buffered aqueous suspension, 1,000-2,000 units/mg protein (E1%/280)

powder, light brown, ≥10 U/g

lyophilized, powder, ≥150 U/mg

lyophilized, powder, beige, ~150 U/mg

lyophilized powder (essentially salt-free), ≥200 units/mg protein

lyophilized powder, ≥50 units/mg protein

Highly stabilized, essentially salt-free, lyophilized powder, 200-300 units/mg solid (using pyrogallol)

Type X, ammonium sulfate suspension