6533b7d6fe1ef96bd1265c36

RESEARCH PRODUCT

Joint Aqueous Solutions of Dextran and Bovine Serum Albumin: Coexistence of Three Liquid Phases

Yurij A. AntonovBernhard A. Wolf

subject

chemistry.chemical_classificationAqueous solutionbiologyPolymersGlobular proteinAnalytical chemistryDextransSerum Albumin BovineSurfaces and InterfacesPolymerFlory–Huggins solution theoryCondensed Matter PhysicsSolutionschemistry.chemical_compoundDextranchemistryElectrochemistrybiology.proteinAnimalsCattleGeneral Materials SciencePolymer blendBovine serum albuminSpectroscopyPhase diagram

description

The phase diagram of the system water/dextran (DEX)/BSA was measured as well as modeled. On the experimental side, cloud points were determined and the coexisting phases were analyzed. The theoretical calculations use an approach capable of describing solutions of chain polymers and of globular proteins with the same formalism. The required thermodynamic input comes from experiments concerning the binary subsystems, except for the polymer blend for which one interaction parameter had to be adjusted. Both sources of information yield the same essential features: the existence of a large composition area of immiscibility, starting from the subsystem DEX/BSA and extending well into the region of dilute polymer solutions. This range is subdivided into three sections: one two-phase area at high polymer content, a two-phase area at low polymer content, and a three-phase region located in between. Measured and calculated phase diagrams match qualitatively; the reasons for the quantitative discrepancies are being discussed.

yearjournalcountryeditionlanguage
2014-05-17Langmuir
https://doi.org/10.1021/la501419e