Protocol: ADA Bridging ELISA for Use with Anti-Tocilizumab Antibodies

Protocol: ADA Bridging ELISA for Use with Anti-Tocilizumab Antibodies

Protocol: ADA Bridging ELISA For Use With Anti-Trastuzumab Antibody

Protocol: ADA Bridging ELISA for Use with Anti-Tocilizumab Antibodies

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Anti-Drug Antibody (ADA) Bridging ELISA: for Use with Anti-Tocilizumab Monoclonal Antibodies HCA253, HCA254, HCA255 and HCA256

This method provides a procedure for generating an ADA ELISA standard curve with an Anti-Tocilizumab Antibody, catalog number HCA253, HCA254, HCA255 or HCA256 using tocilizumab antibody for capture and detection. The method should always be used in conjunction with product and batch specific information provided with each vial (see product datasheets). This protocol will need to be adjusted for use with different detection methods and immunoassay technology platforms


HISPEC Assay Diluent (BUF049)
Human Serum (Sigma-Aldrich, H4522)
LYNX Rapid HRP Antibody Conjugation Kit (LNK001P-LNK006P)
136 mM NaCl
2.68 mM KCl
8.1 mM Na2HPO4
1.46 mM KH2PO4
PBS with 0.05% Tween 20
QuantaBlu Fluorogenic Peroxidase Substrate (Thermo Fisher Scientific, 15169)


384-well microtiter plate, black, square flat-bottom wells, for example, Black 384-Well Immuno Plates (Thermo Fisher Scientific, 460518)
Fluorescence plate reader
96-well plates can be used instead of 384-well plates, (black, flat-bottom wells) for example, Black 96-Well Immuno Plates (Thermo Fisher Scientific, 437111). For the 96-well format, use 100 μl (instead of 20 μl) of antigen, antibodies, or substrate and 300 μl for the blocking step.


  1. Prepare detection antibody: conjugate tocilizumab antibody using a LYNX Rapid HRP Antibody Conjugation Kit.
  2. Prepare the unconjugated tocilizumab capture antibody at 1 μg/ml in PBS. Coat the required number of wells of a 384-well microtiter plate with 20 μl per well of the prepared capture antibody, and incubate overnight at 4°C.
  3. Wash the microtiter plate five times (5x) with PBST.
  4. Block the microtiter plate by adding 100 μl 5% BSA in PBST to each well, and then incubate for 1 hr at RT.
  5. Wash the microtiter plate 5x with PBST.
  6. For the standard curve, prepare a dilution series of an Anti-Tocilizumab Antibody HCA253 (AbD21338_hIgG1), HCA254 (AbD21364_hIgG1), HCA255 (AbD21346_hIgG1) or HCA256 (AbD21345_hIgG1) in 10% human  serum in PBST in triplicate. Final concentration of anti-tocilizumab antibody should cover the range from 0.1 ng/ml to 10,000 ng/ml. Include a zero anti-tocilizumab antibody concentration as the background value.
  7. Add 20 μl of anti-tocilizumab antibody dilution per well (in triplicate for each standard recommended) and incubate for 1 hr at RT.
  8. Wash the microtiter plate 5x with PBST.
  9. To each well add 20 μl HRP conjugated tocilizumab diluted to 2 μg/ml in HISPEC Assay Diluent and incubate for 1 hr at RT.
  10. Wash the microtiter plate 10x with PBST.
  11. Add 20 μl QuantaBlu Fluorogenic Peroxidase Substrate to each well and measure the fluorescence after 30 min.