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Aqueous Two-Phase Systems: simple one-step process formulation and phase diagram for characterisation

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Abstract

Aqueous two-phase system (ATPS), also called “water-in-water” emulsion, is a multi-component system (aqueous droplets dispersed in a continuous aqueous phase), formed after gently mixing two aqueous solutions of immiscible polymers. It allows the formation of different compartments without adding any organic solvent, according to a green process. Nevertheless, the kinetic stability of ATPS is generally difficult to control. Phase diagrams, which express the concentration of a polymer as a function of that of the other in solution, are used to characterise ATPS and to determine conditions for preparing emulsions from selected polymers. In this study, dextran and polyethylene oxide aqueous mixtures with different processing parameters are investigated. Phase diagrams are generated through two automatic methods (Turbiscan and LUMiSizer® technologies) and a manual one. With the diagrams obtained, it is concluded that the purity of polyethylene oxide affects the ATPS, whereas the use of polymers in powder or in solution form has no effect. In view of this result, it is allowed to prepare ATPS formulation by a simple one-step process from polymers in powder form.

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Data availability

Supporting information is available.

Abbreviations

ATPS:

aqueous two-phase system

Dex:

dextran

PEO:

polyethylene oxide

Wt%:

mass concentration as a percentage

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Authors and Affiliations

  1. Micro et Nanomedecines Translationnelles, MINT, UNIV Angers, UMR INSERM 1066, UMR CNRS 6021, Angers, France

    Florence Dumas, Emilie Roger, Johanna Rodriguez & Jean-Pierre Benoit

  2. Institut des Molécules et Matériaux du Mans, IMMM, UNIV Le Mans, UMR 6283 CNRS, Le Mans, France

    Lazhar Benyahia

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  1. Florence Dumas
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  2. Emilie Roger
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Correspondence to Emilie Roger.

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Dumas, F., Roger, E., Rodriguez, J. et al. Aqueous Two-Phase Systems: simple one-step process formulation and phase diagram for characterisation. Colloid Polym Sci 298, 1629–1636 (2020). https://doi.org/10.1007/s00396-020-04748-8

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