Human HBsAg (Active)

Recombinant human Hepatitis B surface antigen (HBsAg) supplied by Antibodies.com as an unconjugated liquid preparation at 1 mg total protein. The antigen is supplied in active form, retaining native conformational epitopes required for binding by anti-HBs antibodies, and is intended as an immunogenic reference reagent rather than a denatured peptide standard.

The product corresponds to the small (S) surface protein of HBV, a roughly 24 kDa polypeptide that spontaneously assembles into 22 nm subviral particles displaying the major 'a' determinant epitope recognized by neutralizing antibodies. Researchers employ active recombinant HBsAg in immunoassays, immunogenicity studies, vaccine formulation screening, and as a coating antigen for anti-HBs immunoglobulin quantification workflows.

Upon receipt, aliquot the liquid preparation into single-use volumes to limit repeated freeze-thaw cycles, and store frozen at -20 degrees C (or lower for long-term archiving) to preserve antigenic activity. For research use only; not intended for diagnostic or therapeutic applications.