Smile Effect on Western Blot Bands

Symptom

Bands appear curved in a smile-shaped pattern across the gel, with edges migrating faster than the center. This distortion affects all lanes uniformly and compromises molecular weight estimation.

1. 1 Voltage too high during electrophoresis causing excessively rapid migration
2. 2 Gel temperature too high during migration altering buffer pH
3. 3 Insufficient cooling during electrophoresis run
4. 4 Heat accumulation in center of gel due to lack of temperature control

1. 1 Decrease voltage according to protocol recommendations and gel specifications
2. 2 Run electrophoresis at 4°C on ice or in cold room
3. 3 Pre-chill running buffer before use
4. 4 For large proteins (>100 kDa), run overnight at constant low amperage and reduced voltage

Related Video (3)

Bio-Rad Laboratories ★ 85

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"Demonstrates proper setup and execution of SDS-PAGE gel electrophoresis with emphasis on correct running procedures, directly addressing voltage control during electrophoresis."

Cell Signaling Technology ★ 82

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"Comprehensive Western blot protocol video covering all steps including electrophoresis conditions needed to obtain reproducible, artifact-free results without band distortion."

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"Complete hands-on Western blot workflow with focus on troubleshooting common pitfalls, likely addressing electrophoresis parameter optimization to prevent band artifacts."