Gold Nanoparticle LSPR Biosensor for Low-Concentration Biomarker Detection
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Solution Overview
Problem
Current diagnostic tools for infectious and non-infectious diseases are inefficient, costly, and require sophisticated laboratories and expert personnel, lacking accuracy, compatibility with different biological fluids, temperature stability, and portability, and are not suitable for early detection of biomarkers at low concentrations.
Innovation Solution
A composition using gold nanoparticles linked to polyclonal antibodies that undergo a visible color change from red to blue upon self-assembly when binding to biomarkers, allowing for rapid, sensitive, and specific detection of ultra-low concentrations of biomarkers without natural aggregation, suitable for point-of-care testing and integration with wearable devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laboratory-based diagnostic techniques are used, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical/optical laboratory instrumentation with a biochemical sensing system based on surface plasmon resonance. The detection mechanism uses label-free binding events between analytes and receptors on sensor surfaces, eliminating the need for complex mechanical sample preparation, optical alignment, and data processing systems required by traditional laboratory techniques.
Solution Approach 2:
The sensor platform is designed with universal applicability across multiple disease types and analyte classes. The same core sensor technology can detect infectious disease pathogens, cancer biomarkers, cardiovascular markers, and neurological disease proteins by simply changing the receptor layer, eliminating the need for disease-specific instrumentation and reducing overall system complexity.
2Speed
If rapid detection is implemented, then speed is improved, but measurement precision deteriorates
Solution Approach 1:
The system performs preliminary concentration enrichment of the analyte in the sample before the actual detection event. The sensor surface is pre-functionalized with high-density receptor arrays that capture and concentrate target molecules from the sample, ensuring sufficient signal strength for accurate detection even in rapid, single-step measurements without compromising precision.
Solution Approach 2:
The patent employs dynamic control of measurement parameters including injection rates, contact times, and regeneration conditions to optimize both speed and precision. By adjusting these parameters based on analyte concentration and binding kinetics, the system achieves accurate quantification in minutes rather than hours, resolving the speed-precision trade-off.
3Volume of moving object
If sensor size is reduced, then portability is improved, but measurement precision deteriorates
Solution Approach 1:
The patent concentrates sensing functionality in highly localized regions on the sensor surface with optimized receptor densities and geometries. By creating zones of enhanced analytical performance in specific local areas rather than uniformly across the entire sensor, the system maintains high sensitivity in compact form factors, enabling portable applications without sacrificing measurement precision.
Solution Approach 2:
The sensor employs composite structures combining multiple functional layers including biorecognition elements, transduction layers, and signal amplification components in a miniaturized configuration. This composite approach allows the small sensor to achieve laboratory-equivalent sensitivity by integrating multiple functions that would otherwise require separate, larger instruments.
4Measurement precision
If detection sensitivity is increased for low concentrations, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The sensor system performs self-regeneration and self-reconfiguration to maintain sensitivity for low-concentration detection. The surface chemistry is designed to allow automatic regeneration of binding sites through simple rinsing or chemical treatment, and the receptor layers can be reconfigured to target different analytes, eliminating the need for complex manual preparation and calibration procedures that would increase device complexity.
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
Enables rapid, sensitive, and specific detection of biomarkers at ultra-low concentrations, suitable for point-of-care testing and integration with wearable devices, with a straightforward scale-up process and reduced instrumentation size.
Implementation Method 1
Localized Surface Plasmon Resonance Detector... Plasmons occur on the surface of gold nanoparticles. A plasmon is a coherent delocalized electron oscillation. Plasmon bands are the energy levels which are associated with a plasmon. The transition from dispersed gold nanoparticles to self-assembled gold nanoparticles causes shifts in the energies of the plasmon bands.
Data Source
AI summary
A composition comprising gold nanoparticles which are linked to polyclonal antibodies. The composition may be used to detect the presence of a target which binds to the polyclonal antibody in solution. The binding of the target to the polyclonal antibody triggers a self-assembly of the polyclonal antibody and the gold nanoparticles. This self-assembly of the polyclonal antibody and the gold nanoparticles triggers a colour change in the surface plasmon of the gold nanoparticles which indicates the presence of the target.