Pricing & Availability
Regulatory Status
Other Names
SARS-CoV-2 spike protein, 2019-nCoV, severe acute respiratory coronavirus 2 spike glycoprotein S1, SARS-CoV-2 S1 Subunit, 2019 novel coronavirus S1 protein, RBD, receptor-binding domain
Ave. Rating
Submit a Review
Product Citations
  • LEGENDMAX_SARS-CoV-2_Spike_RBD_IgM_052821.png
Cat # Size Price Save
448307 1 Pre-coated Plate ¥109,340

SARS-CoV-2 is an enveloped non-segmented positive-sense RNA coronavirus that infects the human respiratory-epithelial cells, and is the cause of the coronavirus disease 2019 (COVID-19). One of its structural proteins includes the spike protein (S). The S protein consists of the S1 subunit which contains a receptor binding domain (RBD) that is capable of recognizing and binding with the cell surface receptor, and playing a key role in viral entry. Assays to detect virus-specific antibodies are important to understand the prevalence of infection and the course of the immune system.

The BioLegend LEGEND MAX™ SARS-CoV-2 Spike RBD Human IgM ELISA Kit is an Enzyme-Linked Immunosorbent Assay (ELISA) with a 96-well strip plate that is pre-coated with SARS-CoV-2 Spike Protein RBD. This kit is specifically designed for the accurate quantitation of SARS-CoV-2 Spike RBD Human IgM from serum and plasma. It is analytically validated with ready-to-use reagents.

Product Details
Technical data sheet

Kit Contents

Kit Contents
  • SARS-CoV-2 Spike RBD Human IgM Pre-coated 96-well Strip Microplate
  • SARS-CoV-2 Spike RBD Human IgM Detection Antibody
  • SARS-CoV-2 Spike RBD Human IgM lyophilized Standard
  • Avidin-HRP
  • Assay Buffer B
  • Wash Buffer (20X)
  • Substrate Solution F
  • Stop Solution
  • Plate Sealers

Product Details

Verified Reactivity


0.087 ± 0.01 pg/mL
Standard Range
0.489 - 30 ng/mL
Materials Not Included
  • Microplate reader able to measure absorbance at 450 nm
  • Adjustable pipettes to measure volumes ranging from 1 μL to 1,000 μL
  • Deionized water
  • Wash bottle or automated microplate washer
  • Log-Log graph paper or software for data analysis
  • Tubes to prepare standard dilutions
  • Timer
  • Polypropylene vials

Antigen Details

Biology Area
Adaptive Immunity, Bacterial proteins and Toxins, Immunology
Gene ID
View information about IgM on UniProt.org

Related FAQs

In your LEGEND MAX™ ELISA Kits, there is a step that calls for washing the plates before adding sample. What is the purpose of this step?

We typically use a stabilizer for pre-coated plates. The additional washing step is designed to remove these components before you start the assay. If you do not perform the washing, the effect on assay performance is negligible.

I have multiple LEGEND MAX™ ELISA kits that I want to run simultaneously. Can I use the same wash buffer for all the kits?

The wash buffer provided in all our LEGEND MAX™ kits is the same and the part numbers on the wash buffer bottles in these kits should be identical. For ELISA MAX™ Deluxe and ELISA MAX™ Standard Sets, we provide a recipe for the wash buffer on each kit’s technical data sheet. This recipe is the same for all ELISA MAX™ sets.

For some of your ELISA kits, why do my serum samples require dilution with assay buffer?

In some cases, dilution with assay buffer is required to minimize the matrix difference between the samples and the standards to achieve better accuracy.

Go To Top Version: 1    Revision Date: 05/28/2021

For Research Use Only. Not for diagnostic or therapeutic use.


This product is supplied subject to the terms and conditions, including the limited license, located at www.biolegend.com/terms) ("Terms") and may be used only as provided in the Terms. Without limiting the foregoing, BioLegend products may not be used for any Commercial Purpose as defined in the Terms, resold in any form, used in manufacturing, or reverse engineered, sequenced, or otherwise studied or used to learn its design or composition without express written approval of BioLegend. Regardless of the information given in this document, user is solely responsible for determining any license requirements necessary for user’s intended use and assumes all risk and liability arising from use of the product. BioLegend is not responsible for patent infringement or any other risks or liabilities whatsoever resulting from the use of its products.


BioLegend, the BioLegend logo, and all other trademarks are property of BioLegend, Inc. or their respective owners, and all rights are reserved.


8999 BioLegend Way, San Diego, CA 92121 www.biolegend.com
Toll-Free Phone: 1-877-Bio-Legend (246-5343) Phone: (858) 768-5800 Fax: (877) 455-9587


Login / Register
Remember me
Forgot your password? Reset password?
Create an Account