Fluorescent Nanoparticle Labels That Resist Quenching in Lateral Flow Assays
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Solution Overview
Problem
Current fluorescent labels used in lateral flow assays suffer from low sensitivity, narrow detection range, and fluorescence quenching effects, limiting their effectiveness in quantitative analysis and point-of-care diagnostics.
Innovation Solution
Development of fluorescent nanoparticles with high solid-state quantum yield, tunable emission wavelengths, and wide detection range, fabricated via polymerization or microfluidic methods, and functionalized with biorecognition molecules for enhanced sensitivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional fluorescent labels are used in lateral flow assays, then the assay can be performed with simple equipment, but the detection sensitivity is low and the detection range is narrow
Solution Approach 1:
The patent changes the physical and chemical parameters of the fluorescent labels by using nanoparticles with controlled size (20-200 nm), composition (carbon dots, silicon dots, polymer dots), and surface properties. These parameter changes result in enhanced quantum yield, improved photostability, and expanded detection ranges while maintaining compatibility with simple lateral flow assay systems
Solution Approach 2:
The patent employs composite fluorescent nanoparticle structures including core-shell configurations, doped semiconductor particles, and hybrid organic-inorganic materials. These composite structures combine the advantages of different materials to achieve high sensitivity, broad detection ranges, and resistance to quenching effects while remaining suitable for point-of-care diagnostic devices
2Measurement precision
If fluorescent labels are used at high concentration to improve signal intensity, then detection sensitivity increases, but fluorescence quenching effect occurs
Solution Approach 1:
The patent converts the potential harm of aggregation into a benefit by designing aggregation-induced emission (AIE) fluorescent nanoparticles. These particles exhibit enhanced fluorescence upon aggregation, allowing high concentration use without quenching. The aggregation that would normally cause quenching in conventional fluorophores instead enhances the signal in AIE nanoparticles, enabling high sensitivity detection without the harmful quenching effect
Solution Approach 2:
The patent changes the photophysical parameters of the fluorescent labels by using materials with different emission mechanisms. Carbon dots, silicon dots, and AIE nanoparticles exhibit concentration-resistant fluorescence due to their unique electronic structures and emission mechanisms, allowing signal intensity to increase linearly with concentration without the diminishing returns caused by quenching in conventional dyes
3Measurement precision
If quantum dots are used to achieve high quantum yield and tunable emission, then detection sensitivity improves, but toxicity increases and synthesis becomes complicated
Solution Approach 1:
The patent replaces toxic, expensive, and complex CdSe quantum dots with biocompatible, environmentally friendly alternatives such as carbon dots, silicon dots, and polymer-based fluorescent nanoparticles. These materials are non-toxic, can be synthesized through simple and scalable methods, and provide comparable or superior optical properties. The use of abundant, non-toxic elements (carbon, silicon) replaces rare and toxic metals (cadmium, selenium), eliminating the harmful effects while maintaining high quantum yields and tunable emission wavelengths
Solution Approach 2:
The patent changes the material composition parameters from toxic heavy metals to biocompatible elements. Carbon dots and silicon dots exhibit high quantum yields (50-90%) and tunable emission across UV-visible-NIR ranges, matching or exceeding conventional quantum dots while being non-toxic. The bandgap engineering of these materials allows precise control of emission wavelengths without requiring toxic dopants or complex core-shell structures
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 nanoparticles provide improved detection sensitivity and stability, enabling quantitative analysis with a broader detection range and resistance to fluorescence quenching, suitable for point-of-care diagnostics and multiplexed assays.
Implementation Method 1
fluorescent nanoparticles with high solid-state quantum yield, tunable emission wavelengths
Implementation Method 2
fabricated via polymerization or microfluidic methods
Data Source
AI summary
Provided are fluorescent nanoparticles and their conjugates and methods of using the same for in vivo and in vitro diagnostics and other applications. In some embodiments, provided are fluorescent nanoparticles with high solid-state absolute quantum yield. In some embodiments, provided are methods of manufacturing such nanoparticles. Nanoparticles may comprise monomers, such as styrene, and fluorophores, such as AIEgen™ Bright Green.