Aptamer Biosensor for Rapid Salmonella Detection
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Solution Overview
Problem
Current methods for detecting Salmonella enterica bacteria in food samples are often labor-intensive, require trained technicians, and are not highly automated, making them unsuitable for rapid, in-situ testing at points of inspection like ports or shipping stations.
Innovation Solution
A portable, automated system using aptamer-based biosensors integrated into a specimen cup lid, which employs capacitance measurements to detect Salmonella enterica bacteria through aptamer binding to outer membrane proteins, allowing for wireless transmission of results and minimal training requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional DNA-based methods or immunoassay methods are used for Salmonella detection, then measurement precision is improved, but device complexity and loss of time increase due to laboratory requirements and manual processing
Solution Approach 1:
The patent replaces complex mechanical laboratory systems with a portable electrochemical biosensor system. The biosensor uses electrochemical principles to detect Salmonella through aptamer binding, eliminating the need for complex DNA extraction equipment, incubators, and manual processing steps while maintaining detection accuracy.
Solution Approach 2:
The patent extracts the essential detection function from complex laboratory procedures by using aptamers that can directly bind to Salmonella outer membrane proteins. This extraction allows detection to occur in simple field conditions without requiring complex laboratory infrastructure, thereby reducing device complexity while preserving measurement precision.
2Measurement precision
If traditional testing methods are used, then measurement precision is improved, but loss of time increases due to multiple-day testing periods and manual processing requirements
Solution Approach 1:
The patent employs preliminary action by pre-incubating the sample with aptamers before detection. The aptamers are designed to bind specifically to Salmonella outer membrane proteins, and the binding occurs rapidly under controlled conditions, significantly reducing the total testing time compared to traditional methods that require days for culture growth or DNA extraction.
Solution Approach 2:
The patent substitutes time-consuming mechanical laboratory processes with rapid electrochemical detection. The biosensor detects Salmonella through electrical signal changes caused by aptamer binding, which occurs much faster than traditional culture-based methods or DNA amplification techniques, thereby reducing loss of time while maintaining detection accuracy.
3Productivity
If automated systems are implemented, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service automation where the biosensor system automatically performs sample processing, detection, and result interpretation without requiring skilled technicians. The system includes automated incubation, electrochemical measurement, and data processing functions that operate autonomously, thereby improving productivity without proportionally increasing device complexity.
Solution Approach 2:
The patent creates a universal biosensor system that can handle multiple functions including sample incubation, aptamer binding, electrochemical detection, and data processing within a single integrated device. This multi-functionality improves productivity by eliminating the need for separate laboratory equipment while keeping device complexity manageable through unified design.
4Productivity
If in-situ testing is enabled, then productivity is improved, but manufacturing precision requirements increase for portable device integration
Solution Approach 1:
The patent applies segmentation by dividing the testing system into modular components: a portable biosensor unit, a separate incubation chamber, and a data processing system. This segmentation allows each component to be manufactured and tested independently, reducing the overall manufacturing precision requirements for integration while enabling rapid in-situ testing through efficient component assembly.
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
Enables rapid, accurate, and automated detection of Salmonella enterica bacteria in food samples, facilitating real-time monitoring and reducing the risk of contamination by allowing testing at various points of the food supply chain without the need for laboratory settings.
Implementation Method 1
aptamer binding to outer membrane proteins
Implementation Method 2
employs capacitance measurements to detect Salmonella enterica bacteria
Data Source
AI summary
An aptamer-based solid-state electrochemical biosensor for label-free detection of Salmonella enterica serovars utilizing immobilized aptamers. The device is realized by forming a matrix array of parallel capacitors, thus allowing the realization of low-cost, portable, fully integrated devices. Protein-aptamer binding modulates the threshold voltage of a circuit, changing the impedance (capacitance) of the circuit. This circuit is further characterized by an electrode coded with a p-Si substrate, enhancing the affinity between the Salmonella outer membrane proteins (OMPs) and the aptamer. An aptamer embedded detection plate is configured within a testing lid device that fits a standard, commercially available polymer specimen jar. A sample is mixed with broth for incubation and cultivation of any present Salmonella bacteria to obtain acceptable concentration of the pathogen for testing. The information obtained can then be transmitted by wireless network.