Abstract
The performance of packed bed (PBR) and modified bubble tank (MBTR) reactors was compared with respect to recombinant protein (β-galactosidase) production by suspended and immobilized E. coli. The MBTR was superior to the PBR due to easy operation and higher protein production. Gas-liquid mass transfer was not affected by the presence of gel beads, and there were no internal or external oxygen diffusion limitations in either reactor. High substrate concentration, small bead size, low cell densities, and similar values of effective diffusion coefficient of oxygen in water and in alginate may have decreased the internal mass transfer limitations.
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