Abstract
A new method for covering magnetic particles with a stable non-porous layer of a material like zeolite or activated carbon was used for the preparation of support materials with good properties for the immobilization of yeast Saccharomyces cerevisiae cells. The immobilized cells can be used in batch and continuous alcoholic fermentation. A productivity of 35.6 g ethanol/ l · h was reached. The adsorption isotherms of the immobilized yeast cells were determined. Yeast cell immobilization on non-porous magnetic supports obeyed the Langmuir isotherm equation. Satisfactory results were obtained also from repeated batch fermentations with fixed cells on supports additionally treated with glutaraldehyde or by simple adsorption.
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