title: Sequestration of Methylene Blue into Polyelectrolyte Complex Coacervates.
abstract: Polyelectrolyte complex coacervation is a process that has been proposed as a model for protocell formation due to its ability to compartmentalize chemicals in solution without a membrane. During the liquid-liquid phase separation that results in water rich and polyelectrolyte rich phases, small molecules present in solution selectively partition to one phase over the other. This sequestration is based on relative affinities. Here, a study of the sequestration of methylene blue (MB) into the complex coacervate phase of three pairs of synthetic polyelectrolytes is presented; branched polyethylene imine with polyacrylic acid, polyvinyl sulfonate, or poly(4-styrenesulfonic acid). These materials are characterized with UV-vis, zeta potential measurements, and dynamic light scattering. The branched polyethylene imine/poly(4-styrenesulfonic acid) system is shown to have a significantly higher sequestration capacity for the MB as compared to either of the other two systems, based on π-π interactions which are not possible in the other systems.
authors.affiliation: Department of Polymer Engineering, University of Akron, Akron, OH, 44325, USA.
authors.forename: Mengmeng
authors.initials: M
authors.lastname: Zhao
authors.affiliation: Department of Polymer Engineering, University of Akron, Akron, OH, 44325, USA.
authors.forename: Nicole S
authors.initials: NS
authors.lastname: Zacharia
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008751:Methylene Blue / Q000737:chemistry*; D055668:Photochemical Processes; D000071228:Polyelectrolytes / Q000737:chemistry*; D011094:Polyethyleneimine / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry*; D012996:Solutions; D055672:Static Electricity; D013451:Sulfonic Acids / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D000180:Acrylic Resins; D000071228:Polyelectrolytes; D011108:Polymers; D011145:Polyvinyls; D012996:Solutions; D013451:Sulfonic Acids; D014867:Water; C008959:lyapolate; C006903:carbopol 940; D011094:Polyethyleneimine; D008751:Methylene Blue; C077114:styrenesulfonic acid polymer
keywords: complex coacervation; partition; phase separation; polyelectrolyte; sequestration