Excessive Signal Amplification in Detection System (ELISA (High Background))

Question

Accepted Answer

Very high signals across all wells including low-concentration standards. Loss of discrimination between different antigen concentrations. Background approaches signal levels. Common causes: 1) Biotin-to-antibody ratio too high in conjugated secondary antibody 2) Excessive avidin-enzyme conjugate concentration 3) Multiple amplification layers causing signal over-amplification 4) Amplification reagent incubation time too long Solutions: 1) Reduce biotin-to-antibody ratio when conjugating secondary antibody 2) Dilute amplification reagents (streptavidin-HRP, avidin-enzyme conjugates) 3) Decrease incubation time for amplification steps 4) Consider switching to direct detection without amplification