内毒素:Less than 1.0 EU/ug as determined by LAL method.
生物活性:①Measured by its binding ability in a functional ELISA. Immobilized SARS-CoV S-RBD at 2 μg/ml can bind Paguma larvata ACE2, the EC50 is 5.056-7.559 ng/ml.②Recombinant Paguma larvata ACE2 protein enzyme activity is measured by its ability to cleave fluorogenic peptide substrate(Mca-Ala-Pro-Lys(Dnp)-OH), The Km is 22.84 μM.