Adsorption of DNA at solid-water interfaces and DNA-surfactant binding interaction in aqueous media

摘要

Deoxyribonucleic acid or DNA is unable to accumulate at the air-water interface for structural reasons. However, use of analytical techniques, negatively charged DNA molecule in native and denatured states is observed to be adsorbed on different types of powdered rigid and soft particle under various physicochemical conditions. The thermodynamic affinities for DNA-particle interactions have been evaluated for different systems. From the kinetic studies of the adsorption processes, in the systems, different mechanisms of adsorption process have been suggested. Use of equilibrium dialysis and electrometric techniques extents of binding of cationic, neutral and anionic surfactants in equilibrium and non-equilibrium states have been determined and thermodynamic treatments of the data have been made. Recent extensive developments of these subjects made in the last two decades have been reviewed and possible applications of the topics for industrial applications and understanding of biological processes have been discussed in brief.