidden, the 1 Δ g O 2 is considerably long-lived. It had been confirmed that the radiative lifetime of O 2 ( 1 Δ g ) is 45 min in the gas phase 29 and 10 –6 - 10 –3 s in solution.…”

Section: Resultsmentioning

confidence: 99%

“…It has been strongly suggested that singlet oxygen ( 1 O 2 ) was formed by photosensitization in the atmosphere and may play a significant role as an oxidant in the air . Many researchers have pointed out that 1 O 2 is an important oxidizing agent present in ambient polluted air. − Since the transition from the 1 Δ g state to the 3 E g – state is spin forbidden, the 1 Δ g O 2 is considerably long-lived. It had been confirmed that the radiative lifetime of O 2 ( 1 Δ g ) is 45 min in the gas phase and 10 –6 - 10 –3 s in solution .…”

Section: Resultsmentioning

confidence: 99%

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Surface Oxidation under Ambient Air—Not Only a Fast and Economical Method to Identify Double Bond Positions in Unsaturated Lipids But Also a Reminder of Proper Lipid Processing

et al. 2014

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A simple, fast approach elucidated carbon–carbon double bond positions in unsaturated lipids. Lipids were deposited onto various surfaces and the products from their oxidation in ambient air were observed by electrospray ionization (ESI) mass spectrometry (MS). The most common oxidative products, aldehydes, were detected as transformations at the cleaved double bond positions. Ozonides and carboxylic acids were generated in certain lipids. Investigations of the conditions controlling the appearance of these products indicated that the surface oxidation depends on light and ambient air. Since the lipid oxidation was slower in a high concentration of ozone, singlet oxygen appeared to be a parallel oxidant for unsaturated lipids. The 3-hydroxyl group in the sphingoid base of sulfatides offered some protection from oxidation for the Δ4,5-double bond, slowing its oxidation rate relative to that of the isolated double bond in the N-linked fatty acyl chain. Direct sampling by thin-layer chromatography (TLC)-ESI-MS provides a powerful approach to elucidate detailed structural information on biological samples. Co-localization of the starting lipids and their oxidation products after TLC separation allowed assignment of the native unsaturation sites. Phosphatidylserine and N,N-dimethyl phosphatidylethanolamine isomers in a bovine brain total lipid extract were distinguished on the basis of their oxidation products. Meanwhile, the findings reported herein reveal a potential pitfall in the assignment of structures to lipids extracted from TLC plates because of artifactual oxidation after the plate development.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Surface Oxidation under Ambient Air—Not Only a Fast and Economical Method to Identify Double Bond Positions in Unsaturated Lipids But Also a Reminder of Proper Lipid Processing

et al. 2014

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“…Moreover, a small part of dioxygen in the air is not at ground state ( 3 O2, O=O), but at the excited state ( 1 O2, • O-O • ) due to air pollution and sun light (Wayne, 1994). The 1 O2 content in the atmosphere depends on the weather (Ogawa et al, 1996). Hydroxy radicals HO • in urban air were also quantified (Alaghmand & Blough, 2007).…”

Section: Cds As Reference Methodsmentioning

confidence: 99%

Fast and direct analysis of oxidation levels of oil-in-water emulsions using ATR-FTIR

et al. 2019

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 Attenuated total reflection-Fourier transform infrared (ATR-FTIR) monitors lipid oxidation in oil-in-water (o/w) emulsions without lipid extraction  Correlate spectral changes to conjugated diene values using partial least squares regression (PLSR) models  Fast extraction of lipids to measure oxidation using peroxide value (PV), conjugated diene (CD) value, and thiobarbituric acid reactive substances (TBARs) in oil-in-water emulsions

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“…Let us emphasize that the kinetics of the outlined elementary reactions, besides the immense relevance for plasma- and laser-stimulated chemical processes, ,,,,,, is also important for refining the kinetic models of shock-induced air plasma ,,− , and atmospheric chemistry. ,,,,, As well, it is likely that the careful study of these processes could shed light on the reasons for the above-mentioned discrepancy between theory and experiment concerning the reaction . Of considerable interest for the applications alluded to is also the nascent energy distribution in reaction products (the way the chemical energy released is partitioned into the different product degrees of freedom, viz.…”

Section: Introductionmentioning

confidence: 99%

Reaction of the N Atom with Electronically Excited O₂ Revisited: A Theoretical Study

2021

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The kinetics of the reaction of N with electronically excited O 2 (singlet a 1 Δ g and b 1 Σ g + states), potentially relevant for NO x formation in nonthermal air plasma, is theoretically studied using the multireference second-order perturbation theory. The corresponding thermodynamically and kinetically favored reaction pathways together with possible intersystem crossings are identified. It has been revealed that the energy barrier for the N + O 2 (a 1 Δ g ) → NO + O reaction is approximately twice the barrier height for the counterpart process with O 2 (X 3 Σ g − ). The molecular oxygen in the b 1 Σ g + state, in turn, proved to be even less reactive to atomic nitrogen than O 2 (a 1 Δ g ). Appropriate thermal rate constants for specified reaction channels are calculated by the variational transition-state theory incorporating corrections for the tunneling effect, nonadiabatic transitions, and anharmonicity of vibrations for transition states and reactants. The corresponding threeparameter Arrhenius expressions for the broad temperature range (T = 300−4000 K) are reported. At last, post-transition-state molecular dynamics simulations indicate that the N + O 2 (a 1 Δ g ) reaction produces vibrationally much colder NO molecules than the N + O 2 (X 3 Σ g − ) process.

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Diurnal changes of singlet oxygen like oxidants concentration in polluted ambient air

Cited by 6 publications

References 5 publications

Surface Oxidation under Ambient Air—Not Only a Fast and Economical Method to Identify Double Bond Positions in Unsaturated Lipids But Also a Reminder of Proper Lipid Processing

Surface Oxidation under Ambient Air—Not Only a Fast and Economical Method to Identify Double Bond Positions in Unsaturated Lipids But Also a Reminder of Proper Lipid Processing

Fast and direct analysis of oxidation levels of oil-in-water emulsions using ATR-FTIR

Reaction of the N Atom with Electronically Excited O₂ Revisited: A Theoretical Study

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Diurnal changes of singlet oxygen like oxidants concentration in polluted ambient air

Cited by 6 publications

References 5 publications

Surface Oxidation under Ambient Air—Not Only a Fast and Economical Method to Identify Double Bond Positions in Unsaturated Lipids But Also a Reminder of Proper Lipid Processing

Surface Oxidation under Ambient Air—Not Only a Fast and Economical Method to Identify Double Bond Positions in Unsaturated Lipids But Also a Reminder of Proper Lipid Processing

Fast and direct analysis of oxidation levels of oil-in-water emulsions using ATR-FTIR

Reaction of the N Atom with Electronically Excited O2 Revisited: A Theoretical Study

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Reaction of the N Atom with Electronically Excited O₂ Revisited: A Theoretical Study