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Anti igg2b biotin

Manufactured by Southern Biotech

Anti-IgG2b-biotin is a laboratory reagent used as a detection antibody in various immunoassays. It binds to the IgG2b subclass of immunoglobulins and is conjugated with biotin, allowing for further detection and signal amplification.

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2 protocols using anti igg2b biotin

1

Measuring SARS-CoV-2 Antibody Titers

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IgG endpoint titers to mammalian-derived SARS-CoV-2 S, S1, S2 and RBD in sera at day 30 post-immunization were measured by Luminex immuno-assay. Assay was conducted as described above, with the modification of serially diluting serum 10-fold from 200 to 2 × 108. Similarly, IgG subclass endpoint titers (i.e., IgG1 and IgG2a in BALB/c and IgG1 and IgG2c in C57BL/6) were measured against mammalian-derived SARS-CoV-2 S protein, using serially diluted mouse sera (5-fold from 200 to 3.1 × 106) and secondary antibodies anti-IgG1-biotin, anti-IgG2a-biotin, or anti-IgG2b-biotin (SouthernBiotech). Four parameter logistic (4PL) curves were fitted to the measured MFI data from serially diluted sera, and three times the background (i.e., 3 × MFI with no serum) was used as a threshold cutoff to estimate endpoint titers.
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2

ELISA for Anti-Nuclear Antibodies

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Immulon 4HBX high binding plates (ThermoFisher, Rockford, IL) were used for ELISA assays. For ANA ELISAs, plates were coated with a 1:10 dilution of poly-L-lysine (Sigma-Aldrich, St. Louis, MO), followed by coating with salmon sperm dsDNA (Sigma-Aldrich, St. Louis, MO) or Smith/Ribonucleoprotein SmRNP (Arotec Diagnostics, Wellington, New Zealand). Plates were blocked with 4% non-fat dry milk in PBS and coated with diluted serum samples with serial double dilution. Detection of antibody subtypes was performed using the following combinations of primary and secondary detection antibodies: primary- anti-IgG-biotin (Jackson ImmunoResearch, West Grove, PA), anti-IgG2b-biotin (Southern Biotech, Birmingham, AL), anti-IgG2c-alkaline phosphatase (Southern Biotech, Birmingham, AL) and secondary- streptavidin-alkaline phosphatase (Vector Laboratories, Burlingame, CA). Plates were developed with PNPP (p-nitrophenyl phosphate, disodium salt) (ThermoFisher, Rockford, IL) substrate and quantitation was performed as previously described [50 (link)]. Anti-DNA or anti-SmRNP IgG-subclass titers were determined by calculating arbitrary units by using serial dilution of the serum from a positive animal as a standard, and were expressed as units per volume.
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