Sheared aqueous two-phase biopolymer-surfactant mixtures

Fotios Spyropoulos, W Frith, Ian Norton, B Wolf, Andrzej Pacek

Research output: Contribution to journalArticle

15 Citations (Scopus)


Aqueous two-phase biopolymer-surfactant mixtures have so far received only little attention. Here, the behaviour of such mixtures was investigated adopting methods well established for aqueous two-phase biopolymer-biopolymer mixtures. The pullulan-sodiurn clodecyl sulphate (SDS) mixture, in which phase separation can be induced, and then enhanced by the addition of sodium chloride (NaCl), was chosen as a model system and its morphology and rheology under shear was analysed. Rheological measurements on phase-separated mixtures revealed that the viscosity depends on the chemical composition of the single phases, their viscosity ratio and volume fraction. Optical observations showed droplet-like morphology over a wide range of shear rates at low volume fractions of one phase, and co-continuous structures including string phases at high volume fractions and shear rates. For more concentrated systems, co-continuous structures were observed at all shear rates investigated, whereby in some cases string phases developed at high shear rates. (C) 2007 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)121-129
Number of pages9
JournalFood Hydrocolloids
Publication statusPublished - 1 Jan 2008


  • morphology
  • surfactant
  • rheology
  • co-continuity
  • biopolymer
  • aqueous two-phase systems


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