The enzymes are very stable. In fact on storage at room temperature for 10 months, the decrease in activity of thermostable alpha-amylase and amyloglucosidase is less than 10% and the decrease in activity in protease is about 40%. When stored at 4˚C, the enzymes are stable for about 5 years, and at -20˚C they are stable for more than 10 years.

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