Influence of amino acids on the micellar behaviour of non-ionic surfactant in aqueous medium

The phenomenon of micellization in non-ionic surfactant Brij-58 (Bj-58) have been studied by measuring the cloud points (CP) of the pure surfactant and mixed system with Alanine (Ala) and Phenylalanine (PA). The CP of pure surfactant found to be decreased with increased [ Bj-58]. The CP of mixed system also shows same trends with increased [Ala] and [PA]. This is mainly due to increase in micelle concentration. The phase separation results from micelle-micelle interaction. Considering CP as a threshold temperature of the solubility, the thermodynamic parameters of clouding process (ΔGcl , ΔH 0 cl and ΔS 0 cl ) have been evaluated using “Phase Separation Model”. The findings of the present work supports to made the probable evidence of macromolecule-surfactant interactions in aqueous medium.