Western Blot Protocol Beginner Tutorial with Operations

severe

Multiple / non-specific bands

Bands appear at molecular weights that do not match the expected target; multiple bands present where only one is expected.

💡 5 · ✓ 5

severe

HRP Activity Inhibition by Sodium Azide

Western blot shows no signal or extremely weak signal when using HRP-conjugated secondary antibodies. Chemiluminescent substrate fails to produce expected light emission even with adequate antibody binding and exposure time.

💡 4 · ✓ 5

severe

Incorrect Antibody Selection

No signal or unexpected banding pattern despite proper protocol execution

💡 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

moderate

Inadequate Antibody Incubation Time

Western blot yields weak signal despite using appropriate antibody concentrations and sample amounts. The antibody-antigen binding has not reached equilibrium, resulting in suboptimal signal development.

💡 4 · ✓ 4

moderate

Black Dots or Speckled Background on Western Blot

Non-specific dark dots or speckled pattern appear across the membrane background, not localized to protein bands. The signal appears as discrete spots rather than uniform background.

💡 5 · ✓ 5