Immunomagnetic Capture for Rapid Optical Pathogen Detection
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Solution Overview
Problem
Conventional methods for detecting foodborne pathogens in water and food samples require long times and additional enrichment steps, making them inefficient and time-consuming.
Innovation Solution
A method using immunomagnetic separation (IMS) with magnetic particles coated with antibodies to capture pathogens, followed by enzyme-based detection, allowing for rapid and accurate detection of pathogens like E. coli O157:H7 at low concentrations, combined with an optical detection platform for quantification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional methods are used for detecting foodborne pathogens, then detection accuracy can be achieved, but detection time is excessively long and requires additional enrichment steps
Solution Approach 1:
The patent applies preliminary action by pre-coating magnetic particles with capture antibodies before sample introduction. This pre-preparation of the detection platform eliminates the need for time-consuming enrichment steps, as the magnetic particles are ready to immediately capture target pathogens upon sample addition, thereby reducing overall detection time while maintaining accuracy
Solution Approach 2:
The patent extracts the enrichment step from the conventional detection workflow by using magnetic particles with high binding affinity to directly capture and concentrate target pathogens from diluted samples. This extraction of the enrichment function allows the method to achieve both rapid detection and high sensitivity without requiring separate enrichment incubation periods
2Measurement precision
If sample enrichment is performed to meet minimal detectible levels, then detection sensitivity is improved, but additional time is required
Solution Approach 1:
The patent uses magnetic particles as an intermediary between the sample and detection system. These particles are pre-coated with capture antibodies that have high affinity for target pathogens, enabling them to efficiently bind and concentrate even low levels of pathogens directly from the sample without requiring time-consuming enrichment incubation
Solution Approach 2:
The patent changes the binding parameter of the detection system by using magnetic particles with optimized antibody coating that provides high binding affinity and capacity. This parameter optimization allows the system to achieve detection of low pathogen concentrations (one viable cell per 125-425 g sample) without requiring sample enrichment, thereby eliminating the time loss associated with enrichment steps
3Reliability
If complex detection procedures are used to ensure accuracy, then detection reliability is improved, but operational simplicity is reduced
Solution Approach 1:
The patent merges multiple detection steps into a single integrated procedure. The magnetic particles combine capture antibody functionality with detection signal generation, allowing sample preparation, pathogen capture, and detection to occur in one continuous process rather than requiring separate enrichment, capture, and detection steps that demand complex operational procedures
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 method enables fast and accurate detection of pathogens in as little as 30 minutes, with a low false negative rate, and can be performed on-site with minimal technical expertise, suitable for detecting low counts of viable cells in food samples.
Implementation Method 1
a capture antibody, which specifically binds to an antigen on the food-borne pathogen, in conditions sufficient to form a first complex between the pathogen and the capture antibody when the food-borne pathogen is present at a concentration as low as one viable cell per 125 g for up to 425 g of the sample, and wherein the capture antibody is linked to an immobilization moiety
Implementation Method 2
a detector antibody is added. The detector antibody is linked to a detection moiety and specifically binds at a distinct site on the same antigen to which the capture antibody specifically binds
Data Source
AI summary
Provided are novel methods for screening and testing for pathogens in food, water, and bodily fluids using methods that are faster to complete than conventional methods of culturing and plating that require lengthy times in properly equipped labs. The invention utilizes specific, rapid and sensitive optical detection to capture small concentrations of the target bacteria and render them amenable for detection with various specific synthesis binding agents approaches. The technique merges capture and detection steps with quantification unit suitable to provide results in a relatively shorter time current detection methods.