Incorrect Antibody Diluent Selection

Symptom

Staining quality is significantly reduced or inconsistent when using generic diluent instead of product-specific recommended diluent, as different antibodies perform optimally in different buffer compositions.

1. 1 Using TBST/5% NGS for antibody that requires SignalStain® Antibody Diluent (e.g., Phospho-Akt Ser473 #4060)
2. 2 Using SignalStain® Antibody Diluent for antibody that performs better in TBST/5% NGS (e.g., Phospho-EGFR Tyr1173 #4407)
3. 3 Assuming all antibodies work with same diluent formulation without checking product datasheet

1. 1 Always check product datasheet for recommended primary antibody diluent specific to each antibody
2. 2 Use SignalStain® Antibody Diluent when specified on datasheet (superior for certain phospho-antibodies)
3. 3 Use TBST/5% NGS when specified on datasheet (better for certain receptor antibodies)
4. 4 If using non-recommended diluent, perform full antibody titration to re-optimize dilution

Related Video (3)

Cell Signaling Technology ★ 85

Immunohistochemistry Protocol for Paraffin embedded Tissue Sections

"CST's own IHC protocol video directly matches the CST guide failure case and shows reagent handling including antibody diluent steps."

Bilibili (China-Accessible Mirrors) ★ 80

Immunohistochemistry on Paraffin-Embedded Sections (CST Demo)

"CST IHC demo on paraffin sections mirrors the source protocol and shows the staining workflow where diluent choice matters."

Cell Signaling Technology ★ 70

Better IHC Step 1: Antigen Retrieval

"CST troubleshooting video on improving IHC staining consistency addresses the kind of reduced/inconsistent staining caused by diluent mismatch."