Airborne Pathogen Detection via Quartz Crystal Microbalance
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Solution Overview
Problem
Conventional tests for airborne respiratory diseases like COVID-19 are costly, inefficient, and lack sensitivity in detecting pathogens early, especially in high-risk areas, necessitating a more reliable and efficient method for pathogen detection in environments.
Innovation Solution
An electrochemical platform using a quartz crystal microbalance (QCM) with specific capture probes, such as molecularly imprinted polymers or metal-organic frameworks, to detect airborne pathogens by measuring mass changes caused by pathogen binding, enabling real-time detection and notification of excessive pathogen loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional tests are used for pathogen detection, then the testing process is simple and cost-effective, but the sensitivity is insufficient and requires substantial viral load for accurate detection
Solution Approach 1:
The system segments the detection process into multiple functional components: a flow regulator to control air sampling, a QCM sensor array with multiple probes for parallel pathogen detection, and a processor for data analysis. This segmentation enables enhanced detection sensitivity while maintaining manageable system complexity through modular design.
Solution Approach 2:
The patent introduces an intermediary capture membrane layer between the air sample and the QCM probes. This membrane selectively captures pathogens from the air stream, concentrating them on the sensor surface to enhance detection sensitivity without requiring complex pre-concentration equipment.
2Reliability
If regular screening of the population is performed, then pathogen detection coverage is increased, but the financial burden on the healthcare system increases
Solution Approach 1:
The patent replaces conventional mechanical testing procedures with an electrochemical QCM-based detection system. The QCM probes detect pathogen binding events through electrical impedance changes, enabling rapid, sensitive detection that reduces the need for extensive mechanical testing protocols and lowers overall testing volume requirements.
Solution Approach 2:
The system changes the detection parameter from direct viral load measurement to electrical impedance changes caused by pathogen binding to capture probes. This parameter transformation enables detection at lower pathogen concentrations and reduces the testing volume needed for reliable detection.
3Speed
If conventional tests are used, then the testing infrastructure is simple, but the detection time is prolonged and real-time detection is not achieved
Solution Approach 1:
The QCM sensor array operates continuously, monitoring electrical impedance changes in real-time as pathogens bind to the capture probes. This continuous detection mode eliminates the need for batch processing and provides immediate results, significantly improving detection speed while the modular design keeps system complexity manageable.
4Measurement precision
If individual testing is performed, then the detection accuracy for each individual is maintained, but the overall likelihood of detecting pathogen presence in an area is reduced
Solution Approach 1:
The QCM sensor array is designed with multiple probes that can simultaneously detect different pathogens or perform multiple detection functions within a single system. This multi-functionality allows the system to maintain high detection accuracy while improving overall detection efficiency by testing multiple targets in parallel.
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 system provides a cost-effective, sensitive, and efficient means to detect airborne pathogens, identifying high-risk zones and aiding in quarantine measures to reduce disease spread, with the ability to detect pathogens in their early stages and in high-density populations.
Implementation Method 1
an apparatus is provided. The apparatus includes a crystal microbalance (preferably a quartz crystal microbalance (QCM)) with one or more types of specific capture probes 250 adsorbed or attached to the (preferably gold) electrode on its surface
Implementation Method 2
which correlates to the amount of pathogen, and can be detected... cause a change in mass on the crystal microbalance which correlates to the amount of pathogen
Implementation Method 3
one or more types of specific capture probes 250 adsorbed or attached to the (preferably gold) electrode on its surface
Implementation Method 4
an oscillator connected to a pair of electrodes and configured to generate an alternating current (AC) voltage across a crystal of the crystal microbalance to cause the crystal to vibrate at a resonant frequency
Implementation Method 5
a frequency detection unit configured to measure a shift in the resonant frequency due to the change in the mass caused by the pathogen binding specifically to the probe(s) 250
Data Source
AI summary
An apparatus is provided for airborne pathogen detection, which includes a crystal microbalance. The apparatus includes specific capture probes that are affixed to the crystal microbalance and are designed to bind to and capture a specific pathogen, such as a virus particle. This capture causes a change in mass of the crystal microbalance that can be detected. A method is provided for airborne pathogen detection, which includes calibrating a resonant frequency of the crystal microbalance to a mass on the crystal microbalance. The method also includes a step of conjugating the antibody to the crystal microbalance. The method also includes, for each measurement time, measuring a resonant frequency of the crystal microbalance and determining a mass change due to binding of the pathogen to the detector. This mass change is then related to pathogen load in the medium. A notification is output if the viral load exceeds a predetermined threshold.