title: Development and application of thermo-sensitive magnetic immunomicrospheres for antibody purification.
abstract: Ultrafine magnetite particles were prepared by a co-precipitation method. The poly-(styrene/N- isopropylacrylamide/methacrylic acid) latex particles containing ultrafine magnetite [magnetic P(St/NIPAM/MAA)] were prepared by two-step emulsifier-free emulsion polymerization. The minimum NaCl concentration for flocculation of these magnetic latex particles (critical flocculation concentration, CFC) decreased with increasing temperature. These temperature dependence of CFC, namely its thermo-sensitivity, originated from NIPAM. At a certain NaCl concentration, some of the magnetic latex particles showed reversible transition between flocculation and dispersion by controlling the temperature, and the thermo-flocculated magnetic latex particles were separated quickly in a magnetic field. Bovine serum albumin (BSA) was covalently immobilized onto the magnetic P(St/NIPAM/MAA) latex particles with high efficiency by the carbodiimide method. These thermo-sensitive magnetic immunomicrospheres were effective for the immunoaffinity purification of anti-BSA antibodies from antiserum.
authors.affiliation: Applied Chemistry Department, Kyushu Institute of Technology, Kitakyushu, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Kondo
authors.forename: H
authors.initials: H
authors.lastname: Kamura
authors.forename: K
authors.initials: K
authors.lastname: Higashitani
mesh_terms: D000906:Antibodies / Q000302:isolation & purification*; D005427:Flocculation; D006863:Hydrogen-Ion Concentration; D018189:Immunomagnetic Separation / Q000379:methods*; D008863:Microspheres; D009994:Osmolar Concentration; D012710:Serum Albumin, Bovine; D013696:Temperature
chemical_list: D000906:Antibodies; D012710:Serum Albumin, Bovine