What are the possible causes for nonspecific or diffuse bands for my western blot experiment?

Question

Accepted Answer

Possible cause

Solution

Excessive amounts of protein loaded on gel

Load less sample on the gel

High antibody concentration

Use a lower concentration of antibodies, particularly for primary antibodies

Chemiluminescent substrate emits a very strong signal

Use a less concentrated substrate
Reduce duration of membrane incubation with substrate
Expose blot to film for a shorter duration
Use a lower antibody concentration, particularly AP- and HRP- conjugated antibodies
Remove substrate completely after incubation is complete

Possible cause	Solution
Excessive amounts of protein loaded on gel	Load less sample on the gel
High antibody concentration	Use a lower concentration of antibodies, particularly for primary antibodies
Chemiluminescent substrate emits a very strong signal	Use a less concentrated substrate Reduce duration of membrane incubation with substrate Expose blot to film for a shorter duration Use a lower antibody concentration, particularly AP- and HRP- conjugated antibodies Remove substrate completely after incubation is complete

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