A new low cost magnetic material: magnetic polyvinylbutyral microbeads

In this work, new and feasible magnetic particles were prepared in uniform and spherical form for a diameter range of 125 to 250 mu m from a commercia l resin Mowital(R) B30HH (polyvinyl butyral) through a modified solvent eva poration technique. For the production of particles, the most appropriate s olvent, stabilization and surface active agents, and stirring rate were det ermined as chloroform, SDS, pluronic F68 together with PVA and 700 rev./min , respectively. The magnet abundant in nature, magnetite (mean diameter < 4 0 mu m), was successfully embedded in the particle structure during polymer ization by an elaborate technique and spherical particles with high magneti c quality were realized for possible magnetically fluidized bed or magnetic filtration applications. FTIR studies proved the abundance of hydroxyl gro ups on the particle surface, which were activated later by glutaraldehyde f or bioaffinity separations. Preliminary adsorption runs were conducted with magnetic and non-magnetic microbeads for bovine serum albumin which result ed in remarkable adsorption capacities as high as 86 mg protein per g of ma gnetic microbeads. (C) 2000 Elsevier Science B.V. All rights reserved.