≥2 U/mg

ammonium sulfate suspension, 5.0-20.0 units/mg protein (biuret)

≥0.1 unit/mg solid

<0.005 unit/mg solid (without pyridoxal 5-phosphate), ≥0.05 unit/mg solid (with excess pyridoxal 5-phosphate)

lyophilized powder, ≥100 units/mg solid

partially purified powder, 0.01-0.1 unit/mg solid

ammonium sulfate suspension, 80-240 units/mg protein (biuret)

lyophilized powder, ≥8.0 units/mg protein