Uneven Bands Due to Improper Gel Polymerization

Symptom

Bands appear distorted, wonky, or uneven across lanes. In extreme cases, the same protein appears at different molecular weights in different lanes due to irregular gel matrix formation.

1. 1 Incorrect TEMED concentration in gel recipe causing incomplete or uneven polymerization
2. 2 Gel not fully covered with buffer during setting process
3. 3 Uneven polymerization across gel thickness or width
4. 4 Temperature fluctuations during gel polymerization phase

1. 1 Verify gel recipe and confirm correct TEMED volume is added
2. 2 Ensure gel is completely covered with buffer during polymerization
3. 3 Allow adequate polymerization time (minimum 30-45 minutes for resolving gel)
4. 4 Prepare fresh acrylamide solutions and check ammonium persulfate (APS) activity

Related Video (3)

Bio-Rad Laboratories ★ 85

Setting Up and Running Mini-PROTEAN® TGX™ Precast Gels

"Directly demonstrates SDS-PAGE gel setup and running procedures with precast gels, essential for understanding proper polymerization and gel matrix formation in Western blotting."

Bilibili (China-Accessible Mirrors) ★ 82

Western blot full protocol: Protein extraction to chemiluminescence

"Complete hands-on Western blot workflow including electrophoresis phase where gel polymerization quality directly impacts band evenness and reproducibility."

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Western blot hands-on: Protein extraction through detection

"Emphasizes troubleshooting common pitfalls in Western blotting with detailed protocol steps, likely addressing gel preparation issues that cause uneven bands."