Abstract
Escherichia coli K-12 cells having tryptophanase activity could be readily adsorbed to the surface of commercial ceramic powders such as γ-alumina, silica, titania, zirconia or glass, when they were suspended in a neutral or alkaline buffer solution in the presence of poly(methacryl-oxyethyl trimethyl ammonium chloride) (PMAAC), a cationic flocculant. Tryptophanase activity of the cells treated with PMAAC was somewhat less than that of the untreated cells, however, the activity of the cells adsorbed to titania, zirconia or glass powder after five recyclings was appreciably more stable than that of the intact cells.
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