Composite Particles Enhance Biologic Assay Sensitivity
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Solution Overview
Problem
Current point-of-care diagnostic tools face limitations in sensitivity due to the use of traditional organic labels, which have low absorption or emission efficiency and large spectral bands, making it difficult to detect very diluted biological materials effectively.
Innovation Solution
The development of composite particles with a matrix and nanoparticles that selectively absorb or emit light, featuring a high weight fraction of nanoparticles, such as quantum dots or metallic nanoparticles, to enhance optical response and sensitivity, allowing for the detection of a single molecule of biological material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional organic labels are used in assays, then the assay can be performed with simple equipment, but the sensitivity is limited due to low absorption or emission efficiency
Solution Approach 1:
The patent uses composite particles consisting of a polymer core combined with fluorescent nanoparticles (quantum dots, gold nanoparticles, or fluorescent proteins) embedded in or attached to the polymer matrix. This composite structure combines the biocompatibility and functionalizability of polymers with the high optical efficiency of inorganic nanoparticles, achieving enhanced fluorescence intensity and absorption cross-section while maintaining compatibility with simple detection equipment
Solution Approach 2:
The patent changes the optical parameters of the label by replacing traditional organic dyes with inorganic nanoparticles that have narrower emission bands and higher quantum efficiency. The fluorescent nanoparticles provide intense optical signals with specific wavelengths that can be detected with simple optical devices, directly addressing the sensitivity limitation of organic labels
2Measurement precision
If traditional organic labels are used, then the assay structure remains simple, but the absorption or emission bands are large and cannot be easily designed to correspond to a predetermined light wavelength
Solution Approach 1:
The patent changes the spectral properties of the label by using fluorescent nanoparticles with tunable emission wavelengths. Quantum dots, for example, can be synthesized with specific sizes that correspond to predetermined wavelengths, allowing the assay to be optimized for specific detection wavelengths without complicating the overall assay structure
Solution Approach 2:
The patent applies different optical properties to different parts of the detection system by using nanoparticles with specific emission characteristics matched to the detection wavelength. This localized optimization of optical properties at the nanoparticle level allows precise wavelength correspondence without requiring complex system-wide modifications
3Measurement precision
If traditional organic labels are used, then the assay is cost-effective, but the absorption or emission efficiency is low resulting in very low signal for optical detector
Solution Approach 1:
The patent combines polymer matrices with high-efficiency fluorescent nanoparticles to create composite labels that maintain cost-effectiveness while dramatically improving optical efficiency. The inorganic nanoparticles provide high quantum efficiency and intense signals, overcoming the energy loss limitations of organic dyes without requiring expensive specialized equipment
Solution Approach 2:
The patent changes the energy efficiency parameter by replacing organic labels with inorganic fluorescent nanoparticles that have higher quantum efficiency and narrower emission bands. This results in stronger signals for optical detectors while maintaining the cost-effectiveness of point-of-care diagnostic applications
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 improves the sensitivity of assays by providing an intense optical signal, enabling the detection of very diluted biological materials with enhanced fluorescence intensity and absorption cross-section, leading to more reliable and sensitive diagnostic results.
Implementation Method 1
nanoparticles that selectively absorb or emit light
Implementation Method 2
enhanced fluorescence intensity
Implementation Method 3
detection may be done by eye or with simple optical devices using absorption or fluorescence of labels and a detector
Data Source
Figure 1~2a
Figure 2b~2d
Figure 2e~2f
AI summary
The present invention relates to composite particles comprising nanoparticles dispersed in a matrix and their use in biologic assay.