Hello

I am performing antioxidant assays ( ApX, GPX, SOD, CAT) in wheat crop.I have extracted the crude enzyme using phosphate buffer, and as per protocol of antioxidants, we can crush the samples using phosphate buffer and supernatant can serve as common enzyme extract for all the assays. In a single day it becomes bit difficult to take the readings of all assays. Can we store the crude enzyme extract in -20 and later use it for antioxidant assays?