Effect of Adsorbed Protein on the Hydraulic Permeability, Membrane and Streaming Potential Values Measured across a Microporous Membrane

Juana Benavente, Gunnar Eigil Jonsson

Research output: Contribution to journalConference articleResearchpeer-review

Abstract

The effect of the adsorption of a protein, bovine serum albumin (BSA), on the membrane potential, flux reduction and streaming potential measured across a microporous polysulphone membrane with different NaCl solutions and pH values is studied. From electrokinetic phenomena, information about the electrical properties of the membrane (fixed charge concentration and ionic transport numbers) or the membrane/solute interactions (streaming and zeta potentials) can be obtained. The influence of pH and ionic strength on volume flux and streaming potential values is considered. Results show that hydraulic permeability decreases strongly when the pH decreases, having its minimum value at the isoelectric point of the protein; the apparent zeta potential values are also dependent on both pH and salt concentration.

Differences in the streaming potential coefficient determined for two membranes fouled under different experimental conditions may be attributed to different mechanisms for the adsorption of proteins in the membrane: (i) a protein deposition on the membrane pores; () an adsorbed layer of protein on the membrane surface. In this latter case, the whole membrane system can be considered as a "composite" or two-layer membrane, and a comparison of the results obtained with both microporous polysulphone and "composite" (microporous + BSA layer) membranes could permit us to determine some parameters related to the protein sublayer. (C) 1998 Elsevier Science B.V.
Original languageEnglish
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume138
Issue number2-3
Pages (from-to)255-264
ISSN0927-7757
DOIs
Publication statusPublished - 15 Jul 1998
EventWorkshop on Colloid Science in Membrane Engineering - Toulouse, France
Duration: 13 May 199615 May 1996

Workshop

WorkshopWorkshop on Colloid Science in Membrane Engineering
CountryFrance
CityToulouse
Period13/05/199615/05/1996

Keywords

  • fouled membranes
  • membrane potential
  • protein adsorption
  • streaming potential
  • zeta potential

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