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Dynamics of the ceramic ultrafiltration of model proteins with different isoelectric point: Comparison of β-lactoglobulin and lysozyme

Authors :
Antonio Guadix
Rubén Ibáñez
M. Carmen Almécija
Emilia M. Guadix
Source :
Separation and Purification Technology. 57:314-320
Publication Year :
2007
Publisher :
Elsevier BV, 2007.

Abstract

The study of the electrostatic interactions in the ultrafiltration of single model proteins is an important topic for the biotechnology industry interested in the fractionation of protein mixtures. In this paper, the dynamics of the ultrafiltration of β-lactoglobulin and lysozyme through a 300 kDa tubular ceramic membrane was investigated. The time evolution of permeate flux and protein transmission were determined at a temperature of 30 °C, a cross-flow velocity of 3.5 m/s and a transmembrane pressure of 100 kPa. The influence of pH was monitored in the 3–9 interval for β-lactoglobulin and in the 5–12 interval for lysozyme. The effect of ionic strength was studied by increasing the addition of NaCl up to 15 mM. The curves of permeate flux were discussed according to the resistances in series model. Since β-lactoglobulin and lysozyme have acid and alkaline isoelectric points, respectively, the results showed different responses with respect to the electrostatic environment.

Details

ISSN :
13835866
Volume :
57
Database :
OpenAIRE
Journal :
Separation and Purification Technology
Accession number :
edsair.doi...........7e364b2331f53b58c66d04c0bef6bd77
Full Text :
https://doi.org/10.1016/j.seppur.2007.05.001