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)

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"CST IHC protocol video covers reagent handling including antibody dilution, directly contextualizing diluent-related signal/background problems."

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"IHC troubleshooting series addresses staining quality and consistency, helping interpret suboptimal signal/background from diluent selection."