Real lab failures, root causes, and fixes — curated and bilingually annotated by our team.
High background signal observed in immunoprecipitation experiments where multiple non-target protein bands appear in the eluate, indicating poor antibody specificity.
High background with smeared or degraded protein bands in IP eluate, often accompanied by loss of target protein signal. Multiple lower molecular weight bands appear below the expected target band.
Persistent high background with many non-specific protein bands in IP eluate despite following standard protocol, indicating residual unbound proteins remain on beads.
Multiple protein bands appear in IP eluate that are not related to the target antigen, indicating proteins binding non-specifically to the antibody Fc region or other antibody domains.
High background caused by non-specific proteins binding directly to the bead matrix surface rather than the antibody, appearing as multiple bands in negative controls with beads alone.
Excessive background signal with numerous protein bands in eluate due to using too many cells or too much lysate protein, overwhelming the antibody-bead binding capacity.
High background observed when using too much antibody in the IP reaction, leading to increased non-specific protein interactions and higher background in the eluate.
High background in IP eluate with particulate matter visible, caused by insoluble proteins or cellular debris contaminating the soluble lysate supernatant.
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