Nanoparticle-Enhanced Evanescent Wave Analyte Detection
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Solution Overview
Problem
Current detection methods for analytes, particularly in clinical diagnostics and environmental monitoring, face challenges in achieving high sensitivity, accuracy, and rapid on-site detection due to limitations in sensitivity to non-specific adsorption and the need for complex, costly equipment.
Innovation Solution
A method involving a sandwich-like structure formed by reacting a test solution with nanoparticles and an optical waveguide element, using a photodetector to measure evanescent wave energy absorbed or scattered by nanoparticles, with anti-nonspecific adsorption layers to reduce interference and simplify the detection process, allowing for high sensitivity and rapid analysis without the need for complex equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection methods are used, then detection can be performed, but detection sensitivity is insufficient and detection limit is high
Solution Approach 1:
The patent introduces nanoparticles as intermediary elements that bind to the analyte and transfer the binding event to the optical waveguide surface. The nanoparticles act as mediators between the analyte and the detection system, amplifying the signal through their optical properties (plasmon resonance) and enabling detection at much lower concentrations than conventional methods
Solution Approach 2:
The patent utilizes changes in optical parameters (absorbance, scattering, plasmon resonance frequency) of nanoparticles when they bind to the analyte. By monitoring these optical parameter changes, the system achieves high sensitivity detection. The optical properties of the nanoparticles serve as the detection signal, allowing quantification of analyte concentration
2Measurement precision
If particle plasmon resonance sensing is used, then detection sensitivity is improved, but accuracy is greatly affected by non-specific adsorption
Solution Approach 1:
The patent applies preliminary anti-action by coating the optical waveguide surface with anti-nonspecific adsorption layers before introducing the nanoparticle-analyte complex. This preliminary coating prevents non-specific adsorption of proteins and other interfering substances onto the waveguide surface, thereby maintaining measurement accuracy while preserving the sensitivity enhancement from plasmon resonance
Solution Approach 2:
The anti-nonspecific adsorption layers serve as protective intermediaries between the waveguide surface and the sample environment. These layers specifically prevent unwanted adsorption events while allowing the intended nanoparticle-analyte interactions to proceed, thus isolating the detection signal from interfering background signals
3Loss of time
If rapid on-site detection is implemented, then detection time is reduced, but detection sensitivity may be compromised
Solution Approach 1:
The patent merges multiple functions into a single integrated platform: the optical waveguide serves as both the optical path and the sensing surface, the nanoparticles provide both the recognition elements and the optical signal, and the anti-nonspecific adsorption layers provide both protection and a controlled surface for binding. This integration enables rapid detection while maintaining sensitivity by eliminating the need for separate functional components
Solution Approach 2:
The system employs self-service mechanisms where the nanoparticles automatically bind to the analyte and the optical signal is generated through their inherent plasmon resonance properties. The anti-nonspecific adsorption layers self-assemble on the waveguide surface to provide protection. These self-organizing behaviors eliminate the need for complex manual operations and reduce detection time while maintaining high sensitivity
4Measurement precision
If complex detection equipment is used, then detection precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical and electronic detection systems with a simplified optical measurement system. Instead of using sophisticated mass spectrometry or chromatography equipment, the invention uses basic optical principles (light absorption, scattering, plasmon resonance) measured by simple photodetectors or spectrometers, thereby reducing device complexity while maintaining detection precision
Solution Approach 2:
The invention shifts the detection parameter from complex physical measurements to optical parameter changes (absorbance, scattering intensity, resonance frequency). These optical parameters can be measured with simple, inexpensive equipment, eliminating the need for complex analytical instruments while maintaining high detection precision through the amplified optical signal from nanoparticles
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 enhances detection sensitivity, reduces the impact of non-specific adsorption, and enables rapid, cost-effective on-site analysis, improving the detection of analytes such as proteins, DNA, and metal ions with a low detection limit and short turnaround time.
Implementation Method 1
measuring evanescent wave energy of the optical waveguide element absorbed and/or scattered by the plurality of nanoparticles
Implementation Method 2
their light absorption properties are significantly changed and typically exhibit high absorbance to light in a special wavelength range
Implementation Method 3
measuring evanescent wave energy of the optical waveguide element absorbed and/or scattered by the plurality of nanoparticles
Implementation Method 4
This method uses noble metal nanoparticles to generate particle plasmon resonance (PPR) or localized surface plasmon resonance (LSPR) due to absorption of energy at a specific wavelength
Implementation Method 5
measuring evanescent wave energy of the optical waveguide element absorbed and/or scattered by the plurality of nanoparticles after the plurality of nanoparticles, the analyte, and the optical waveguide element forming the sandwich-like structure by using a photodetector to obtain a first signal
Data Source
AI summary
A method of measuring a concentration of an analyte is provided, including: reacting a test solution including an analyte with a nanoparticle solution including a plurality of nanoparticles and an optical waveguide element to form a sandwich-like structure; and measuring evanescent wave energy of the optical waveguide element absorbed and/or scattered by the plurality of nanoparticles after the plurality of nanoparticles forming the sandwich-like structure by using a photodetector to obtain a first signal, and calculating the concentration of the analyte based on the first signal. Wherein, a detection recognition element is conjugated on a surface of each of the plurality of nanoparticles, and a capture recognition element is conjugated on a waveguide surface of the optical waveguide element.