Spectroscopic study of photo and thermal destruction of riboflavin

Astanov, S.; Sharipov, M.Z.; Fayzullaev, A.; Kurtaliev, Eldar N.; Nizomov, N.

doi:10.1016/j.molstruc.2014.04.077

Cited by 25 publications

(22 citation statements)

References 13 publications

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“…We observed similar concentration quenching of luminescence in binary solvent mixtures for natural dyes. This process is associated with the aggregation of the studied compounds [8][9][10].…”

Section: Riboflavin Aggregatesmentioning

confidence: 98%

“…On the basis of the results obtained, the dipole moments of the ground (µ) and excited (µ*), electronic states of the compound under study were calculated [9]. The calculated values of the dipole moments are µ=7.222 Db and µ* = 23.538 Db, respectively.…”

Section: Electronic Bands Of Riboflavin Monomers and Self-aggregatesmentioning

confidence: 99%

“…One of these possibilities was realized using the Jasko-20 circular dichrograph with the optical prefix of the double Fresnel parallelepiped. The optical set-top box is designed for studies in the visible and UV part of the spectrum [8,9].…”

Section: Electronic Bands Of Riboflavin Monomers and Self-aggregatesmentioning

confidence: 99%

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Hipochromic Effect in Riboflavin Solutions

Astanov¹,

Sharipov²,

Kasimova³

2019

Eurasian phys. tech. j.

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The process of self-assembly of riboflavin molecules in aqueous and binary mixtures of solvents was investigated by a spectroscopic method. It was shown that the self-assembly of vitamin B2 molecules by the dipole-dipole interaction of van der Waals forces, as a result of which resonant splitting of excited electronic levels of riboflavin occurs. In concentrated solutions and in binary mixtures of solvents, the observed hypochromic effects are due to a decrease in the intensity of the absorption capacity of self-aggregated riboflavin molecules relative to their monomers. The absorption band of self-assembled riboflavin molecules is determined by the obtained linear dichroism spectra in a laminar hydrodynamic flow.

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Section: Riboflavin Aggregatesmentioning

confidence: 98%

Section: Electronic Bands Of Riboflavin Monomers and Self-aggregatesmentioning

confidence: 99%

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Hipochromic Effect in Riboflavin Solutions

Astanov¹,

Sharipov²,

Kasimova³

2019

Eurasian phys. tech. j.

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“…The photodegradation pathways of riboflavin have been studied elsewhere. [77][78][79][80] The photoreactivity of riboflavin arises from its triplet excited state. The absorbance of riboflavin decays monoexponentially (0.14 s -1 ) when irradiated in absence of oxygen.…”

Section: Photochemical Stability Of Dyesmentioning

confidence: 99%

Impact of Binding to the Multidrug Resistant Regulator Protein LmrR on the Photo-Physics and -Chemistry of Photosensitizers

Mejías¹,

Roelfes²,

Browne³

2020

Preprint

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Light activated photosensitizers generate reactive oxygen species (ROS) that interfere with cellular components and can induce cell death, e.g., in photodynamic therapy (PDT). The effect of cellular components and especially proteins on the photochemistry and photophysics of the sensitizers is a key aspect in drug design and the correlating cellular response with the generation of specific ROS species. Here, we show the complex range of effects of binding of photosensitizer to a multidrug resistance protein, produced by bacteria, on the formers reactivity. We show that recruitment of drug like molecules by LmrR (Lactococcal multidrug resistance Regulator) modifies their photophysical properties and their capacity to induce oxidative stress especially in 1O2 generation, including rose bengal (RB), protoporphyrin IX (PpIX), bodipy, eosin Y (EY), riboflavin (RBF), and rhodamine (Rh6G). The range of neutral and charged dyes with different exited redox potentials, are broadly representative of the dyes used in PDT.

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“…Polarization spectra provide information on the orientation of the molecules of dissolved substances, and also these spectra are more informative with respect to electronic spectra [1]. The photophysical and photochemical properties and processes occurring in solutions of vitamin preparations were studied in [2][3][4][5][6]. Molecules of plant origin have such characteristics that determine their photostability and thermal stability, these characteristics are a guarantee of their use in pharmaceuticals and medicine.…”

Section: Introductionmentioning

confidence: 99%

Optical Systems for Removal of Polarization Spectra

Astanov¹

2019

Eurasian phys. tech. j.

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In the article optical systems are presented that are developed by the authors and have been used for many years to remove the polarization properties of anisotropic molecules. Both systems are designed for visible and close to ultraviolet spectral regions. In this case, the double Fresnel parallelepiped plays the role of an achromatic quarter of the wave plate. They are used in the Jasco-20 dichrograph after the Pockels cell. As a result, the sensitivity of the device increases from to of the value of the differences in optical density.

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Spectroscopic study of photo and thermal destruction of riboflavin

Cited by 25 publications

References 13 publications

Hipochromic Effect in Riboflavin Solutions

Hipochromic Effect in Riboflavin Solutions

Impact of Binding to the Multidrug Resistant Regulator Protein LmrR on the Photo-Physics and -Chemistry of Photosensitizers

Optical Systems for Removal of Polarization Spectra

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