SARS-CoV-2 Nucleoprotein ELISA Kit

Principle of the Assay

This assay employs the quantitative sandwich enzyme immunoassay technique. A monoclonal antibody specific for SARS-CoV-2 Nucleoprotein has been pre-coated onto a microplate. Standards and samples are pipetted into the wells, and then a horseradish peroxidase-conjugated detection antibody specific for SARS-CoV-2 Nucleoprotein is added to the wells, producing an antibody-antigen-antibody "sandwich complex". Following incubation and wash steps a substrate is added. A colored product is formed in proportion to the amount of SARS-CoV-2 Nucleoprotein present in the sample. The reaction is terminated by the addition of acid and absorbance is measured at 450nm. A standard curve is prepared from six SARS-CoV-2 Nucleoprotein standard dilutions and SARS-CoV-2 Nucleoprotein sample concentration determined.

Target Information

Coronaviruses are enveloped viruses with a positive-sense RNA genome and with a nucleocapsid of helical symmetry. Coronavirus nucleoproteins localize to the cytoplasm and the nucleolus, a subnuclear structure, in both virus-infected primary cells and in cells transfected with plasmids that express N protein. Coronavirus N protein is required for coronavirus RNA synthesis and has RNA chaperone activity that may be involved in template switch. Nucleocapsid protein is the most abundant protein of coronavirus. During virion assembly, N protein binds to viral RNA and leads to the formation of the helical nucleocapsid. Nucleocapsid protein is a highly immunogenic phosphoprotein also implicated in viral genome replication and in modulating cell signaling pathways. Because of the conservation of the N protein sequence and its strong immunogenicity, the N protein of coronavirus is chosen as a diagnostic tool.

Materials Supplied

Kit Components 96 Wells Quantity/Size
Aluminum pouches with a Microwell Plate coated with monoclonal antibody to SARS-CoV-2 Nucleoprotein (8×12)
1 plate
SARS-CoV-2 Nucleoprotein standard, 25ng/ml
2 vials
Concentrated Detection antibody conjugated to horseradish peroxidase (HRP)
2 vials
Standard /sample Diluent
1 bottle
Detection antibody Diluent
1 bottle
Wash Buffer Concentrate 20x (PBS with 1% Tween-20) 1 bottle
Substrate Solution 1 bottle
Stop Solution 1 bottle
Adhesive Films 4 pieces
Product data sheet 1 copy


Storage Store at 2 - 8°C

Performance Characteristics

REPEATABILITY The coefficient of variation of both intra-assay and inter-assay was less than 10%.
SENSITIVITY The minimum detectable dose was 0.4ng/mL.
SPECIFICITY This assay can recognize both recombinant and natural SARS-CoV-2 Nucleoprotein,but will not react with recombinant MERS-CoV Nucleoprotein.