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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
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Temperature-Responsive Zwitterionic Polymers That Undergo UCST-Type Liquid-Liquid Phase Separation under

Yuto Fujii1, Akifumi Kawamura1,2, Nobuyuki Morimoto3

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Researchers developed novel temperature-responsive zwitterionic polymers that undergo upper critical solution temperature (UCST)-type liquid-liquid phase separation (LLPS) under physiological conditions. These polymers form coacervate droplets below their cloud point, offering new possibilities for biomaterials and drug delivery.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Biophysics

Background:

  • Liquid-liquid phase separation (LLPS) is crucial for cellular organization and function.
  • Temperature-responsive polymers exhibit phase transitions with temperature changes.
  • Achieving UCST-type LLPS in polymers under physiological ionic strength remains challenging.

Purpose of the Study:

  • To synthesize novel temperature-responsive zwitterionic polymers.
  • To investigate their UCST-type LLPS behavior in aqueous media with physiological ionic strength.
  • To explore the influence of copolymer composition and ionic strength on phase separation.

Main Methods:

  • Copolymerization of sulfabetaine (SaB) and sulfobetaine (SB) monomers.
  • Characterization of cloud point (CP) transitions with temperature.
  • Microscopic observation of coacervate droplet formation and dissolution.

Main Results:

  • Synthesized P(SaB-co-SB) copolymers exhibiting UCST-type LLPS at physiological ionic strength.
  • Observed that CP increases with higher SaB content.
  • Demonstrated coacervate droplet formation below CP and dissolution above CP, unlike typical UCST polymers.

Conclusions:

  • Zwitterionic copolymers P(SaB-co-SB) enable UCST-type LLPS under physiological conditions.
  • Dipole-dipole interactions between SaB units are key to this phenomenon.
  • These polymers show potential for applications requiring tunable phase separation in biological environments.