1,000 units/mg of protein. Unit definition: That amount of enzyme catalyzing the liberation of 1 umole p-nitrophenol per minute at 37°C and pH 9.8 in DEA buffer.
Storage Buffer:
Lyophilized from Tris buffer containing Mg and Zn
Storage Instruction:
Store at -20°C. For best storage after opening, redesiccate over silica gel under vacuum before returning to -20°C.