lyophilized powder, 100-300 units/mg protein (biuret)

5-10 units/mg protein

powder, brown, >0.5 U/mg

≥50 U/g moist material

Grade I, lyophilized powder, ≥1500 units/mg protein

Grade II, salt-free, lyophilized powder, 500-1,500 units/mg protein

Grade VII, lyophilized powder, 500-1,500 units/mg protein

Grade V, lyophilized powder, 50-200 units/mg protein