Incorrect Antibody Diluent Selection

Symptom

Suboptimal signal intensity or background issues despite correct antibody concentration. Different antibodies show dramatically different performance in TBST/5% NGS versus SignalStain Antibody Diluent.

1. 1 Using TBST/5% Normal Goat Serum when SignalStain Antibody Diluent is recommended for specific antibody
2. 2 Using SignalStain Antibody Diluent when TBST/5% NGS is optimal for specific antibody
3. 3 Antibody concentration not re-titrated after switching to non-recommended diluent

1. 1 Always use recommended primary antibody diluent as specified on product datasheet (e.g., Phospho-Akt #4060 requires SignalStain Diluent; Phospho-EGFR #4407 requires TBST/5% NGS)
2. 2 If using alternative diluent, perform complete antibody titration to optimize concentration
3. 3 Check product datasheet and product page for specific diluent recommendations before starting experiment

Related Video (3)

Bilibili (China-Accessible Mirrors) ★ 85

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"CST's own paraffin-section IHC demo directly demonstrates the antibody diluent and reagent selection steps where this failure occurs."

Cell Signaling Technology ★ 78

Immunohistochemistry Protocol for Paraffin embedded Tissue Sections

"CST IHC protocol video covers reagent preparation including antibody dilution, matching the failed step from the same source as the guide."

Cell Signaling Technology ★ 60

Better IHC Step 1: Antigen Retrieval

"CST troubleshooting-focused IHC video on protocol optimization frames the buffer/reagent selection context that underlies this failure."