[en] A study on industrial glucoamylase irradiated by ⁶⁰Co gamma-rays showed that an obvious change took place in the ultraviolet absorption spectrum and the pH-value of the enzyme solution. The activity of the enzyme preparation was much more resistant to irradiation than that of microbes contained in the preparation. The result indicates that irradiated glucoamylase preparation is not only favourable to activity preservation but is improved in hygienic quality. A comparison of the various properties of irradiated enzyme preparation with those of unirradiated ones has proved that irradiation does not change the normal application of glucoamylase preparation. (author)