Chemiluminescence arising from simultaneous transitions in pairs of singlet oxygen molecules

Khan, Ahsan U.; Kasha, Michael

doi:10.1021/ja00714a010

Cited by 341 publications

(169 citation statements)

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“…The 678-nm band may be because of peroxidic compounds produced from the peroxyl radicals, as already explained for NR and CR. Another possibility for the assignment of the 678-nm band is dimol singlet oxygen, which is well known to give strong emission around 650 nm, 24 but we have no evidence. …”

Section: Thermal Luminescence Spectroscopy Of Elastomers T Hironiwa Econtrasting

confidence: 55%

“…23 One may claim that the double bonds in the main-chain structure of CR were thermally oxidized to yield the carbon radicals. 24 If this is true, NR, which has double bonds in the main-chain structure like CR, should show CL emission when it is heated in air before g-ray irradiation. However, we observed no CL emission from NR when it was heated in air before g-ray irradiation, as shown in the right of Figure 2a.…”

Section: Thermal Luminescence Spectroscopy Of Elastomers T Hironiwa Ementioning

confidence: 99%

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Thermal luminescence spectroscopy of γ-irradiated elastomers using a multichannel Fourier-transform chemiluminescence spectrometer

Hironiwa

Yamada

Ishii³

et al. 2012

Polym J

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Chemiluminescence spectra of natural rubber, chloroprene rubber and ethylene propylene diene rubber were measured in N 2 and in air with a multichannel Fourier-transform chemiluminescence spectrometer. Samples were measured after c-ray irradiation in air and in the absence of O 2 . No strong emission was observed for natural rubber heated in N 2 after the sample was c-irradiated in the absence of O 2 , but a strong emission from the sample was observed at 631 nm in air. An emission from chloroprene rubber was observed around 659 nm even when the sample was not c-irradiated. A similar band was observed after the sample was c-irradiated in air and in the absence of O 2 . A strong emission from ethylene propylene diene rubber was observed in air only when the sample was c-irradiated in air. The observed spectrum was separated into two bands at 678 and 523 nm, where the former and the latter were tentatively assigned to peroxidic compounds and excited carbonyl groups, respectively. The relative intensity of the two bands changed during the measurement. It is concluded that luminescence spectroscopy using a multichannel spectrometer is a powerful technique to examine the oxidative degradation of elastomers.

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Section: Thermal Luminescence Spectroscopy Of Elastomers T Hironiwa Econtrasting

confidence: 55%

Section: Thermal Luminescence Spectroscopy Of Elastomers T Hironiwa Ementioning

confidence: 99%

Thermal luminescence spectroscopy of γ-irradiated elastomers using a multichannel Fourier-transform chemiluminescence spectrometer

Hironiwa

Yamada

Ishii³

et al. 2012

Polym J

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“…Vibrational transitions of various 1 O 2 pairs lead to UPE emission with spectral peaks at approximately 470-480, 510-530, 560-580, 630-640, and 670 nm (Nakano et al, 1976). Another peak is at 703 nm (Khan and Kasha, 1970) and approximately 1270 nm (Baker and Kanofsky, 1991 In addition, as mentioned, glutamate has a significant function in thermoregulation by means of the NMDA ionotropic receptors (Yoshimatsu et al, 1993;Paro et al, 2003), and there is a significant association between temperature and glutamate excitotoxicity (Campos et al, 2012). Thus, glutamate-related phosphene induction through UPE may also be a possible mechanism relating fever (high body temperature) and phosphenes (Cervetto et al, 2007).…”

Section: Glutamate Triggered Upe and Phosphenesmentioning

confidence: 94%

Phosphene perception is due to the ultra-weak photon emission produced in various parts of the visual system: glutamate in the focus

Császár¹,

Scholkmann²,

Salari³

et al. 2016

Reviews in the Neurosciences

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AbstractPhosphenes are experienced sensations of light, when there is no light causing them. The physiological processes underlying this phenomenon are still not well understood. Previously, we proposed a novel biopsychophysical approach concerning the cause of phosphenes based on the assumption that cellular endogenous ultra-weak photon emission (UPE) is the biophysical cause leading to the sensation of phosphenes. Briefly summarized, the visual sensation of light (phosphenes) is likely to be due to the inherent perception of UPE of cells in the visual system. If the intensity of spontaneous or induced photon emission of cells in the visual system exceeds a distinct threshold, it is hypothesized that it can become a conscious light sensation. Discussing several new and previous experiments, we point out that the UPE theory of phosphenes should be really considered as a scientifically appropriate and provable mechanism to explain the physiological basis of phosphenes. In the present paper, we also present our idea that some experiments may support that the cortical phosphene lights are due to the glutamate-related excess UPE in the occipital cortex.

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“…4) (28)(29)(30). However, little is known about the reaction of HOCl with other biologically relevant hydroperoxides, such as lipid hydroperoxides, which are the primary products of lipid peroxidation and are also generated in lipoxygenase-and ciclooxygenase-catalyzed reactions (31).…”

mentioning

confidence: 99%

“…The reaction mechanism was investigated by measuring the formation of 18 (Fig. 1 A) (28)(29)(30). Similarly, the injection of HOCl (final concentration, 1 mM) into a solution of LAOOH (1 mM solubilized in 0.1 M phosphate buffer, pH 7.4, in D 2 O) also produced a rapid increase in light emission whose intensity was Ϸ30 times lower compared with the reaction with H 2 O 2 (Fig.…”

mentioning

confidence: 99%

Linoleic acid hydroperoxide reacts with hypochlorous acid, generating peroxyl radical intermediates and singlet molecular oxygen

Miyamoto

Martinez²,

Rettori³

et al. 2005

Proc. Natl. Acad. Sci. U.S.A.

124

108

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The reaction of hypochlorous acid (HOCl) with hydrogen peroxide is known to generate stoichiometric amounts of singlet molecular oxygen [O2 ( 1 ⌬g)]. This study shows that HOCl can also react with linoleic acid hydroperoxide (LAOOH), generating O2 ( 1 ⌬g) with a yield of 13 ؎ 2% at physiological pH. Characteristic light emission at 1,270 nm, corresponding to O2 ( 1 ⌬g) monomolecular decay, was observed when HOCl was reacted with LAOOH or with liposomes containing phosphatidylcholine hydroperoxides, but not with cumene hydroperoxide or tert-butyl hydroperoxide. The generation of O2 ( 1 ⌬g lipid hydroperoxides ͉ mass spectrometry ͉ myeloperoxidase ͉ near-infrared emission ͉ 18 O-labeled oxygen

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Chemiluminescence arising from simultaneous transitions in pairs of singlet oxygen molecules

Cited by 341 publications

References 1 publication

Thermal luminescence spectroscopy of γ-irradiated elastomers using a multichannel Fourier-transform chemiluminescence spectrometer

Thermal luminescence spectroscopy of γ-irradiated elastomers using a multichannel Fourier-transform chemiluminescence spectrometer

Phosphene perception is due to the ultra-weak photon emission produced in various parts of the visual system: glutamate in the focus

Linoleic acid hydroperoxide reacts with hypochlorous acid, generating peroxyl radical intermediates and singlet molecular oxygen

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