Interfacial Tension and Viscosity for Poly(ethylene glycol) + Maltodextrin Aqueous Two-Phase Systems

Abstract

This study presents interfacial tension and viscosity experimental data, at 30 °C, for aqueous two-phase systems (ATPS) composed of poly(ethylene glycol) (PEG) with different molar mass (4000, 6000, and 8000) g·mol-1 and maltodextrin (MD), with molar mass of 2800 g·mol-1. Interfacial tension and viscosity were measured by using a spinning drop tensiometer and a rolling ball viscosimeter, respectively. An increase on the PEG molar mass resulted in an increase of interfacial tension and viscosity. The interfacial tension varied from (0.038 to 0.121) mN·m-1 for the systems formed by PEG 4000 (w = 0.08) + MD (w = 0.35) + water (w = 0.57) and PEG 8000 (w = 0.10) + MD (w = 0.30) + water (w = 0.60), respectively. Viscosity values varied from (7.9 × 10-3 to 2.17 × 10-2) Pa·s for the PEG-rich phase and from (4.51 × 10-2 to 6.54 × 10-2) Pa·s for the MD-rich phase.