The Human Coronavirus Ig Total 11-Plex ProcartaPlex Panel enables screening of four anti-SARS-CoV-2 antibodies (Spike trimer, S1 subunit, RBD (receptor binding domain), and Nucleocapsid), six anti-coronavirus strains (SARS-CoV-1, MERS, CoV-NL63, CoV-KHU1, CoV-229E, CoV-OC43 ), and one negative control in a single well using Luminex xMAP technology. Simultaneous detection of anti-SARS-CoV-2 antibodies and related coronavirus antibodies in one assay can save time to provide a complete, holistic data set of serum samples.

Unlike most ProcartaPlex kits that utilize matched antibody pairs to detect proteins of interest, this serological assay is designed with specific SARS-CoV-2 proteins conjugated to the bead. The detector antibody is an Immunoglobulin (Ig) Total antibody directly conjugated to phycoerythrin (PE) that cross-reacts with all Ig (IgG, IgM, and IgA) in serum. IgG is the most abundant of the immunoglobulins.

The panel is provided in a ready-to-use format and the total incubation time is 2.5 hours. The kit comes with two vials each of high, medium, and low controls to be run either as controls or the high control can be serially diluted to generate a standard curve. Serum and plasma samples are recommended to be diluted 1:1000. It is not combinable with simplexes or other panels.

ProcartaPlex preconfigured panels are extensively tested for analyte combinability, interference, and cross-reactivity to provide the highest level of validation and precision. All ProcartaPlex panels are supplied with the necessary reagents to perform the assay.

Target list [bead region]: SARS-CoV-2 Spike (trimer) [14], SARS-CoV-2 S1 protein [15], SARS-CoV-2 RBD (IAP) [75], SARS-CoV-2 Nucleocapsid [13], SARS S1 [67], CoV-NL63 [39], CoV-HKU1 [30], CoV-229E [26], MERS S1 [46], CoV-OC43 [37], Negative control [52]

About ProcartaPlex assays for the Luminex platform
ProcartaPlex immunoassays are based on the principles of a sandwich ELISA, using two highly specific antibodies binding to different epitopes of one protein to quantitate all protein targets simultaneously using a Luminex instrument. ProcartaPlex multiplex assays require as little as 25 µL of plasma or serum, or 50 µL of cell culture supernatant, and just four hours to obtain analyzed results.

• Reproducible, reliable results—validated as a panel to the highest industry standard, including protein target combinability and cross-reactivity testing
• More results per sample—measure multiple protein targets simultaneously in a single 25–50 µL sample
• Well-established Luminex technology—the most referenced multiplexing platform for protein detection and quantitation

ProcartaPlex assays utilize Luminex xMAP (multianalyte profiling) technology for the simultaneous detection and quantitation of up to 80 protein targets in a single 25–50 µL sample—from plasma, serum, cell culture supernatants, and other bodily fluids.

The Luminex MagPlex superparamagnetic microsphere beads in the ProcartaPlex assay are internally dyed with precise proportions of red and infrared fluorophores to create 100 spectrally unique signatures that can be identified by the Luminex xMAP detection systems (Luminex 200, FLEXMAP 3D, and MAGPIX systems). Similar to a sandwich ELISA, the ProcartaPlex assay uses matched antibody pairs to identify the protein of interest. In a multiplexed assay, each spectrally unique bead is labeled with antibodies specific for a single target protein, and bound proteins are identified with biotinylated antibodies and streptavidin–R-phycoerythrin (RPE). The conjugation of protein-specific antibodies to a distinct bead allows for analysis of multiple targets in a single well.

The most significant difference between a ProcartaPlex assay and ELISA is that the capture antibody in the ProcartaPlex assay is conjugated to a magnetic bead and not adsorbed to the microplate well, so the ProcartaPlex assay reagents are free-floating in the solution. For detection, the Luminex 200 instrument, for example, contains two lasers, one to distinguish the spectral signature of each bead and the second to quantify the amount of RPE fluorescence, which is proportional to the amount of protein present in the sample. ProcartaPlex multiplex assays can profile more target proteins using significantly less sample in the same time that it takes to perform a traditional sandwich ELISA.

ProcartaPlex multiplex panels are available in multiple formats across six species (human, mouse, rat, nonhuman primate, porcine, and canine). Visit thermofisher.com/procartaplex for more information and available products.