Western Blot Protocol Beginner Tutorial with Operations

severe

Low or No Signal on Western Blot

Target protein bands are absent or very faint on the blot, even after extended exposure times. Positive control samples may also show weak or no signal.

💡 6 · ✓ 6

severe

Poor Protein Transfer

Proteins do not transfer efficiently from gel to membrane, resulting in weak or no signal

💡 4 · ✓ 4

moderate

White bands / inverted signal (over-detection)

White (hollow) bands appear against a black background, or strong positive positions appear white instead of black — signal is so saturated that it appears inverted.

💡 3 · ✓ 4

moderate

Weak Signal from Inadequate Antibody Concentration

Western blot shows weak or barely detectable bands even with adequate exposure time. Positive controls may show reduced signal intensity compared to expected results, indicating suboptimal antibody binding.

💡 4 · ✓ 4