title: Electrostatic interactions in protein adsorption probed by comparing lysozyme and succinylated lysozyme.
abstract: The influence of electrostatic interactions on protein adsorption was studied by comparing the adsorption of lysozyme and succinylated lysozyme at silica surfaces. The succinylation affects the charge of the protein, but also the stability. Although changes in stability can have an influence on adsorption, our data show that the primary effect can be entirely understood in terms of electrostatic interactions. The adsorbed amount as a function of pH has a maximum for both proteins. This maximum coincides with the isoelectric point for succinylated lysozyme, and is close to the isoelectric point for lysozyme. At pH values where the protein is electrostatically repelled by the sorbent, higher ionic strengths increase adsorption, and for electrostatic attraction higher ionic strengths decrease adsorption.
authors.affiliation: Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, 6703 HB Wageningen, The Netherlands. marjin.vanderveen@wur.nl
authors.forename: Marijn
authors.initials: M
authors.lastname: van der Veen
authors.forename: Willem
authors.initials: W
authors.lastname: Norde
authors.forename: Martien Cohen
authors.initials: MC
authors.lastname: Stuart
mesh_terms: D000327:Adsorption; D006863:Hydrogen-Ion Concentration; D009113:Muramidase / Q000737:chemistry*; D009994:Osmolar Concentration; D011506:Proteins / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D055672:Static Electricity; D013386:Succinates / Q000737:chemistry*; D013499:Surface Properties; D013997:Time Factors
chemical_list: D011506:Proteins; D013386:Succinates; D012822:Silicon Dioxide; D009113:Muramidase