Properties of Epigallocatechin-3-Gallate in Tween 80 Micelle

Epigallocatechin-3-gallate (EGCG) was successfully extracted from Huangshan green tea using an ion-precipitation and extraction technique. In the Tween 80/EGCG/H2O system, the critical micelle concentration of Tween 80 and the hydrodynamic radius of the Tween 80 micelles increase with increasing the EGCG concentration. As the concentration of Tween 80 increases, the intrinsic UV-Vis absorption and fluorescence intensities of EGCG increase, but the electrochemical diffusion coefficients of EGCG and Tween 80 decrease. We discuss the location of EGCG in the micelles.