Suboptimal Antigen Retrieval Method Selection (Immunohistochemistry (CST Guide))

Question

Accepted Answer

Weak or absent staining despite proper antibody concentration and incubation. Clear performance differences observed when comparing different antigen retrieval heating methods. Common causes: 1) Water bath used for antigen unmasking (not recommended method) 2) Heating method incompatible with specific tissue type or antigen target 3) Antigen unmasking buffer not optimized for specific tissue or target protein 4) Using old or improperly prepared 1X antigen retrieval solutions instead of fresh daily preparations Solutions: 1) Use microwave oven for antigen retrieval (preferred method over water bath) 2) For certain tissues/antigens requiring enhanced signal, use pressure cooker instead of microwave 3) Follow CST product-specific datasheet for recommended antigen unmasking buffer and protocol 4) Prepare fresh 1X antigen retrieval solutions daily; do not reuse or store diluted buffers