PHOTO-INDUCED BINDING OF FLUORESCEIN DYES TO ZINC OXIDE<sup>1</sup>

Oster, Gérald; Wasserman, M. M.

doi:10.1021/j100814a503

Cited by 5 publications

(4 citation statements)

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“…Photobinding between riboflavin and other molecules has been described by Oster and Wasserman (1962) and by Kostenbauder and De Lucca (1963). Also, McKnight and Spikes (1970a, b) and McKnight (1970McKnight ( , 1972 showed the existence of photobinding between RNase and flavins.…”

Section: 29mentioning

confidence: 94%

Light-induced binding of riboflavin to lysozyme

Silva

Gaule

1977

Radiat Environ Biophys

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The photodynamic inactivation of lysozyme in air saturated H2O and D2O (phosphate buffer 0.05 M, pH 7.0) in the presence of methylene blue and riboflavin has been studied. When H2O was replaced by D2O a great increase in the rate of photoinactivation of lysozyme was observed. This finding, together with the fact that photooxidation is inhibited by singlet oxygen quenchers like NaN3, suggests that these reactions occur via a singlet oxygen mechanism. During the course of the studies of the riboflavin sensitized photoinactivation of lysozyme, it was found that riboflavin is strongly bound to the enzyme as a result of illumination. This finding would explain the higher quantum yield observed when riboflavin is used, although this dye is bleached during irradiation.

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Section: 29mentioning

confidence: 94%

Light-induced binding of riboflavin to lysozyme

Silva

Gaule

1977

Radiat Environ Biophys

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“…However, the introduction of a large roughness factor is unlikely. Furthermore, the assumption of a photoadsorption (26) cannot remove this large discrepancy. Oster and Wassermann (26) have found, indeed, a photoadsorption of Fluorescein and of its halogenated derivatives on powdered zinc oxide.…”

Section: Conclusion and Final Remarksmentioning

confidence: 99%

“…Furthermore, the assumption of a photoadsorption (26) cannot remove this large discrepancy. Oster and Wassermann (26) have found, indeed, a photoadsorption of Fluorescein and of its halogenated derivatives on powdered zinc oxide. The speed of adsorption, however, was rather slow in contrast to our sensitization kinetic experiments.…”

Section: Conclusion and Final Remarksmentioning

confidence: 99%

New Experiments on the Sensitization of Zinc Oxide by Means of the Electrochemical Cell Technique

Häuffe

Danzmann

Pusch

et al. 1970

J. Electrochem. Soc.

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The “formal quantum yield” of the sensitization of the anodic photocurrent of zinc oxide by Rhodamine B has been determined by means of an electrochemical cell technique. Zinc oxide was used as a single crystal in the electrochemical cell +normalIndium|normalZnO crystal|normalElectrolyte+normalDye|normalPlatinum− in aqueous and methanol electrolytes. Simultaneously, the adsorption of the dye on zinc oxide powder has been measured. The influence of the solvent on the extent of the adsorption is significant. The important role of the cosensitizer on the sensitizing ability of the dye is discussed.

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“…At very low oxygen concentrations, the RB triplet excited state accepts an electron from suitable donors, including RB ground state, to generate a semi-reduced and a semi-oxidized RB radical (23,24). Subsequent reactions generate fluorescein derivatives with fewer halogen substituents that absorb at shorter wavelengths (25).…”

Section: Introductionmentioning

confidence: 99%

Nanocaging Rose Bengal to Inhibit Aggregation and Enhance Photo‐induced Oxygen Consumption^†

Alvarez-López

Cavazos‐Elizondo

Heyne

et al. 2022

Photochem & Photobiology

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Photosensitized crosslinking of proteins in tissues has many medical applications including sealing wounds, strengthening tissues, and beneficially altering tissue properties. Rose Bengal (RB) is used most frequently as the photosensitizer but is not as efficient as would be desired for broad utilization in medicine. Aggregation of RB, at the high concentrations used for medical treatments, decreases the yield of singlet oxygen, which mediates protein crosslinking. We hypothesized that nanocages that sequester RB would inhibit self-association, increasing photosensitization efficiency. We tested cucurbituril and cyclodextrin nanocages, demonstrating that hydroxypropyl-functionalized cyclodextrins are most effective in inhibiting RB aggregation. For these RB/cyclodextrin solutions, we investigated the effect of nanocaging on the photobleaching and oxygen consumption kinetics under 530 nm LED light in aqueous phosphate-buffered solutions. At 100 μM RB, the initial oxygen consumption rates increased by 58% and 80% compared with uncaged RB for the β and γ (2-hydroxypropyl) cyclodextrins, respectively. For 1 mM RB, the enhancement in these rates was much greater, about 200% and 300%, respectively. In addition, at 1 mM RB these two cyclodextrins increased the RB photobleaching rate by ~20% and ~75%. These results suggest that nanocages can minimize RB aggregation and may lead to higher-efficiency photo-medical therapies.

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PHOTO-INDUCED BINDING OF FLUORESCEIN DYES TO ZINC OXIDE¹

Cited by 5 publications

References 0 publications

Light-induced binding of riboflavin to lysozyme

Light-induced binding of riboflavin to lysozyme

New Experiments on the Sensitization of Zinc Oxide by Means of the Electrochemical Cell Technique

Nanocaging Rose Bengal to Inhibit Aggregation and Enhance Photo‐induced Oxygen Consumption^†

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PHOTO-INDUCED BINDING OF FLUORESCEIN DYES TO ZINC OXIDE1

Cited by 5 publications

References 0 publications

Light-induced binding of riboflavin to lysozyme

Light-induced binding of riboflavin to lysozyme

New Experiments on the Sensitization of Zinc Oxide by Means of the Electrochemical Cell Technique

Nanocaging Rose Bengal to Inhibit Aggregation and Enhance Photo‐induced Oxygen Consumption†

Contact Info

Product

Resources

About

PHOTO-INDUCED BINDING OF FLUORESCEIN DYES TO ZINC OXIDE¹

Nanocaging Rose Bengal to Inhibit Aggregation and Enhance Photo‐induced Oxygen Consumption^†