Interfacial partition of plasmid DNA in aqueous two-phase systems

F Luechau, TC Ling, Andrew Lyddiatt

Research output: Contribution to journalArticle

2 Citations (Scopus)


In this paper, the partition of plasmid DNA (pDNA) in polyethylene glycol (PEG) 300 and di-potassium hydrogen phosphate aqueous two-phase systems (ATPS) under gravity separation was investigated. The influence of temperature (20 and 30 degrees C) and mode of phase separation (40-60% (w/w) lysate concentrations) on the pDNA partition behaviour was studied. At 20 degrees C, 70.7% of pDNA partitioned to the top phase while the recoveries in the interface and bottom phase were comparatively small. At 30 degrees C, the partition had switched from a top phase preference to an interface preference where 73.9% of pDNA was recovered. The distribution of pDNA between the top phase and interface is effectively time-dependent during gravitational phase separation. Systems with lysate concentrations between 40 and 50% (w/w) separated with a continuous bottom phase and a dispersed PEG-rich top phase. For ATPS with 55 and 60% (w/w) lysate, the top phase was continuous and the bottom phase was dispersed. (C) 2009 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)64-70
Number of pages7
JournalSeparation and Purification Technology
Issue number1
Publication statusPublished - 1 May 2009


  • Interfacial partition
  • Top phase
  • Aqueous two-phase systems
  • Plasmid DNA
  • Bottom phase


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