Endogenous Biotin Interference

Symptom

High background staining specifically in kidney, liver, or other biotin-rich tissues when using biotin-based detection. Background not resolved by standard blocking procedures.

1. 1 Biotin-based detection system used on tissues with high endogenous biotin levels (kidney, liver)
2. 2 Endogenous biotin binds avidin/streptavidin detection reagents creating false-positive signal
3. 3 No biotin blocking step performed prior to primary antibody incubation

1. 1 Switch to polymer-based detection system (SignalStain Boost IHC Detection Reagents #8114 or #8125) which eliminates biotin interference
2. 2 If biotin-based detection must be used, perform biotin block after normal blocking procedure and prior to primary antibody incubation
3. 3 Avoid biotin-based systems entirely for kidney and liver tissue IHC experiments

Related Video (2)

Bilibili (China-Accessible Mirrors) ★ 82

Immunohistochemistry on Paraffin-Embedded Sections (CST Demo)

"CST IHC demo on paraffin sections covers the exact protocol context where endogenous biotin interference arises."

Cell Signaling Technology ★ 75

Immunohistochemistry Protocol for Paraffin embedded Tissue Sections

"CST IHC protocol video shows the detection workflow where biotin-based systems and blocking steps are used."