①Measured by its binding ability in a functional ELISA. Immobilized SARS-CoV-2-S1-RBD at 2 μg/ml can bind SARS-CoV-2-S Antibody , the EC50 of SARS-CoV-2-S1-RBD protein is 27.96 - 33.35 ng/ml.
②Measured by its binding ability in a functional ELISA. Immobilized SARS-CoV-2-S1-RBD at 2 μg/ml can bind SARS-CoV-2-S Antibody , the EC50 of SARS-CoV-2-S1-RBD protein is 13.96 -16.62 ng/ml.
③Measured by its binding ability in a functional ELISA. Immobilized SARS-CoV-2-S1-RBD at 5 μg/ml can bind human ACE2 , the EC50 is 2.785-9.139 ng/ml.
④SARS-CoV-2 Spike protein RBD his/myc tag captured on COOH chip can bind Human ACE2 protein Fc tag with an affinity constant of 13.8 nM as detected by LSPR Assay.
⑤Measured by its binding ability in a functional ELISA. Immobilized SARS-CoV-2-S1-RBD at 2 μg/ml can bind Biotinylated human ACE2 , the EC50 is 4.599-8.322 ng/ml.