Effect of quercetin on micellization behaviour of Tween-20 in hydro-ethanolic solvent system: An electrolyte induced thermodynamic study

Abstract

The thermodynamic studies for non-ionic surfactant Tween-20 has been performed in presence of a well known flavonoid quercetin. The conductivity studies have been carried out with different concentrations of quercetin in 30% v/v ethanolic solution at five different temperatures (20 °C to 40 °C with difference of 5 °C). Since Tween-20 is non-ionic in nature, 1% w/v sodium chloride solution has been added as an electrolyte. Critical micelle concentration (CMC) and XCMC values as a function of temperature have been determined from conductance studies. Furthermore, various thermodynamic parameters viz. change in enthalpy (ΔH°m), entropy (ΔS°m) and Gibb's free energy (ΔG°m) of micellization have been calculated. Overall, the changes in micellization process of Tween-20 in presence of quercetin has been studied and reported.