EQUILIBRIUM PHASE BEHAVIOR OF THE POLY(ETHYLENE GLYCOL)/POTASSIUM PHOSPHATE/WATER TWO-PHASE SYSTEM AT 4 C

The two-phase liquid-liquid equilibria behavior of the system composed of poly(ethylene glycol), potassium phosphate, and water at 4°C is presented. The effect of poly(ethylene glycol) molecular weight on phase separation at pH 7 was investigated by utilizing poly(ethylene glycol) of molecular weight 400, 600, 1000, 1500, 3400, 8000, and 20000