Antigen Retrieval Method Not Optimized for Target (Immunohistochemistry (CST Guide))

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Accepted Answer

Staining results are inconsistent or suboptimal despite correct antibody and detection system, with signal strength varying significantly based on retrieval method used. Common causes: 1) Using water bath for antigen retrieval instead of microwave or pressure cooker (water bath not recommended) 2) Wrong antigen unmasking buffer formulation for specific tissue or antigen target 3) Using stored 1X unmasking buffer instead of freshly prepared daily solution 4) Antigen retrieval time or temperature not optimized for particular tissue type Solutions: 1) Use microwave oven as preferred method for antigen retrieval; for difficult targets showing weak signal, test pressure cooker method for enhanced performance 2) Follow CST product-specific datasheet for recommended antigen unmasking buffer optimized for each antibody 3) Prepare fresh 1X antigen unmasking buffer solutions daily; do not use stored diluted buffers 4) Refer to CST optimized protocols on product datasheet; adjust retrieval time/temperature based on tissue type if needed