Selective recovery of polyhydroxyalkanoate inclusion bodies from fermentation broth by dissolved-air flotation

Pim van Hee, Andrea C.M.R. Elumbaring, Rob G.J.M. van der Lans, Luuk A.M. Van der Wielen

Research output: Contribution to journalArticlepeer-review

Abstract

Selective dissolved-air flotation for the separation of medium-chain-length polyhydroxyalkanoate (PHA) inclusion bodies (IBs) from Pseudomonas putida cell debris is investigated. Measurements show that both P. putida cell debris and PHA IBs have an iso-electric point of approximately pH 3.5. Selective aggregation and as a result selective flotation of PHA IBs was observed near this pH. Qualitative prediction of the aggregation behaviour was possible on the basis of the Van der Waals, hydrophobic and electrostatic interactions. In some cases however, the stability of the suspension could not be explained with these forces alone. It was therefore suggested that additional interactions, such as steric/brush effects, play an important role in the aggregation process.

Original languageEnglish
Pages (from-to)595-606
Number of pages12
JournalJournal of Colloid and Interface Science
Volume297
Issue number2
DOIs
Publication statusPublished - 15 May 2006
Externally publishedYes

Keywords

  • Cell debris
  • Dissolved-air flotation
  • Inclusion body
  • Particle-particle separation
  • Polyhydroxyalkanoate (PHA)
  • Pseudomonas putida
  • Recovery

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