Multifrequency Impedance Cytometry for Biomarker Detection
Solution Overview
Problem
Current diagnostic technologies lack the ability to accurately and efficiently detect multiple biomarkers simultaneously, which is essential for diagnosing complex diseases, due to limitations in multiplexing capabilities and the need for invasive procedures.
Innovation Solution
A multifrequency impedance cytometry system using metal oxide Janus particles (MOJPs) that are semi-coated with different thicknesses of metal oxides, functionalized with antibodies to target specific cell surface receptors, and differentiated using machine learning algorithms, allowing for the simultaneous detection and classification of cells based on surface antigens and bound analytes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If flow cytometry with fluorophore-conjugated antibodies is used to detect cells expressing specific antigens, then detection accuracy of surface antigens is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the optical detection system (fluorophores, lasers, photodetectors) with an electrical impedance-based detection system. Microparticles with different metal oxide coatings produce frequency-specific impedance responses that can be detected by simple electrodes, eliminating the need for complex optical components while maintaining detection accuracy.
Solution Approach 2:
The patent changes the detection parameter from optical properties (fluorescence intensity) to electrical properties (impedance at different frequencies). By measuring impedance responses at multiple frequencies, the system can distinguish between different cell types and microparticle conjugates based on their unique electrical signatures rather than optical signals.
2Measurement precision
If multiplexing capability is added to detect multiple biomarkers simultaneously, then diagnostic accuracy for complex diseases is improved, but device complexity and operational difficulty increase
Solution Approach 1:
The patent segments the detection of multiple biomarkers into distinct frequency channels. Each microparticle type with a specific metal oxide coating responds preferentially at a particular frequency, allowing multiple biomarkers to be detected simultaneously by measuring impedance at different frequencies rather than requiring multiple physical detection systems.
Solution Approach 2:
The patent creates a universal detection platform where a single impedance cytometer can detect multiple types of biomarkers through frequency-multiplexed microparticles. The same device and detection circuitry can identify different cell types, surface antigens, and analytes by analyzing the impedance response spectrum, eliminating the need for multiple specialized instruments.
3Measurement precision
If traditional flow cytometry instruments are used, then detection capability is improved, but portability and ease of operation deteriorate
Solution Approach 1:
The patent replaces the complex mechanical and optical systems of traditional flow cytometers with a simplified electrical impedance measurement system. The core detection function is achieved through basic electrical components (electrodes, signal generator, impedance meter) that can be miniaturized and operated without the bulky optical infrastructure required by conventional flow cytometry.
Solution Approach 2:
The patent enables the detection system to automatically differentiate between cell types and microparticle conjugates through frequency-specific impedance measurements without requiring complex sample preparation or operator intervention. The system self-distinguishes targets based on their inherent electrical properties at different frequencies, reducing operational 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 approach enables high-accuracy detection and quantification of multiple biomarkers with high precision and sensitivity, reducing costs and improving portability, achieving over 90% accuracy in differentiating cell-MOJP conjugates and identifying receptor expression densities, thus enhancing diagnostic capabilities for complex diseases.
Implementation Method 1
Each type of probe microparticle includes a core and at least a partial metal oxide coating. One or more of the multiple frequencies correspond to respective types of probe microparticles. Responsive to applying the electric field, the method then measures a response signal.
Implementation Method 2
The impedance signature of the cell-microparticle complex is dominated by the microparticles, given that microparticles are much smaller than the cells
Implementation Method 3
Cells express surface antigens that can be recognized and captured by antibodies conjugated to the microparticles
Data Source
AI summary
Embodiments include methods, systems, and computer program products for detecting probe microparticle(s). One such embodiment applies an electric field to a biological entity. The electric field includes multiple frequencies. One or more of the multiple frequencies correspond to respective types of probe microparticles. Each type of probe microparticle includes a core and at least a partial metal oxide coating. Further, each type of probe microparticle is configured to produce a response corresponding to a respective frequency and conjugate to a corresponding type of biological entity. Responsive to applying the electric field, a response signal is measured. Then, based on the measured response signal, a presence or absence of probe microparticle(s) conjugated to the biological entity is detected.