Abstract

The interaction between colloidal TiO 2 nanoparticles and lysozyme (LYSO) was studied using absorption, steady state and time resolved fluorescence, FT-IR and synchronous fluorescence spectroscopic measurements. The apparent association constant has been deduced from the absorption spectral changes of LYSO–colloidal TiO 2 nanoparticles using Benesi–Hildebrand equation. The number of binding sites and the apparent binding constant were calculated from relevant fluorescence data. Based on Forster's non-radiation energy transfer theory, distance between the donor (LYSO) and the acceptor (TiO 2) has also been calculated. The conformational changes of LYSO have been analyzed by means of FT-IR and synchronous fluorescence spectroscopy. In addition, the effect of metal ions on the binding constants of LYSO–TiO 2 complex has also been discussed.

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