Fluorescence and surface studies of the biologically active molecules with Industrially important Ionic surfactants

The surface tension and fluorescence measurements have been carried out to study the interactions present between anionic surfactant, sodium dodecyl benzene sulfonate (SDBS) and cationic surfactant, dodecyltrimethylammonium bromide (DTAB), in aqueous solution, in presence and absence of additives (glutamine, histidine and methionine) at different composition and temperature. Critical micelle concentrations (CMCs) have been determined using surface tension measurement. In case of SDBS, the CMC value increases with rise in temperature while in case of DTAB, it shows a U-type behavior, meaning thereby, both hydrophobic and hydrophilic dehydration becomes prominent in case of DTAB while only hydrophilic dehydration plays decisive role for the micellization to take place in case of SDBS. From surface tension data, the surface excess concentration at air/water interface (Γmax), minimum area per surfactant molecule (Amin) and the surface pressure at CMC (πCMC) have been evaluated. Thermodynamic parameters of transfer, adsorption and micellization have also been evaluated and discussed in detail. Fluorescence probe study has been carried out to outline the results stated above. The CMC values calculated using pyrene as a fluorescent probe at room temperature resembles well with the micellar values determined using surface tension measurement

Dr. Kundan Sharma is an accomplished academic and researcher specializing in physical chemistry, particularly related to surfactant solutions with amino acid and polymers and their application in pharmaceuticals and food industries. He has an extensive educational background, holding a Ph.D. in Chemistry from Himachal Pradesh University, Shimla and numerous accolades, including a selection in postdoctoral fellowship in Finland. He has been awarded for his research and contributions, including the DST Young Scientist grant to the University of Regensburg Germany and gold medal in Master of Philosophy. He has published 22 peer-reviewed articles in reputed journals, focusing on surfactant interactions and their thermodynamic properties. His h-index is 19 and i-10 index is 21 along with 1000 citations. He has also been awarded with the outstanding reviewer status of the Journal of Molecular liquids (Elsevier).