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Fluoroprofile, a fluorescence-based assay for rapid and sensitive quantitation of proteins in solution
Authors:Mackintosh James A  Veal Duncan A  Karuso Peter
Affiliation:FLUOROtechnics Pty Ltd., Sydney, NSW, Australia.
Abstract:
The development of a sensitive fluorescence-based assay for the quantitative determination of protein concentration is described. The assay is based on the natural product epicocconone, which produces a large increase in fluorescence quantum yield upon binding to detergent-coated proteins in solution. There is a concomitant shift in the emission maximum from 520 to 605 nm after binding, which results in low background signal allowing a linear dynamic range of 40 ng/mL to 200 microg/mL for most proteins. There is little protein-to-protein variation except for iron-containing proteins and the assay can be used so that it is tolerant of chemicals commonly used in 2-D sample buffers. The assay is more sensitive than standard absorption assays such as the Bradford and Lowry assays, and has a greater dynamic range and sensitivity than other fluorescent assays.
Keywords:2‐DE  Epicocconone  Fluorescence  Protein quantitation
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