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Effect of Molecular Weight of Phase Polymers on Partition of Cells in Aqueous Two-Phase Systems

Published online by Cambridge University Press:  13 June 2017

Ehsan Atefi ,
Ramila Joshi  and
Hossein Tavana
Ehsan Atefi*
Affiliation:
Department of Mechanical Engineering, Manhattan College, Riverdale, NY 10471
Ramila Joshi
Affiliation:
Department of Biomedical Engineering, The University of Akron, Akron, OH 44325
Hossein Tavana*
Affiliation:
Department of Biomedical Engineering, The University of Akron, Akron, OH 44325
*
*Corresponding Authors Ehsan Atefi, Ph.D. Mechanical Engineering Department Manhattan College, Riverdale, New York 10471 Tel.: 718-862-7756 Email: ehsan.atefi@manhattan.edu Hossein Tavana, Ph.D., P.Eng. Department of Biomedical Engineering The University of Akron, Akron, Ohio 44325 Tel.: 330-972-6031 Email: tavana@uakron.edu
*Corresponding Authors Ehsan Atefi, Ph.D. Mechanical Engineering Department Manhattan College, Riverdale, New York 10471 Tel.: 718-862-7756 Email: ehsan.atefi@manhattan.edu Hossein Tavana, Ph.D., P.Eng. Department of Biomedical Engineering The University of Akron, Akron, Ohio 44325 Tel.: 330-972-6031 Email: tavana@uakron.edu
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Abstract

Due to their aqueous environment and biocompatible polymers, aqueous two-phase systems (ATPS) provide a mild environment for partition of cells. A comprehensive understanding of cell partition in ATPS will facilitate cell separation and fractionation in ATPS for downstream cell-based analytical applications and various cellular and molecular biology studies. We report the effect of molecular weight of phase polymers on partition of cells between two aqueous phases and their interface. We generate three different ATPS by dissolving polyethylene glycol and dextran of different molecular weights in a standard cell culture medium of fixed composition. After suspending cells in each ATPS, we quantify the number of cells partitioned into each segregated phase and the interface between the two phases. Importantly, we use two-phase solutions of an identical interfacial tension from each ATPS to avoid the effect of interfacial tension on cell partition. Our results indicate that decreasing the molecular weight of one of the phase polymers results in distribution of a greater number of cells toward the phase rich in that polymer. Regardless of molecular weight of polymers used, two-phase solutions made with higher concentrations of polymers cause a significant shift toward cell partition to the interface. This study elucidates the role of polymer molecular weight on cell partition in ATPS and offers formulations for rapid and effective cell partition.

Keywords

cellular (material type)molecular weightbiomaterial
Type
Articles
Information
MRS Advances , Volume 2 , Issue 45: Soft Materials and Biomaterials , 2017 , pp. 2415 - 2426
Copyright
Copyright © Materials Research Society 2017 

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