Hi everyone

I am working with enzyme immobilization. I made the immobilization using 10 mg of support with 23000 Units/L of activity, then I recovery from the supernatant almost 70000 units, so my immobilization yield is almost 71 %. Now I want to determine the storage stability over a time period but I don’t understand the protocol. What I did was to storage the immobilized solid suspension at 4 degrees and then I determine the activity every 4 days. But for example, first Activity of the suspension was 5 U/L, then 8, then 10, then 14… how do I determine the storage stability using a relative residual activity?