Now, once we know the enzyme activity, we can then calculate what our concentration of that protein is and once we know what the enzyme activity and the concentration of that protein, that enzyme, in this case lactate dehydrogenase we can then calculate the specific activity, because the specific activity is the ratio of the enzyme activity to the concentration of that protein. So enzyme activity divided by amount of enzyme. So what exactly is this value? Well, the value tells us the moles of product produced over some time period per amount of enzyme found inside that particular sample. Now what this can be used for is when we actually know. So following the assay, when we know that inside our sample we have our protein, we can then begin the purification process.