Western Blot practical handbook
Western Blot protocol, troubleshooting and quantification guide
Find working conditions and common problems by experimental step, from sample preparation and SDS-PAGE through transfer, antibodies, detection and quantification.
Western Blot workflow
Choose the step you are working on. Each guide lists starting conditions, checks to make, and signs that the method needs adjustment.
01
Sample preparation
Choose extraction from the target compartment, verify protein-assay compatibility and determine a usable sample input.
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02
SDS-PAGE
Choose the gel system and separation range, then check lane shape and target-region resolution before transfer.
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03
Transfer
Choose the transfer method and membrane, then confirm that the target-size region left the gel and remained on the membrane.
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04
Blocking & antibodies
Use the exact antibody instructions to choose blocker and diluent, then adjust primary and secondary conditions separately.
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05
Detection & quantification
Confirm that target and normalization signals are unsaturated and within a usable response range before calculating changes.
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Something went wrong?
If a blot looks wrong, use the whole membrane, controls and transfer stain to decide what to check first.
Common result patterns
Open the full troubleshooting guide →The whole blot is blank
Check acquisition and detection, transfer, the positive control and the antibody pair.
Target is absent but control is present
Check expression, expected size, sample fraction and target-size transfer before titrating the antibody.
Uniform dark background
Check exposure and secondary antibody first, then washing and blocker/diluent compatibility.
Extra bands or a smear
Check overload and degradation as well as true isoforms, processing and antibody cross-reactivity.
Uneven or patchy signal
Use the position of the artifact to check bubbles, contact, incubation coverage, contamination and the imaging surface.
Laboratory tools and reference material
Planning guides, calculators, worksheets, diagnostic cases and source references are collected here.
Experimental planning
Confirm target biology, controls, extraction, membrane choice and the measurement plan before loading.
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Buffer recipes
Open common Western Blot buffer formulations with notes on where they may need adjustment.
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Laboratory calculators
Calculate sample mixtures, antibody dilutions, TBST and other routine experimental volumes.
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Experiment worksheets
Record actual conditions, raw-file locations and the next planned change in printable worksheets.
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Diagnostic cases
Review common failure patterns, likely causes and experiments that help distinguish them.
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References
Open the manufacturer protocols, methods papers and reporting guidance cited across the site.
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About this handbook
The conditions on this site are starting points. Product instructions for the antibody, gel, membrane and equipment in use take priority, and important conditions should be checked in the actual experimental system.