Functionalized FET Sensors for Cytokine Detection
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Solution Overview
Problem
Current methods for detecting cytokines and cholesterol in biofluids are costly, complex, require large sample volumes, and are not suitable for long-term or continuous monitoring, and are affected by environmental conditions such as temperature and pH.
Innovation Solution
Functionalized field-effect transistors (FETs) with molecularly imprinted polymer membranes and probe materials are used for selective detection and quantification of cytokines and lipoproteins in biofluids, enabling low-concentration detection, miniaturization, and stability across varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing methods (ELISA, ELISPOT, antibody arrays) are used for cytokine detection, then measurement accuracy is achieved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces complex mechanical/chemical assay systems (ELISA, ELISPOT) with an electronic field-effect transistor-based sensing system. The FET detects cytokines through electrical field interactions with biomolecules, eliminating the need for complex enzymatic reactions, colorimetric developments, and manual plate-based procedures, thereby maintaining measurement precision while dramatically reducing device complexity
Solution Approach 2:
The invention changes the detection parameter from optical/chemical signals (requiring complex reagents and equipment) to electrical field signals. By measuring changes in electrical properties (gate voltage, current) caused by cytokine binding to functionalized surfaces, the system achieves accurate detection with simpler device architecture
2Difficulty of detecting and measuring
If existing cytokine measurement techniques are used, then detection capability is achieved, but testing time and sample volume requirements increase
Solution Approach 1:
The FET-based sensor enables continuous real-time monitoring of cytokines in biofluids, eliminating the batch-processing nature of ELISA and ELISPOT. The sensor can continuously detect cytokine concentrations as they change, providing uninterrupted measurement data without requiring repeated sample collection and processing, thereby dramatically reducing total testing time
Solution Approach 2:
The invention extracts and isolates the essential detection function from the complex assay procedures. By using the FET's electrical field to directly interact with charged biomolecules (cytokines, lipoproteins), the system eliminates time-consuming steps such as sample preparation, reagent addition, incubation periods, and signal development, achieving rapid detection
3Measurement precision
If existing measurement materials are used, then single-use detection is achieved, but shelf life and reusability are limited
Solution Approach 1:
The patent creates stable, reusable copies of detection functionality by functionalizing the FET surface with robust molecularly imprinted polymers or aptamers. These functional layers can be repeatedly exposed to biofluid samples without degrading, allowing the same sensor to perform multiple measurements over extended periods, thereby extending the operational duration beyond single-use limitations
Solution Approach 2:
The FET sensor system is designed to maintain its detection capability autonomously over time. The functionalized surface continuously presents binding sites for cytokines and lipoproteins, and the electrical readout system automatically detects binding events without requiring periodic replacement of reagents or materials, enabling long-term stable operation
4Measurement precision
If existing cytokine measurement methods are used, then concentration measurement is achieved, but sensitivity to low concentrations is reduced
Solution Approach 1:
The patent employs signal amplification strategies where the binding of a single cytokine molecule to the functionalized FET surface induces a measurable electrical signal change. The field-effect transistor acts as a signal amplifier, converting weak binding events into strong electrical outputs that can be detected at very low concentration levels, effectively counterbalancing the low quantity of analyte
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 FET sensors allow for accurate, low-volume, and continuous monitoring of cytokines and lipoproteins with improved stability and reduced energy consumption, enabling non-invasive, on-body measurements and long-term use.
Implementation Method 1
functionalized field-effect transistors (FETs) with molecularly imprinted polymer membranes and probe materials are used for selective detection and quantification of cytokines and lipoproteins
Implementation Method 2
functionalized field-effect transistors (FETs) for selective detection and quantification of cytokines and lipoproteins in biofluids
Data Source
AI summary
Presented herein are systems, methods, and architectures related to functionalization of the metallic gates of field-effect transistors (FETs) and the use of the functionalized FETs as biochemical sensors in liquid samples. The functionalization can either be a molecularly imprinted polymer or a probe material. The functionalized FETs can be used in devices for analyte detection/quantification. In particular, the functionalized FETs are used in devices for the detection and/or quantification of cytokines (e.g. interleukin) and/or cholesterol (LDL or HDL).