Hydroxyquinolone Dyes for Sub-Nanogram Protein Detection
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Solution Overview
Problem
Current protein detection methods using visible organic dyes have limitations in sensitivity, often requiring detection limits in the range of 1 ng to 10 ng, and lack the multiplexing capabilities and accuracy provided by fluorescent methods.
Innovation Solution
The use of substituted hydroxyquinolone compounds as fluorescent dyes, which bind to proteins with increased sensitivity, ease of use, and reduced background noise, allowing for detection and quantitation at sub-nanogram levels by increasing fluorescence when bound to proteins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visible organic dyes such as Coomassie G250 or Coomassie R250 are used for protein detection, then the method is simple and easy to use, but the detection sensitivity is limited to 1 ng to 10 ng
Solution Approach 1:
The patent changes the detection parameter from visible light absorption to fluorescence emission, enabling detection at sub-nanogram levels. The hydroxyquinolone dyes exhibit enhanced fluorescence when bound to proteins, allowing detection sensitivities below 1 ng while maintaining procedural simplicity similar to traditional staining methods.
Solution Approach 2:
The patent replaces the mechanical/optical system of visible light absorption with a fluorescence-based detection system. This substitution enables higher sensitivity detection without significantly increasing operational complexity, as the staining procedure remains straightforward while the detection capability is enhanced through fluorescence measurement.
2Measurement precision
If fluorescent methods are used for protein detection, then detection sensitivity and multiplexing capabilities are improved, but the background signal increases
Solution Approach 1:
The patent applies local quality by designing dyes with specific chemical structures (hydroxyquinolone core with various substituents) that selectively bind to proteins and exhibit fluorescence only in the protein-bound state. This localized fluorescence activation at the protein-dye interface enhances signal-to-background ratio, achieving sub-nanogram detection sensitivity while maintaining low background signals.
Solution Approach 2:
The patent utilizes fluorescence emission as the detection mechanism, where the hydroxyquinolone dyes exhibit enhanced fluorescence when bound to proteins. This optical property change enables highly sensitive detection with low background signals, as the fluorescence is specifically activated upon protein binding rather than presenting constant background noise.
3Measurement precision
If traditional chromogenic dyes are used, then the detection limit is 1 ng to 10 ng, but the accuracy and multiplexing capabilities are insufficient
Solution Approach 1:
The patent changes the detection parameter from visible light absorption to fluorescence emission, enabling detection at sub-nanogram levels. The hydroxyquinolone dyes exhibit enhanced fluorescence when bound to proteins, allowing detection sensitivities below 1 ng while maintaining procedural simplicity similar to traditional staining methods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The hydroxyquinolone dyes achieve detection sensitivities of less than 1 ng, providing more accurate and sensitive protein detection and quantitation, with enhanced multiplexing capabilities and compatibility with various protein types and gel formats, while maintaining low background signals.
Implementation Method 1
fluorescent dyes and their methods of use in protein detection and quantitation... The fluorescence of hydroxyquinolone dyes increases when the dye is bound to protein
Data Source
AI summary
A hydroxyquinolone compound formulated as a fluorescent dye for protein detection, assay, quantitation, etc. The hydroxyquinolone compound may be modified, for example, by adding or removing sulfate groups, changing hydrocarbon chain lengths, etc. to result in more desirable properties such as enhanced binding to basic proteins, enhanced solubility, etc. The dye has enhanced sensitivity over commercially available protein stains, and may be used to stain proteins in solution, proteins separated on gels, proteins transferred to solid supports, etc. Methods of using the dyes are also disclosed.