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Ultrasensitive Staining-Free Protein Detection After PAA Gel Electrophoresis Using Deep UV Fluorescence

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We present the observation of separated protein bands after polyacrylamide (PAA) gel electrophoresis based on the staining-free detection of their ultra violet (UV)-induced fluorescence employing deep UV confocal fluorescence microscopy. Mixtures of the three biological compounds β-Galactosidase (from Escherichia coli), apo-Transferrin (bovine) and bovine serum albumin (BSA) have been separated and a staining free detection limit below 80 pg (7.0x108 molecules) per band has been achieved. This corresponds to ∼270 molecules in the detection volume for confocal microscopy.

Keywords: Native fluorescence; deep-UV; gel electrophoresis; polyacrylamide; staining free

Document Type: Research Article


Publication date: 2007-07-01

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  • Protein & Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merit rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function.
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