title: Evaluation of protein separation mechanism and pore size distribution in colloidal self-assembled nanoparticle sieves for on-chip protein sizing.
abstract: The separation behavior of 6.5-66 kDa proteins in silica particle array-based sieves formed by colloidal self-assembly in microchips is reported across a pore size range of 22-103 nm. The protein separation and resolution improves markedly with decreasing pore size. The variation of electrophoretic mobility with molecular weight of SDS-protein complexes and with particle size was evaluated using the Ogston sieving equation for a random pore gel structure, and using the modified Giddings equation developed by Wirth for uniform pore structures. The Wirth/Giddings equation provides the best fit for estimation of molecular weight of proteins, and demonstrates that even though experimental evidence shows there is some dispersion in measured pore sizes, these structures can best be described as having a uniform pore size.
authors.affiliation: Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Azim
authors.affiliation: Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada.
authors.forename: Ali
authors.initials: A
authors.lastname: Malekpourkoupaei
authors.affiliation: Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada.
authors.forename: Wenmin
authors.initials: W
authors.lastname: Ye
authors.affiliation: National Institute for Nanotechnology, NRC, Edmonton, Alberta, Canada.
authors.forename: Abebaw B
authors.initials: AB
authors.lastname: Jemere
authors.affiliation: Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada.|National Institute for Nanotechnology, NRC, Edmonton, Alberta, Canada.
authors.forename: D Jed
authors.initials: DJ
authors.lastname: Harrison
mesh_terms: D046210:Microfluidic Analytical Techniques / Q000379:methods*; D049329:Nanostructures / Q000737:chemistry*; D010316:Particle Size; D016062:Porosity; D040081:Protein Array Analysis / Q000379:methods*; D011506:Proteins / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D011506:Proteins
keywords: Colloidal Self Assembly; Microfluidics; Nanofluidics; Nanoporous media; Protein Separation