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Analytical Chem JoVE (Open Access) Citable · DOI

A Guide to Modern Quantitative Fluorescent Western Blotting with Troubleshooting Strategies

DOI: 10.3791/52099-v
What you'll learn
  • ✓ Perform quantitative fluorescent western blotting with proper sample preparation and protein transfer
  • ✓ Troubleshoot common technical problems in fluorescence detection and membrane handling
  • ✓ Analyze and quantify protein expression data from scanned blot images
Protocol

The advancement of western blotting using fluorescence has allowed detection of subtle changes in protein expression enabling quantitative analyses. Here we describe a robust methodology for detection of a range of proteins across a variety of species and tissue types. A strategy to overcome common technical problems is also provided.

Difficulty
intermediate
Total time
~4–6 hours per sample batch (including transfer, visualization, and image scanning)
Biosafety
BSL-1

Steps

1
Prepare and load protein samples

Prepare tissue or cell lysates and load samples onto polyacrylamide gels for electrophoretic separation. Ensure proper sample concentration and volume standardization for quantitative analysis.

▶ 01:32
2
Transfer proteins using iBlot2 system

Use iBlot2 semi-dry fast transfer apparatus to transfer separated proteins from gel to membrane. This automated system enables reproducible, rapid protein transfer across tissue types and species.

▶ 03:43
3
Handle and prepare membrane post-transfer

Block non-specific antibody binding sites and apply primary and secondary antibodies with appropriate wash steps. Proper membrane handling prevents background noise and improves signal specificity.

▶ 04:54
4
Visualize and scan fluorescent signal

Image the membrane using fluorescence imaging equipment to detect antibody-labeled proteins. Optimize imaging parameters to capture quantifiable signal across the dynamic range.

▶ 06:32
5
Quantify protein expression from scanned images

Use densitometry software to measure pixel intensity and calculate relative protein expression levels. Apply normalization strategies using loading controls for accurate quantitative comparison.

▶ 07:51
6
Interpret representative quantitative western results

Review example blots and quantification data demonstrating detection of subtle protein expression changes across multiple experimental conditions and tissue types.

▶ 08:50
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