title: Molecular sieving of polystyrene carboxylate of a diameter up to 10 microns in solutions of uncrosslinked polyacrylamide of M(r) 5 x 10(6) using capillary zone electrophoresis.
abstract: Capillary zone electrophoresis of polystyrene carboxylate (PSC) up to 10 microns in diameter in 0.1 to 0.9% solutions of uncrosslinked polyacrylamide (PA) of M(r) 5 x 10(6) demonstrates effective molecular sieving in that medium. The reduced mobility, however, is not constant in Tris-borate-EDTA (1x TBE) buffer containing the polymer but increases in proportion to the load of PSC and inversely to the concentration of PA unless the TBE concentration is increased 10-fold or 50 mM 3-[(3-cholamidopropyl)dimethylammonio]propanesulfonic acid is added to the solution or in the absence of PA. Both the Ferguson plots [log(mobility) vs PA concentration] of PSC obtained at various PSC loads and the effects of the dissociating conditions, high ionic strength and detergent, signify that the variable mobilities are those of different PSC aggregation states. Thus, only the fully associated or dissociated states of PSC provide mobilities that are constant independently of PSC load. The study shows that the information inherent in Ferguson plots regarding particle and fiber properties can be exploited for particles up to 10 microns in diameter by capillary zone electrophoresis in polymer solutions even if these particles form various aggregation states. Thus, such an analysis appears feasible in application to biologically relevant and functional complexes such as subcellular-sized particles or DNA-protein complexes, providing that these particles maintain their integrity and functionality under the selected electrophoretic conditions.
authors.affiliation: Section on Macromolecular Analysis, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892-0001.
authors.forename: S P
authors.initials: SP
authors.lastname: Radko
authors.forename: M M
authors.initials: MM
authors.lastname: Garner
authors.forename: G
authors.initials: G
authors.lastname: Caiafa
authors.forename: A
authors.initials: A
authors.lastname: Chrambach
mesh_terms: D000180:Acrylic Resins; D003902:Detergents / Q000494:pharmacology; D004586:Electrophoresis; D009994:Osmolar Concentration; D010316:Particle Size; D011137:Polystyrenes / Q000032:analysis*; D014783:Viscosity; D000099166:Polyacrylamides
chemical_list: D000180:Acrylic Resins; D003902:Detergents; D011137:Polystyrenes; D000099166:Polyacrylamides