title: Isoelectric membrane simulator: a computational approach for isoelectric immobiline membranes.
abstract: Isoelectric membrane simulator (IMS) is a computer program meant for computation of pH, buffering power (beta), ionic strength (I) and dissociation degree (a) of a mixture of up to 3 buffering and 1 titrant Immobilines, for generating in a reproducible manner isoelectric membranes. Such membranes, of precise isoelectric point, are then used for large-scale protein purification by isoelectric focusing in multicompartment electrolyzers. IMS can be used, in a more general application, for titrating mixtures of buffers to a desired pH value. This versatile program is written in M.Q.BASIC rel. 2.5 and it runs on any IBM hardware or compatible machine supported by MS-DOS. An example of purification of superoxide dismutase in a multicompartment electrolyzer with a set of fixed pI membranes of widely differing composition is shown.
authors.affiliation: Department of Biomedical Sciences and Technologies, University of Milano, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Tonani
authors.forename: M
authors.initials: M
authors.lastname: Faupel
authors.forename: P G
authors.initials: PG
authors.lastname: Righetti
mesh_terms: D000178:Acrylamides; D004572:Electrolysis; D006863:Hydrogen-Ion Concentration; D007525:Isoelectric Focusing; D008567:Membranes, Artificial; D012984:Software; D013482:Superoxide Dismutase / Q000737:chemistry
chemical_list: D000178:Acrylamides; D008567:Membranes, Artificial; C059413:Immobiline; D013482:Superoxide Dismutase