Generation and photosensitization properties of the oxidized radical of riboflavin: a laser flash photolysis study

Lu, Can‐Zhong; Wang, Wenfeng; Wang, Lin; Han, Zhewen; Yao, Side; Lin, Nianyun

doi:10.1016/s1011-1344(99)00111-6

Cited by 78 publications

(43 citation statements)

References 36 publications

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“…The shapes of the long-lived absorption, in the presence of In-der in a concentration able to quench ca. 95% 3 Rf Ã , are in good agreement with that of the semiquinone radical, RfH Å , previously reported [19] (reactions 4 and 5 and Fig. 2).…”

Section: Interaction Of In-der With Electronically Excited States Of Rfsupporting

confidence: 91%

On the generation and quenching of reactive-oxygen-species by aqueous vitamin B2 and serotonin under visible-light irradiation

Haggi

Blasich

Gutierrez

et al. 2012

Journal of Photochemistry and Photobiology B: Biology

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Section: Interaction Of In-der With Electronically Excited States Of Rfsupporting

confidence: 91%

On the generation and quenching of reactive-oxygen-species by aqueous vitamin B2 and serotonin under visible-light irradiation

Haggi

Blasich

Gutierrez

et al. 2012

Journal of Photochemistry and Photobiology B: Biology

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“…Indeed, direct photoejection of electrons from the singlet manifold of aqueous-phase riboflavin has been observed following application of 253.7 nm radiation. 47,48 Previous work has also established that ∼30% of the population excited into the S n manifold is irreversibly lost to this depletion channel. 3 Accordingly, such a population depletion induced by the IR pulse results in a decreased fluorescence signal from the S 1 state.…”

Section: Resultsmentioning

confidence: 98%

Resolution of strongly competitive product channels with optimal dynamic discrimination: Application to flavins

Roslund

Roth

Guyon

et al. 2011

The Journal of Chemical Physics

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Fundamental molecular selectivity limits are probed by exploiting laser-controlled quantum interferences for the creation of distinct spectral signatures in two flavin molecules, erstwhile nearly indistinguishable via steady-state methods. Optimal dynamic discrimination (ODD) uses optimally shaped laser fields to transiently amplify minute molecular variations that would otherwise go unnoticed with linear absorption and fluorescence techniques. ODD is experimentally demonstrated by combining an optimally shaped UV pump pulse with a time-delayed, fluorescence-depleting IR pulse for discrimination amongst riboflavin and flavin mononucleotide in aqueous solution, which are structurally and spectroscopically very similar. Closed-loop, adaptive pulse shaping discovers a set of UV pulses that induce disparate responses from the two flavins and allows for concomitant flavin discrimination of ∼16σ . Additionally, attainment of ODD permits quantitative, analytical detection of the individual constituents in a flavin mixture. The successful implementation of ODD on quantum systems of such high complexity bodes well for the future development of the field and the use of ODD techniques in a variety of demanding practical applications.

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“…It has been reported that singlet oxygen formation and free radical generation of riboflavin are competitive depending on the solubility and concentration of triplet oxygen (Edwards and Silva 2001). Riboflavin has about 1.7 V of reduction potential at pH 7, which is high enough to induce free radicals from food components through abstracting electron or hydrogen atom (Lu and others 1999). Excited‐state triplet riboflavin may generate free radicals of unsaturated fatty acids by abstracting hydrogen atom from carbon atom through type I pathway (Lu and others 1999; Choe and Min 2005).…”

Section: Resultsmentioning

confidence: 99%

Changes of Headspace Volatiles in Milk with Riboflavin Photosensitization

Lee¹,

Min²

2009

Journal of Food Science

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Effects of fluorescent light, riboflavin, ascorbic acid, sodium azide, and butylated hydroxyanisole (BHA) on the volatiles in milk at 4 degrees C were determined using a combination of headspace-solid phase microextraction (HS-SPME), gas chromatography (GC), and mass spectrometry (MS). Pentanal, hexanal, heptanal, and dimethyl disulfide were formed only in the milk stored under light and increased significantly as the duration of light exposure increased from 0 to 8 h and the concentration of added riboflavin increased from 5 to 50 ppm (P < 0.05). As fat content in milk increased, peak areas of pentanal, hexanal, and heptanal increased significantly (P < 0.05) while those of dimethyl disulfide did not change significantly (P > 0.05). Sodium azide prevented the formation of dimethyl disulfide in milk, implying that dimethyl disulfide can be formed through singlet oxygen oxidation (type II pathway). Addition of ascorbic acid and BHA reduced the formation of hexanal, heptanal, and dimethyl disulfide significantly (P < 0.05). Generation mechanisms of pentanal seem to be different from those of hexanal and heptanal in milk. Both singlet oxygen oxidation (type II pathway) and free radicals (type I pathway) play important roles in the formation of light-induced volatiles in milk.

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Generation and photosensitization properties of the oxidized radical of riboflavin: a laser flash photolysis study

Cited by 78 publications

References 36 publications

On the generation and quenching of reactive-oxygen-species by aqueous vitamin B2 and serotonin under visible-light irradiation

On the generation and quenching of reactive-oxygen-species by aqueous vitamin B2 and serotonin under visible-light irradiation

Resolution of strongly competitive product channels with optimal dynamic discrimination: Application to flavins

Changes of Headspace Volatiles in Milk with Riboflavin Photosensitization

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