Quantum Dot-Polymer Diagnostic Kit for Single-Area Multiplex Detection
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Solution Overview
Problem
Existing diagnostic kits using semiconductor nanoparticles face challenges such as toxicity issues, non-specific antigen-antibody reactions, and increased test volume and time due to multiple reaction areas, limiting their effectiveness in simultaneous detection of multiple disease factors.
Innovation Solution
A multiple diagnostic kit utilizing quantum dot-polymer composites with a 3D self-assembly structure, composed of indium phosphide core quantum dots and surface-modified ligands, allows for simultaneous detection of multiple targets through independent luminescence characteristics, using antibodies specifically bound to the composite.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple reaction areas (conjugate pads and detection units) are formed on a strip to simultaneously test multiple disease factors, then the detection capability for multiple targets is improved, but the length of the strip increases, causing increased test volume of biological sample and reaction time
Solution Approach 1:
The patent combines multiple detection functions into a single reaction area by using quantum dots with different emission wavelengths as labels. Instead of creating separate conjugate pads and detection units for each target, the invention uses a single conjugate pad where antibodies conjugated to different colored quantum dots can simultaneously detect multiple disease factors, thereby reducing strip length while maintaining multi-target detection capability
Solution Approach 2:
The quantum dot labels serve multiple functions simultaneously - they provide fluorescent signaling for detection, enable differentiation of multiple targets through wavelength variation, and can be conjugated to different antibodies for various disease factors. This multi-functionality allows a single reaction area to perform what previously required multiple separate areas
2Adaptability or versatility
If multiple reaction areas are formed on a strip to simultaneously test multiple disease factors, then the detection capability is improved, but the reaction time increases
Solution Approach 1:
By merging multiple detection functions into a single reaction area using multi-wavelength quantum dots, the patent enables all target detections to occur simultaneously in one location rather than sequentially across multiple areas, thereby reducing the overall reaction time while maintaining the ability to detect multiple disease factors
3Adaptability or versatility
If multiple reaction areas are formed on a strip to simultaneously test multiple disease factors, then the detection capability is improved, but non-specific antigen-antibody reactions increase, leading to deterioration of test accuracy
Solution Approach 1:
The patent reduces non-specific reactions by consolidating detection into a single reaction area with controlled antibody-quantum dot conjugates. This approach minimizes the exposure of multiple antibody types to complex sample matrices compared to multiple separate reaction areas, thereby reducing opportunities for non-specific binding while maintaining multi-target detection through wavelength-resolved fluorescent signals
4Measurement precision
If CdSe-based toxic QDs are used as fluorescent materials to improve diagnostic sensitivity, then the detection sensitivity is improved, but toxicity issues arise, making commercialization difficult
Solution Approach 1:
The patent changes the material composition parameter of quantum dots from toxic CdSe-based materials to biocompatible alternatives such as carbon dots, silicon dots, or polymer-encapsulated quantum dots. This parameter change maintains the size-tunable fluorescent properties and high quantum yield needed for sensitive detection while eliminating the toxicity issue that prevented commercialization of earlier QD-based diagnostic kits
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 kit enables efficient, simultaneous detection of multiple targets with high sensitivity and accuracy by leveraging the quantum dot-polymer composite's photostability and independent luminescence properties, reducing non-specific reactions and test duration.
Implementation Method 1
quantum dots (QDs) exhibit fluorescence with a high quantum yield
Implementation Method 2
the quantum dot-polymer composite's photostability and independent luminescence properties
Data Source
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AI summary
The present invention relates to a kit for multiple detection of target specimens, comprising a plurality of conjugates for immune detection, the kit comprising a quantum dot-polymer composite, and an antibody conjugated to the surface of the quantum dot-polymer composite and specifically binding to a target specimen. Specifically, in the kit for multiple detection of target specimens, the quantum dot-polymer composite comprises three-dimensional self-assembled quantum beads composed of one or more quantum dots of an indium phosphide core-shell structure, surface-modified ligands placed on the surfaces of the quantum dots and one or more polymer ligands, the hydrodynamic diameter of the quantum beads is 270-300 nm, and the plurality of conjugates for immune detection have emission wavelengths that vary according to the type of target specimen.