Lhm. Da Silva et Aja. Meirelles, Phase equilibrium in polyethylene glycol/maltodextrin aqueous two-phase systems, CARBOHY POL, 42(3), 2000, pp. 273-278
The polysaccharide maltodextrin (MD) can provide a low cost alternative to
the fractionated dextran for the use with polyethylene glycol (PEG) in aque
ous two-phase. two-polymer systems. The physical characteristics of these M
D/PEG systems are similar in many respects to dextran/PEG systems. These sy
stems' behaviour was studied at 25 degrees C and local atmospheric pressure
(727 mmHg) under several concentration ratios and molecular weights of MD/
PEG. Molecular weight of PEG was 1450, 8000 and 10 000; and MD's molecular
weight was 2000 and 4000. This paper establishes phase diagram data, subseq
uently adjusting the NRTL model for the calculation of activity coefficient
s. The results are satisfactory and show the good descriptive quality of th
e model. (C) 2000 Elsevier Science Ltd. All rights reserved.