Abstract
A photo-crosslinkable resin, BIX12, was selected from among various photo-crosslinkable resins for the immobilization of animal cells. BIX12 had no cytotoxic effect on the growth of hybridoma cells and the production of monoclonal antibody, although other photo-crosslinkable resins had significant inhibitory effects. Using BIX12-alginate hybrid gel particles, hybridoma cells could grow in the resins and produce monoclonal antibody. For the continuous production of monoclonal antibody, perfusion culture using a fluidized-bed bioreactor with direct air bubbling was carried out. By this cultivation, monoclonal antibody could be produced stably for more than 50 d. A high viable cell density of more than 10 7 cells/ml-gel was attained, and the antibody productivity was improved 8.5-fold compared with conventional suspension culture using a spinner flask. Anchorage-dependent cells were also immobilized in the resin particles by three immobilization procedures. Among these procedures, porous BIX12 formed by adding gelatin powder provided good support strength and allowed the cells to grow on the surface inside of the support.
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