Multifunctionalized Silicon Nanoparticles for Sensitive ECL Immunoassays
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Solution Overview
Problem
There is a high need for more sensitive detection methods in electrochemiluminescence (ECL)-based immunoassays, particularly for improving the detection sensitivity and specificity of silicon nanoparticles in ECL-based immunoassays.
Innovation Solution
Development of multifunctionalized silicon nanoparticles with a silicon core of 1-10 nm, amine-terminated groups, affinity binding agents, and electrochemiluminescent compounds covalently bound via linkers, tailored for ECL-based detection methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ECL-based immunoassays use standard electrochemiluminescent compounds as labels, then the detection method is simple and easy to operate, but the detection sensitivity and specificity are insufficient
Solution Approach 1:
The patent employs composite silicon nanoparticles comprising a silicon core functionalized with multiple different electrochemiluminescent compounds (e.g., Ru(bpy)32+ and Ir(ppy)3) simultaneously bound to the nanoparticle surface. This composite approach enables multi-channel ECL detection with enhanced sensitivity and specificity, as different ECL compounds emit at distinct wavelengths allowing for multiplexed detection of multiple analytes in a single assay
Solution Approach 2:
The silicon nanoparticles are designed as universal platforms that can simultaneously bind multiple types of electrochemiluminescent compounds and multiple affinity binding agents (antibodies, antigens, etc.). This multi-functional design allows the same nanoparticle formulation to be used for detecting different analytes by simply changing the affinity binding agents, thereby improving detection sensitivity across various applications without requiring separate optimized systems for each analyte
2Measurement precision
If silicon nanoparticles are functionalized with multiple electrochemiluminescent compounds and affinity binding agents, then detection sensitivity and specificity improve, but the manufacturing process becomes more complex
Solution Approach 1:
The patent utilizes pre-functionalized silicon nanoparticles that are prepared in advance with specific surface groups (e.g., amine, carboxyl, or hydroxyl groups). These pre-functionalized nanoparticles serve as ready-to-use platforms that can subsequently be coupled with electrochemiluminescent compounds and affinity binding agents through standardized conjugation chemistry. This preliminary functionalization step simplifies the overall manufacturing process by eliminating the need for complex multi-step functionalization procedures for each application
Solution Approach 2:
The patent employs parameter optimization in the nanoparticle synthesis and functionalization process, including controlling the size of silicon nanoparticles (typically 10-100 nm), adjusting the surface charge density, and optimizing the ratio of different electrochemiluminescent compounds bound to the nanoparticle surface. By systematically optimizing these parameters, the patent achieves high detection specificity while maintaining a relatively streamlined manufacturing process that can be scaled up
3Quantity of substance
If the size of silicon core is reduced to increase surface area for drug loading, then capacity for analyte binding increases, but stability and handling of nanoparticles become more difficult
Solution Approach 1:
The patent employs a thin silicon oxide shell or organic ligand layer coating the silicon nanoparticle core. This thin film structure provides several benefits: it protects the small silicon core from aggregation and oxidation, improves colloidal stability in aqueous buffers, and provides additional surface functional groups for binding electrochemiluminescent compounds and affinity binding agents. The thin film maintains high surface area-to-volume ratio while enhancing overall nanoparticle reliability and handling characteristics
Solution Approach 2:
The patent creates composite structures by combining silicon nanoparticle cores with stabilizing shell materials (such as silica, polymers, or surfactant layers). This composite approach allows small nanoparticles (10-50 nm core size) to maintain high analyte binding capacity while the outer shell provides structural integrity, colloidal stability, and resistance to aggregation. The composite design effectively decouples the functions of high surface area (core) and stability (shell)
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
Enhances the sensitivity and specificity of ECL-based detection methods by optimizing the physical and chemical properties of silicon nanoparticles, allowing for improved detection of analytes in immunoassays.
Implementation Method 1
Electrogenerated chemiluminescence (also called electrochemiluminescence and abbreviated ECL) is the process whereby oxidized co-reactants generated at electrodes undergo high-energy electron-transfer reactions to form excited states of metal complexes that emit light
Implementation Method 2
from 1 to 10 affinity binding agents covalently bound to amine-terminated C3-C18 aminoalkyl groups, to amine-terminated 3-(2-amino-ethoxy)-propyl groups, to amine-terminated 3-[2-(2-amino-ethoxy)-ethoxy]-propyl groups or to amine-terminated 2-(4-amino-methyl-phenyl)-ethyl groups
Data Source
AI summary
The present disclosure relates to novel multifunctionalized silicon nanoparticles, to processes for their preparation and to compositions comprising the novel multifunctionalized silicon nanoparticles. The disclosure also relates to the use of the novel multifunctionalized silicon nanoparticles in electrochemiluminescence based detection methods and in the in vitro detection of an analyte. In particular, the disclosure relates to methods for measuring an analyte by in vitro methods employing the novel multifunctionalized silicon nanoparticles.