Spectroscopic studies on the interaction of bovine serum albumin with surfactants and apigenin

The binding of apigenin (Ap) to bovine serum albumin (BSA) has been studied using the methods of fluorescence spectroscopy and UV-vis absorption spectroscopy. The spectroscopic analysis of the quenching mechanism indicates that the quenching constants are inversely correlated with the temperatures and the quenching process could result from a static interaction. The type of interaction force was discussed and the binding site of Ap was in site I (subdomain IIA) of BSA. The thermodynamic parameters Delta H and Delta S are -42.02 kJ mol(-1) and -48.31 J mol(-1) K-1, respectively and the negative Delta G implying that the binding interaction was spontaneous. The distance r between BSA and Ap was calculated according to Forster's theory and the value is 3.44 nm. The synchronous and three-dimensional fluorescence spectra show that the binding of Ap to BSA could lead to the changes in the conformation and microenvironment of BSA. At the same time, the effects of ionic surfactants on the interaction of Ap and BSA have also been investigated. (C) 2012 Published by Elsevier B.V.