Uneven or Irregular Blot Appearance (Western Blot Immunodetection)

Question

Accepted Answer

Membrane shows fingerprints, fold marks, or forceps imprints creating irregular patterns. Uneven signal distribution not related to protein bands. Common causes: 1) Touching membrane with bare hands transfers oils and proteins 2) Folding or creasing membrane during handling 3) Forceps with sharp tips damage or mark membrane 4) Membrane drying unevenly during incubation Solutions: 1) Always wear powder-free gloves when handling membranes 2) Use blunt-end stainless steel forceps for membrane manipulation 3) Handle membrane gently; avoid folding or creasing at any step 4) Use sufficient reagent volumes to completely cover membrane during all incubations; ensure membrane remains wet