Interaction of bovine serum albumin with cationic monomeric and dimeric surfactants: A comparative study

The interaction of bovine serum albumin (BSA) with a single chain cationic surfactant, dodecyl trimethylammonium bromide (DTAB) and three dimeric surfactants viz., butanediyl-1,4 bis(dimethyldodecylammonium bromide (12-4-12,2Br(-)), 2- butanol-1,4-bis(dimethyldodecylammonium bromide) (12-4(OH)-12,2Br(-)), 2,4-dibutanol-1,4 bis(dimethyldodecylammonium bromide) (12-4(OH)(2)-122Br(-)) have been investigated by means of surface tension, conductance, viscosity, fluorescence and UV-Visible spectroscopic measurements. The results obtained depict that the hydroxyl group substitution in linker of gemini surfactants affects the BSA-surfactant interactions. As compared to single chain cationic surfactants, gemini surfactants show more interactions with BSA. The negetive values of thermodynamic parameters viz., Gibbs free energy of micellization (Delta G degrees(m)), Gibbs free energy of adsorption (Delta G degrees(ads)) and Gibbs free energy of quenching process (Delta G degrees(q)) showed spontaneity of micellization process. (c) 2016 Elsevier B.V. All rights reserved.