Competitive adsorption of l-α-lysophosphatidylcholine/β-lactoglobulin mixtures at the interfaces of foams and foam lamellae

Dipak Sarker, Peter J. Wilde, David C. Clark

Research output: Contribution to journalArticle

Abstract

The stability of foams formed with the protein β-lactoglobulin as a function of increasing concentration of the lipid analogue l-α-lysophosphatidylcholine were investigated using a microconductivity technique. The drainage, surface diffusion and thickness properties of thin liquid films (foam lamallae) were also studied using optical microscopy including epi-illumination, fluorescence recovery after photobleaching and film interferometry techniques. In addition, the surfactant binding properties of the protein were examined. The addition of small quantities of l-α-lysophosphatidylcholine to β-lactoglobulin (molar ratio, R < 7:1) increased the foam stability, whereas a slightly higher concentration of surfactant in the mixture (R = 10) caused foam destabilisation. The explanation of these observations is based on changes in the composition and structure of the adsorbed interfacial layers of the thin films caused by competitive displacement of the protein by the surfactant.
Original languageEnglish
Pages (from-to)349-256
Number of pages248
JournalColloids and Surfaces B: Biointerfaces
Volume3
Issue number6
DOIs
Publication statusPublished - 9 Jan 1995

Keywords

  • Competitive adsorption
  • Foam lamellae
  • Foam stability
  • Phospholipid
  • Protein

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  • Activities

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    • 1 Oral presentation

    Functional Foods and Food Functionalisation.

    Dipak Sarker (Presenter)

    4 Feb 2015

    Activity: External talk or presentationInvited talk

    Interfacial rheological properties of Tween20: β-lactoglobulin mixed systems as affected by phenolic antioxidant compounds.

    Dipak Sarker (Presenter)

    21 Mar 201024 Mar 2010

    Activity: External talk or presentationOral presentation

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