Abstract
Solvent effects on photophysical and photochemical properties of mono-biotinylated curcumin (mbt-Cur) in comparison with curcumin (Cur) were studied. Same with Cur, mbt-Cur dominantly adopts ‘enol-keto’ configuration in all solvents stabilized by intramolecular H-bond. In non-protic solvents, the photophysical properties of mbt-Cur depend on the solvent polarity parameter Δf. In H-bond solvent methanol, dramatic deviation of all photophysical properties from the correlation established in non-H-bond solvent occurred. H-bond capability of solvent was found to determine the excitation dynamic mechanism of mbt-Cur at a microsecond timescale. This research laid the foundation for further application of mbt-Cur in biological systems.
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