Title of article :
Ultrafiltration of mixed protein solutions of lysozyme and lactoferrin: role of modified inorganic membranes and ionic strength on the selectivity
Author/Authors :
M Rabiller-Baudry، نويسنده , , B Chaufer، نويسنده , , D Lucas، نويسنده , , F Michel، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2001
Pages :
12
From page :
137
To page :
148
Abstract :
Ultrafiltration of either single protein solutions (lysozyme 14,300 g mol−1, pI=11; lactoferrin 80,000 g mol−1, pI=8–9) or mixed protein solution was performed with inorganic membranes (MMCO 300,000 g mol−1, pore radius 14 nm) chemically modified in order to bear either pyrophosphate (PP, anionic) or ethylenediamine (EDA, cationic) groups. The electrophoretic mobility of modified and unmodified zirconia particles fouled with proteins was similar whatever the grafted groups, meaning that the membrane surface was always made of adsorbed proteins during UF. In spite of that, for the UF of lysozyme/lactoferrin mixed solution, the maximum selectivity (S=lysozyme transmission/lactoferrin transmission=165) was observed with the EDA membrane and allowed an instantaneous purity of lysozyme in the permeate close to 100% to be achieved. Such high selectivitiy was mainly due to the negligible transmission of lactoferrin with the membrane modified with the EDA groups in the ionic strength range 0–100 mmol l−1 of NaCl at pH 7 (achieved either for mixed and single solutions).
Keywords :
Lactoferrin , Selectivity , Modified charged membrane , Ionic strength , protein , lysozyme
Journal title :
Journal of Membrane Science
Serial Year :
2001
Journal title :
Journal of Membrane Science
Record number :
1350223
Link To Document :
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