Interaction, thermodynamic, and solubilisation study of amino acid-tyrosine in aqueous anionic and cationic amphiphiles: electrical conductance and spectroscopic studies

Spectroscopic and conductometric approach was employed to study the effect of aromatic amino acid-tyrosine on the micellisation of hexadecyltrimethylammonium bromide and sodium dodecyl sulphate in aqueous medium. Tyrosine was used as an additive as well as a probe while recording the UV-visible spectrum. A simple experiment was performed were the conductivity and UV-visible spectrum of amino acid was utilised to determine the effect of increasing amphiphile concentration. The critical micelle concentration and various thermodynamic parameters such as Gibbs free energy of micellisation, Delta G(m)(0), enthalpy of micellisation, Delta H-m(0), entropy, Delta S-m(0), Gibbs free energy of transfer values, Delta G(m,trans)(0), hydrophobic free energy,Delta G(HP)(0), free energy associated with surface contribution, Delta G(S)(0), etc. were calculated to find the effect of this amino acid on the solubilisation, interaction, and aggregation process in aqueous medium.