How should ammonium sulphate enzyme suspensions be made soluble?

The enzyme is supplied as an insoluble precipitate in ammonium sulphate so can be centrifuged to pellet the enzyme then re-suspended in an appropriate buffer used in the subsequent assay. Alternatively, the enzyme suspension can be mixed to become a uniform suspension immediately prior to aspirating then added directly to the assay buffer where it will readily become soluble assuming it is a high enough dilution e.g. 10-fold.