Plasmonic Electricity Detection System for Bioassays
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Solution Overview
Problem
Fluorescence-based bioassays on planar surfaces lack sensitivity and require expensive optical instruments for detection, and biorecognition events are slow, limiting the effectiveness of protein and biomolecule identification.
Innovation Solution
A system that generates an electrical current by positioning fluorophores near metallic particles or nanostructures, inducing a mirror dipole and plasmonic current flow, which is proportional to the amount of binding fluorophores, allowing for digital detection of fluorescence, luminescence, chemiluminescence, or phosphorescence signatures without the need for expensive detectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluorescence-based bioassays are performed on planar surfaces, then the assay can be conducted with simple setup, but the sensitivity is poor and expensive optical instruments are required for detection
Solution Approach 1:
The patent replaces the optical detection system (photomultiplier tubes, CCD cameras, optical filters, monochromators) with an electrical detection system. Metallic particles are positioned near the fluorophore, and when the fluorophore is excited, it induces a mirror dipole in the metal that generates a measurable electrical current. This substitution of optical detection with electrical detection eliminates the need for complex and expensive optical instruments while improving sensitivity through the plasmonic enhancement effect.
Solution Approach 2:
The patent changes the detection parameter from optical signal measurement to electrical current measurement. By positioning metallic particles in close proximity to the fluorophore, the system converts the fluorescence signal into an electrical signal through induced dipole moments and plasmonic current flow. This parameter change enables detection with simple electrical instruments rather than complex optical equipment.
2Ease of manufacture
If traditional fluorescence detectors are used, then detection can be performed, but the cost of equipment is high and additional equipment is required
Solution Approach 1:
The patent replaces expensive optical detection equipment with simple electrical measurement devices. The metallic particles convert the fluorescence signal into an electrical current that can be measured with basic voltmeters or current meters. This substitution dramatically reduces equipment cost while maintaining or improving detection capability through the plasmonic signal enhancement mechanism.
3Productivity
If biorecognition events are performed on planar surfaces, then the assay setup is simple, but the reaction speed is slow (several minutes to hours)
Solution Approach 1:
The patent introduces metallic particles at specific locations near the fluorophore to create localized plasmonic fields. These localized electromagnetic fields enhance the fluorescence signal and accelerate the biorecognition process by improving the efficiency of energy transfer and molecular interactions. This local enhancement approach increases assay speed without requiring complete system redesign.
4Measurement precision
If planar surface assays are used, then the system is simple to operate, but the sensitivity and detection limit are poor
Solution Approach 1:
The patent replaces complex optical detection with simple electrical measurement. The metallic particles generate electrical currents in response to fluorophore excitation, which can be measured with basic electrical instruments. This substitution maintains operational simplicity while dramatically improving detection sensitivity through plasmonic enhancement.
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 enhances sensitivity and speed of bioassay detection, providing a direct and digital readout of biomolecule concentrations, suitable for various assays including immunoassays and chemiluminescence-based reactions, and potentially powers handheld devices.
Implementation Method 1
The improved sensitivity is made possible by the increase in fluorescence signatures and decreased lifetimes of fluorophores placed in close proximity to PSPs, described by a phenomenon called Metal-Enhanced Fluorescence (MEF).
Implementation Method 2
incorporating plasmon resonant particles (PSPs) into these assays... fluorophores are positioned within a distance where their emission is increased due to their interactions with the surface plasmons of PSPs.
Implementation Method 3
excitation of the fluorophore by electromagnetic energy induces a mirror dipole in the metallic material causing plasmonic current flow
Data Source
AI summary
The present invention relates to detection systems and methods that detect fluorescence, luminescence, chemiluminescence or phosphorescence signatures in the form of an electrical signal conducted and emitted from metallic containing surfaces. Thus, the present invention provides for detecting fluorescence digitally and directly without the need for expensive detectors.