Microwave-Accelerated Plasmonic Detection for Biochemical Assays
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Solution Overview
Problem
Current detection systems, particularly those using fluorescence, face limitations in reaction time and sensitivity in biochemical assays, as they are hindered by the slow kinetics of chemical reactions and reduced emissions from fluorescing molecules, necessitating methods that can accelerate biological/biochemical kinetics without damaging samples.
Innovation Solution
The introduction of low power microwaves to accelerate reaction kinetics in plasmonic detection systems by coupling plasmonic emissions from metallic surfaces with luminescing species, enhancing the intensity and speed of reactions in assays such as immunoassays and hybridization assays, using metallic nanostructures and dextran immobilized on gold nanoparticles with concanavalin A, and employing continuous planar surfaces with metallic inclusions for enhanced detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional fluorescence detection systems are used, then detection sensitivity can be achieved, but reaction time is slow due to slow biochemical kinetics
Solution Approach 1:
The patent applies microwave radiation to change the thermal and kinetic parameters of the biochemical reaction system. By introducing microwave energy, the reaction temperature and molecular motion increase, accelerating biochemical kinetics without compromising detection sensitivity. This resolves the contradiction by enabling rapid reactions while maintaining accurate fluorescence detection.
2Measurement precision
If reaction time is increased to improve detection, then sensitivity may improve, but emissions from fluorescing molecules are reduced
Solution Approach 1:
The patent employs periodic microwave irradiation combined with fluorescence detection cycles. The microwave treatment is applied in controlled intervals to accelerate reactions, followed by detection phases where fluorescence emissions are measured. This periodic approach ensures reactions proceed rapidly while fluorescence emissions are captured at optimal moments, resolving the contradiction between reaction speed and emission intensity.
3Speed
If high power microwaves are used to accelerate reactions, then reaction speed increases, but biological samples may be damaged
Solution Approach 1:
The patent uses low to moderate power microwave radiation rather than high power, applying just enough energy to accelerate biochemical kinetics significantly. This partial action approach speeds up reactions by enhancing molecular motion and collision frequency while staying below the threshold that would cause protein denaturation or other thermal damage to biological samples, thus resolving the contradiction between reaction speed and sample integrity.
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
This approach significantly increases the sensitivity and speed of biochemical assays, allowing for rapid detection and imaging by accelerating chemical reactions and enhancing fluorescence emissions, making it suitable for clinical and emergency room assessments without damaging biological samples.
Implementation Method 1
The introduction of low power microwaves to accelerate reaction kinetics in plasmonic detection systems
Implementation Method 2
Surface plasmons are electron oscillations on the surface of metals. However, these plasmons are usually non-radiative and difficult to put to practical use. Recently it has been discovered by the present inventors and colleagues that surface plasmons are easily generated and manipulated using the appropriate metal structures
Implementation Method 3
The enhanced excitation of fluorophores in close proximity to metallic surfaces including islands, and colloids can have numerous applications in the biochemical and biological applications of fluorescence because of the increased intensity of the fluorescence
Data Source
AI summary
The present invention relates to systems and methods using microwave accelerated surface plasmonics for the detection of target species. The system has a metallic surface and the system is exposed to microwave energy for increasing detection time and/or the reaction kinetics of the target species and other interacting participants in the system so that plasmonic emissions from the metallic surface alone or coupled with emissions from a luminescing entity are detected.