Tween-20 Concentration Outside Optimal Range

Symptom

Signal intensity is lower than expected or background is elevated. Changing Tween-20 concentration in wash/incubation buffers significantly affects results.

1. 1 Tween-20 concentration higher than 0.1% in 1X TBS wash and incubation buffers compromises antibody binding
2. 2 Tween-20 concentration lower than 0.1% insufficient to reduce non-specific binding and background
3. 3 Use of PBS instead of TBS weakens signal intensity with some CST antibodies

1. 1 Maintain Tween-20 at exactly 0.1% in 1X TBS for all blocking, antibody incubation, and washing steps
2. 2 Use 1X TBS rather than PBS as base buffer; PBS may weaken signal with some antibodies
3. 3 Prepare fresh buffer with accurate Tween-20 measurement: 0.1% = 1 ml Tween-20 per 1 liter TBS
4. 4 Verify buffer pH and composition match CST recommendations: 1X TBS/0.1% Tween-20

Related Video (3)

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