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Titolo:
Application of a convection-diffusion-electrophoretic migration model to ultrafiltration of lysozyme at different pH values and ionic strengths
Autore:
Rabiller-Baudry, M; Chaufer, B; Aimar, P; Bariou, B; Lucas, D;
Indirizzi:
Univ Rennes 1, INRA, Lab Proc Separat, USC 991, F-35042 Rennes, France Univ Rennes 1 Rennes France F-35042 rat, USC 991, F-35042 Rennes, France Lab Genie chim, CNRS, UMR 5503, F-31062 Toulouse, France Lab Genie chim Toulouse France F-31062 MR 5503, F-31062 Toulouse, France
Titolo Testata:
JOURNAL OF MEMBRANE SCIENCE
fascicolo: 1-2, volume: 179, anno: 2000,
pagine: 163 - 174
SICI:
0376-7388(20001115)179:1-2<163:AOACMM>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
NANOFILTRATION MEMBRANES; PREDICTION; SEPARATION; FILTRATION; TRANSPORT; PROTEINS; ALBUMIN;
Keywords:
electrophoresis; mobility; ultrafiltration; protein; lysozyme; ion adsorption; model;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Rabiller-Baudry, M Univ Rennes 1, INRA, Lab Proc Separat, USC 991, Campus Beaulieu,Bat 10 A,263 Ave Gen Leclerc, F-35042 Rennes, France Univ Rennes 1Campus Beaulieu,Bat 10 A,263 Ave Gen Leclerc Rennes France F-35042
Citazione:
M. Rabiller-Baudry et al., "Application of a convection-diffusion-electrophoretic migration model to ultrafiltration of lysozyme at different pH values and ionic strengths", J MEMBR SCI, 179(1-2), 2000, pp. 163-174

Abstract

In order to account for the role of electrostatic interactions during ultrafiltration of a charged protein, electrokinetic characterisation of the protein-membrane-electrolyte system was performed. The zeta-potential (psi (z),) of the protein-fouled (membrane) material and the electrophoretic mobility (mu (i)) of the free protein depend on the pH, the ionic strength and the electrolyte chemical nature (indifferent or specifically adsorbed) used in the UF experiments. The free protein and the protein-fouled membrane were always carrying a charge close to each other. The electric field generated by the fouled membrane was found to be significant up to few nanometers from the membrane surface, depending on the ionicstrength. Repulsive electrostatic interactions between the fouled membraneand the free protein in this sub-layer, were accounted for by a convection-diffusion-electrophoretic migration approach in the polarisation layer (CDE model). A peculiarity of the CDE model is to predict a depleted sub-layer in the close Vicinity of highly charged membranes. Consequently a new electrostaticpartition coefficient phi (e), accounting for the repulsive effect outsidethe charged membrane, can be introduced. A new dimensionless number mu (i)psi (z)/Jd (analogous to a Peclet number)is defined. The electrophoretic mobility appears as a significant UF parameter, when this ratio is higher than 0.1. (C) 2000 Elsevier Science B.V. All rights reserved.

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Documento generato il 26/01/21 alle ore 02:47:46