Journal
JOURNAL OF LUMINESCENCE
Volume 129, Issue 4, Pages 344-348Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2008.10.020
Keywords
Daunorubicin; Fluorescence quenching; Lifetime; Solvent effect; Fluorescence decay; Quinizarin
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Funding
- King Fahd University of Petroleum and Minerals
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Steady-state fluorescence and time-resolved fluorescence intensity decays of daunorubicin have been studied in polar solvents and in aqueous solution by a time-correlated single-photon counting technique. Daunorubicin, quinizarin, and 2,3-dimethylquinizarin show bi-exponential decay. The decay of daunorubicin becomes tri-exponential in the presence of adenosine 5' monophosphate. The quenching of the fluorescence of daunorubicin by adenosine 5' monophosphate exhibits downward deviation from the Stern-Volmer linearity, suggesting the existence of fluorophore in two conformers in the ground state differing only in the extent of hydrogen bonding. (C) 2008 Elsevier B.V. All rights reserved.
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