Spiky Metallic Nanostructures for LSPR Assay Sensitivity
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Solution Overview
Problem
Current immunoassays and biomolecule binding assays are complex, require multiple steps, and lack sensitivity due to the need to separate labeled from unlabeled specific binding partners, and existing assays based on localized surface plasmon resonance (LSPR) properties of noble metal nanoparticles suffer from low sensitivity and cannot quantitatively monitor sequential binding events.
Innovation Solution
The use of nanostructure-binding partner conjugates, specifically metallic nanostructures with a plurality of spikes, coupled with binding partners capable of specific binding to target analytes, to enhance sensitivity and minimize non-specific binding in LSPR-based assays. These conjugates are mixed with a sample, exposed to a light source, and the optical signal is measured to indicate the presence of the target analyte.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional immunoassays use labeled binding partners, then specific binding can be detected, but the assays become complex and require multiple steps to separate labeled from unlabeled partners
Solution Approach 1:
The patent extracts the labeling function from separate entities and integrates it directly into the binding partner itself. The binding partner is conjugated to metallic nanostructures that provide the LSPR signal, eliminating the need for separate labeled and unlabeled separation steps. This integration simplifies the assay while maintaining detection sensitivity.
Solution Approach 2:
The patent merges the binding function and detection function into a single integrated system. The binding partner is conjugated to metallic nanostructures, combining the specific binding capability with the LSPR detection signal in one component, thereby eliminating the need for separate labeling and separation steps.
2Measurement precision
If conventional LSPR assays use noble metal nanoparticles, then binding events can be detected, but sensitivity remains low and sequential binding kinetics cannot be monitored
Solution Approach 1:
The patent changes the physical parameters of the metallic nanostructures, specifically using spiky or branched geometries instead of conventional spherical nanoparticles. This geometric modification enhances the LSPR signal amplitude and sensitivity, enabling detection of sequential binding events and improving assay throughput.
Solution Approach 2:
The patent employs composite metallic nanostructures with spiky or branched geometries that combine enhanced LSPR properties with binding partner conjugation. These composite structures provide both high sensitivity detection and the capability to monitor sequential binding kinetics by analyzing temporal changes in the LSPR signal.
3Measurement precision
If metallic nanoparticles are used in diagnostic assays, then binding events can be detected, but non-specific binding increases and sensitivity decreases
Solution Approach 1:
The patent applies local quality modification by conjugating binding partners specifically to the surface of metallic nanostructures, creating localized binding sites. This localized conjugation approach, combined with optimization of nanostructure geometry and surface properties, reduces non-specific binding while maintaining high detection sensitivity for specific targets.
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 method achieves significant amplification in LSPR-based assays, allowing for sensitive detection of target analytes at nanogram, picogram, or femtogram quantities while minimizing non-specific binding, thus overcoming the limitations of current assays.
Implementation Method 1
LSPR is the collective oscillation of electrons in nanometer-sized structures induced by incident light. Metallic nanoparticles have a strong electromagnetic response to refractive index changes in their immediate vicinity and thus shifts in the resonance frequency of the nanoparticles can be measured as an indicator of molecules binding to the nanoparticle surface.
Implementation Method 2
exposing the complex to a light source at a wavelength range within the ultraviolet-visible-infrared spectrum. In some embodiments, the methods comprise measuring an optical signal from the complex
Data Source
AI summary
The present invention relates to nanostructure-binding partner conjugates, as well as reaction mixtures, analyte detection devices, and methods of making and using the conjugates. In particular, the invention provides a method of detecting a target analyte in a sample comprising mixing the sample with a first detection conjugate and a second detection conjugate in solution, wherein the first and second detection conjugates comprise metallic nanostructures coupled to binding partners that are capable of specifically binding to the target analyte if present in the sample to form a complex between the first detection conjugate, the analyte, and the second detection conjugate, wherein a change in an optical signal upon complex formation indicates the presence of the target analyte in the sample.