WB protein bands appear darker on both sides and lighter in the middle; what is the reason?

In Western Blot (WB) analysis, if the protein band appears darker at the edges and lighter in the center, the most likely reason isSample overloadWhen the amount of protein loaded into the gel exceeds its separation capacity, the protein may not migrate uniformly during electrophoresis, especially in the center of the gel. This can cause the protein to migrate faster or further at the edges, resulting in the middle part of the band appearing relatively lighter.

To solve this problem, try reducing the amount of protein loaded onto the gel, ensuring that the protein concentration and volume are appropriate to achieve more uniform bands. It is also recommended to check the electrophoresis and membrane transfer steps to ensure there are no other factors causing uneven protein migration.

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