Abstract
A method for immobilizing yeast cells (Saccharomyces cerevisiae) possessing invertase activity by direct adhesion on tuff granules coated with insolubilized gelatin is described. The immobilized cells, firmly fixed as a monolayer onto the surface of the support granules display catalytic properties (in terms of apparent Km) close to free cells and are particularly suitable for continuous sucrose hydrolysis in a fixed-bed reactor. From an industrial point of view, the immobilization method described here has two advantages over other immobilization methods, i.e. the immobilized yeast cells have a fairly good operational stability and their proliferation on tuff granules can be controlled.
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