Functionalized Beads for Microparticle Detection via Flow Cytometry
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Solution Overview
Problem
Current methods for detecting micro-particles, such as RT-PCR, have low sensitivity and specificity, are prone to false results due to minor mutations or DNA/RNA fragments, and are limited to specific pathogens, making them inadequate for rapid and accurate diagnosis of infections like COVID-19.
Innovation Solution
The use of functionalized beads to amplify phenotypic signals, allowing for the detection of micro-particles like viruses and bacteria through flow cytometry, independent of DNA or RNA composition, with the ability to detect multiple pathogens simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RT-PCR method is used for detection, then the detection can identify specific DNA or RNA sequences, but the sensitivity and specificity are low and false results occur due to mutations or DNA/RNA fragments
Solution Approach 1:
The patent replaces the biochemical PCR amplification system with a physical flow cytometry detection system. Instead of relying on DNA/RNA amplification and sequencing, the invention uses functionalized beads to capture microparticles and flow cytometry to detect their phenotypic characteristics (size, shape, surface properties), thereby eliminating false results from genetic mutations or fragments while maintaining detection accuracy.
Solution Approach 2:
The invention changes the detection parameters from genetic composition (DNA/RNA sequences) to phenotypic characteristics (physical and surface properties). By detecting microparticles based on their size, shape, and surface features rather than their genetic material, the method achieves higher reliability that is not affected by genetic mutations or residual DNA/RNA fragments from previous infections.
2Speed
If flow cytometry is used to detect microparticles directly, then the detection speed is fast, but the small size of pathogens makes them very difficult to detect
Solution Approach 1:
The patent applies the nesting principle by attaching small microparticle targets onto larger functionalized beads. The microparticles (viruses, bacteria) are captured and bound to the surface of beads that are large enough to be easily detected by flow cytometry. This nested structure allows the small, difficult-to-detect pathogens to be 'carried' by larger, easily detectable beads, thereby maintaining fast detection speed while improving detection capability.
Solution Approach 2:
The functionalized beads serve as an intermediary between the small microparticles and the flow cytometry detection system. The beads are functionalized with capture agents that specifically bind to microparticles, acting as a bridge that enables the detection of small pathogens without requiring direct detection of the pathogens themselves. This intermediary approach preserves detection speed while overcoming the size limitation.
3Measurement precision
If PCR-based genotypic method is used, then the detection is specific to DNA or RNA composition, but it provides false results in case of minor mutations or lingering DNA/RNA fragments
Solution Approach 1:
The patent replaces the biochemical PCR amplification system with a physical flow cytometry detection system. Instead of relying on DNA/RNA amplification and sequencing, the invention uses functionalized beads to capture microparticles and flow cytometry to detect their phenotypic characteristics (size, shape, surface properties), thereby eliminating false results from genetic mutations or fragments.
Solution Approach 2:
The invention changes the detection parameters from genetic composition (DNA/RNA sequences) to phenotypic characteristics (physical and surface properties). By detecting microparticles based on their size, shape, and surface features rather than their genetic material, the method achieves higher reliability that is not affected by genetic mutations or residual DNA/RNA fragments from previous infections.
4Adaptability or versatility
If current diagnostic methods are used, then the detection is limited to specific pathogens, but there remains a need for a method that covers a wide range of pathogens
Solution Approach 1:
The patent applies universality by designing a single flow cytometry-based platform that can detect multiple types of pathogens (viruses, bacteria, fungi) simultaneously. The functionalized beads can be configured with different capture agents to recognize various pathogens, and the flow cytometry system detects all of them using the same instrumentation and methodology, thereby achieving broad pathogen coverage without increasing system complexity.
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 method provides high sensitivity and specificity, reduces false readings, and enables the detection of a wide range of pathogens, including SARS-CoV-2, with a detection limit of 10 to 10^4 microparticles per ml, facilitating rapid and accurate diagnostic capabilities.
Implementation Method 1
The functionalized beads comprise beads coated with molecules of a capture agent, and at least some molecules of the capture agent bind to the target microparticle
Implementation Method 2
detecting the target microparticle-loaded beads using a flow cytometer
Implementation Method 3
The functionalized beads are capable of emitting a detectable signal
Data Source
AI summary
The methods, compositions and systems provided herein use functionalized beads to detect a target microparticle in a test sample, the method comprising (a) contacting the test sample containing the target microparticle with a plurality of functionalized beads. The size of the target microparticle is less than 1 μm. The functionalized beads comprise beads coated with molecules of a capture agent, and at least some molecules of the capture agent bind to the target microparticle, thereby forming target microparticle-loaded beads comprising the functionalized beads and the target microparticle. The method further comprises (b) detecting the target microparticle-loaded beads using a flow cytometer, thereby detecting the presence of the target microparticle in the test sample, and the target microparticle-loaded the beads are detected with the detection limit that ranges from 10 microparticles per ml to 10e4 microparticles per ml.