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Absorption and emission spectroscopic characterisation of 8-amino-riboflavin

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2009

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Tyagi, Amit
Penzkofer, Alfons
Mathes, Tilo
Hegemann, Peter

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https://doi.org/10.1016/j.chemphys.2009.08.005
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Chemical Physics. Elsevier. 2009, 364(1-3), pp. 19-30. ISSN 0301-0104. eISSN 1873-4421. Available under: doi: 10.1016/j.chemphys.2009.08.005

Zusammenfassung

The flavin dye 8-amino-8-demethyl-d-riboflavin (AF) in the solvents water, DMSO, methanol, and chloroform/DMSO was studied by absorption and fluorescence spectroscopy. The first absorption band is red-shifted compared to riboflavin, and blue-shifted compared to roseoflavin (8-dimethylamino-8-demethyl-D-riboflavin). The fluorescence quantum yield of AF in the studied solvents varies between 20% and 50%. The fluorescence lifetimes were found to be in the 2–5 ns range. AF is well soluble in DMSO, weakly soluble in water and methanol, and practically insoluble in chloroform. The limited solubility causes AF aggregation, which was seen in differences between measured absorption spectra and fluorescence excitation spectra. Light scattering in the dye absorption region is discussed and approximate absorption cross-section spectra are determined from the combined measurement of transmission and fluorescence excitation spectra. The photo-stability of AF was studied by prolonged light exposure. The photo-degradation routes of AF are discussed.

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570 Biowissenschaften, Biologie

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ISO 690TYAGI, Amit, Peyman ZIRAK, Alfons PENZKOFER, Tilo MATHES, Peter HEGEMANN, Matthias MACK, Sandro GHISLA, 2009. Absorption and emission spectroscopic characterisation of 8-amino-riboflavin. In: Chemical Physics. Elsevier. 2009, 364(1-3), pp. 19-30. ISSN 0301-0104. eISSN 1873-4421. Available under: doi: 10.1016/j.chemphys.2009.08.005
BibTex
@article{Tyagi2009Absor-58105,
  year={2009},
  doi={10.1016/j.chemphys.2009.08.005},
  title={Absorption and emission spectroscopic characterisation of 8-amino-riboflavin},
  number={1-3},
  volume={364},
  issn={0301-0104},
  journal={Chemical Physics},
  pages={19--30},
  author={Tyagi, Amit and Zirak, Peyman and Penzkofer, Alfons and Mathes, Tilo and Hegemann, Peter and Mack, Matthias and Ghisla, Sandro}
}
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