Aqueous Two-Phase Systems. 2. Protein Partitioning

Hartoun Hartounian, Eric W. Kaler, Stanley I. Sandler

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


The role of polymer concentration, ionic strength, and salt type on the partitioning of proteins in aqueous two-phase systems is studied both experimentally and theoretically. Polymer-induced protein-protein interactions are also considered in terms of a perturbation theory, and are shown to not significantly affect the protein partition coefficient at moderate concentrations. A thermodynamic model combining the UNIQUAC and extended Debye-Hückel equations accounts for changes in salt type and salt concentration on protein partitioning with good accuracy, and calculated protein partition coefficients are in good agreement with experimental observations. Based on this detailed thermodynamic analysis, a simple model for the protein partition coefficient is developed and is shown to be useful for correlating measurements.

Original languageEnglish (US)
Pages (from-to)2294-2300
Number of pages7
JournalIndustrial and Engineering Chemistry Research
Issue number10
StatePublished - Oct 1 1994
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering


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