Combined experimental and computational investigation of the fluorescence quenching of riboflavin by cinnamic alcohol chemisorbed on silica nanoparticles
Riboflavin (vitamin B2) is usually present in water courses, lakes, and seas and acts as a photosensitizer in the photo-oxidation of a range of contaminants. However, little is known about the interaction of this compound with aromatics sorbed on silica sediments or on suspended silica particles. Th...
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2014
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19327447_v118_n28_p15348_Arce http://hdl.handle.net/20.500.12110/paper_19327447_v118_n28_p15348_Arce |
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paper:paper_19327447_v118_n28_p15348_Arce2023-06-08T16:31:35Z Combined experimental and computational investigation of the fluorescence quenching of riboflavin by cinnamic alcohol chemisorbed on silica nanoparticles Fluorescence Fluorescence spectroscopy Fourier transform infrared spectroscopy Magic angle spinning Photosensitizers Quenching Silica Suspended sediments Thermoanalysis Computational investigation Cross polarizations Fluorescence quenching Marine bacterium Riboflavin (Vitamin B2) Silica nanoparticles Silica particles Vibrio fischeri Suspensions (fluids) Riboflavin (vitamin B2) is usually present in water courses, lakes, and seas and acts as a photosensitizer in the photo-oxidation of a range of contaminants. However, little is known about the interaction of this compound with aromatics sorbed on silica sediments or on suspended silica particles. This article describes the modification and characterization of silica nanoparticles by condensation of the silanol groups of the particles with E-cinnamic alcohol. The reaction was confirmed by Fourier transform infrared spectroscopy (FTIR), solid-state 13C and 29Si cross-polarization magic angle spinning (CPMAS) NMR, reduction of the specific surface area measured by BET, thermal analysis, and fluorescence spectroscopy. Toxicity to the marine bacteria Vibrio fischeri of the modified particles was also measured. Riboflavin fluorescence was quenched in aqueous medium in the presence of dissolved E-cinnamic alcohol or in suspensions of the modified particles. The results are interpreted in terms of formation of 1:1 complexes between the ground states of riboflavin and the free or adsorbed cinnamic alcohol. Density functional theory (DFT) calculations in aqueous medium support the existence of the complex and explain the observed quenching of riboflavin fluorescence upon addition of cinnamic alcohol without affecting the emission maximum of riboflavin. © 2014 American Chemical Society. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19327447_v118_n28_p15348_Arce http://hdl.handle.net/20.500.12110/paper_19327447_v118_n28_p15348_Arce |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Fluorescence Fluorescence spectroscopy Fourier transform infrared spectroscopy Magic angle spinning Photosensitizers Quenching Silica Suspended sediments Thermoanalysis Computational investigation Cross polarizations Fluorescence quenching Marine bacterium Riboflavin (Vitamin B2) Silica nanoparticles Silica particles Vibrio fischeri Suspensions (fluids) |
| spellingShingle |
Fluorescence Fluorescence spectroscopy Fourier transform infrared spectroscopy Magic angle spinning Photosensitizers Quenching Silica Suspended sediments Thermoanalysis Computational investigation Cross polarizations Fluorescence quenching Marine bacterium Riboflavin (Vitamin B2) Silica nanoparticles Silica particles Vibrio fischeri Suspensions (fluids) Combined experimental and computational investigation of the fluorescence quenching of riboflavin by cinnamic alcohol chemisorbed on silica nanoparticles |
| topic_facet |
Fluorescence Fluorescence spectroscopy Fourier transform infrared spectroscopy Magic angle spinning Photosensitizers Quenching Silica Suspended sediments Thermoanalysis Computational investigation Cross polarizations Fluorescence quenching Marine bacterium Riboflavin (Vitamin B2) Silica nanoparticles Silica particles Vibrio fischeri Suspensions (fluids) |
| description |
Riboflavin (vitamin B2) is usually present in water courses, lakes, and seas and acts as a photosensitizer in the photo-oxidation of a range of contaminants. However, little is known about the interaction of this compound with aromatics sorbed on silica sediments or on suspended silica particles. This article describes the modification and characterization of silica nanoparticles by condensation of the silanol groups of the particles with E-cinnamic alcohol. The reaction was confirmed by Fourier transform infrared spectroscopy (FTIR), solid-state 13C and 29Si cross-polarization magic angle spinning (CPMAS) NMR, reduction of the specific surface area measured by BET, thermal analysis, and fluorescence spectroscopy. Toxicity to the marine bacteria Vibrio fischeri of the modified particles was also measured. Riboflavin fluorescence was quenched in aqueous medium in the presence of dissolved E-cinnamic alcohol or in suspensions of the modified particles. The results are interpreted in terms of formation of 1:1 complexes between the ground states of riboflavin and the free or adsorbed cinnamic alcohol. Density functional theory (DFT) calculations in aqueous medium support the existence of the complex and explain the observed quenching of riboflavin fluorescence upon addition of cinnamic alcohol without affecting the emission maximum of riboflavin. © 2014 American Chemical Society. |
| title |
Combined experimental and computational investigation of the fluorescence quenching of riboflavin by cinnamic alcohol chemisorbed on silica nanoparticles |
| title_short |
Combined experimental and computational investigation of the fluorescence quenching of riboflavin by cinnamic alcohol chemisorbed on silica nanoparticles |
| title_full |
Combined experimental and computational investigation of the fluorescence quenching of riboflavin by cinnamic alcohol chemisorbed on silica nanoparticles |
| title_fullStr |
Combined experimental and computational investigation of the fluorescence quenching of riboflavin by cinnamic alcohol chemisorbed on silica nanoparticles |
| title_full_unstemmed |
Combined experimental and computational investigation of the fluorescence quenching of riboflavin by cinnamic alcohol chemisorbed on silica nanoparticles |
| title_sort |
combined experimental and computational investigation of the fluorescence quenching of riboflavin by cinnamic alcohol chemisorbed on silica nanoparticles |
| publishDate |
2014 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19327447_v118_n28_p15348_Arce http://hdl.handle.net/20.500.12110/paper_19327447_v118_n28_p15348_Arce |
| _version_ |
1768544707072229376 |