Abstract
The microenvironment of the probe coumarin 153 (C-153) in 1% bovine serum albumin (BSA) is more hydrophobic in nature compared to that in pure micelles or protein–surfactant complexes. In the native state of protein, we have not observed any solvation using C-153 as a probe but we have observed a slow dynamics on protein surface using 8-anilino-1-naphthalenesulfonic acid (ANS) as a probe. This may be due to the location of the probe (C-153) in the hydrophobic, solvent-inaccessible pocket of the BSA. Solvation dynamics in the BSA–surfactant (SDS) complexes in the solution phase is markedly different from that in pure micelles. This is may be due to the formation of ‘necklace and bead’ structure in the complexes. The rotational motion is also severely hindered in the surface of the protein.
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