A fluorescent Ponceau S-based total protein normalization method for conventional and challenging immunoblot samples

Area of Science:

• Biochemistry
• Molecular Biology
• Proteomics

Background:

• Immunoblotting normalization is crucial for accurate protein quantification.
• Traditional methods face limitations, but whole lane staining offers improvements.
• Ponceau S stain possesses fluorescent properties that can be leveraged.

Purpose of the Study:

• To develop and validate a novel, cost-effective method for immunoblotting normalization.
• To combine whole lane staining with fluorescence detection using Ponceau S.
• To assess the performance of this new method compared to existing techniques.

Main Methods:

• Utilizing Ponceau S stain's fluorescence by excitation at 488 nm.
• Applying the 'fluorescent Ponceau' method to protein lysates from various sources (cells, human, mouse tissues).
• Evaluating linearity, sensitivity, and repeatability of the fluorescent Ponceau method.

Main Results:

• The fluorescent Ponceau method demonstrated superior linearity, sensitivity, and repeatability.
• The method proved effective across diverse protein lysates with different biochemical profiles.
• This technique offers a cost-free solution for post-blot normalization.

Conclusions:

• Fluorescent Ponceau staining is a robust and accessible method for immunoblotting normalization.
• This approach overcomes limitations of previous normalization strategies.
• The method provides reliable quantification for various analytes in biological samples.