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Study on the interaction between Avelox and Bovine serum albumin including the coexistent drugs by fluorescence spectroscopy

Shina Cao, Baosheng Liu, Zhiyun Li, Baohong Chong

The interaction between Avelox and bovine serum albumin (BSA) was investigated at different temperatures by fluorescence spectroscopy. Results showed that Avelox could quench the intrinsic fluorescence of BSA strongly, and the quenching mechanism was a static quenching process with Förester spectroscopy energy transfer. The electrostatic force played an important role on the conjugation reaction between BSA and Avelox. The order of magnitude of binding constants (Ka) was 104, and the number of binding site (n) in the binary systemwas approximately equal to 1. The binding distance (r) was less than 3 nm and the primary binding site for Avelox was located in sub-domain IIA of BSA. Synchronous fluorescence spectra clearly revealed that the microenvironment of amino acid residues and the conformation of BSA were changed during the binding reaction. In addition, the effect of some antibiotics on the binding constant ofAvelox with BSAwas also studied.