Enzymatic Amplification Cascade for Pathogen Detection
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Solution Overview
Problem
Current methods for detecting pathogens in food products are often expensive, time-consuming, and require thermal cycling devices, limiting their accessibility and efficiency for rapid and sensitive contamination assessment.
Innovation Solution
The use of an enzymatic amplification cascade of restriction endonucleases to detect target nucleic acid in food samples, allowing for the assessment of contamination without nucleic acid amplification techniques, enabling rapid, inexpensive, and specific detection of pathogens like Escherichia coli or Staphylococcus aureus in food products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If nucleic acid amplification techniques (PCR-based) are used to detect target nucleic acid, then detection sensitivity is improved, but equipment cost and operational complexity increase due to required thermal cycling devices
Solution Approach 1:
The patent replaces the thermal cycling mechanical system with an enzymatic amplification cascade using restriction endonucleases. Instead of using thermal cycling devices to amplify nucleic acid, the invention employs a series of enzymatic reactions that proceed at constant temperature, eliminating the need for complex thermal cycling equipment while maintaining detection sensitivity.
Solution Approach 2:
The patent introduces intermediary enzymatic reactions as mediators between target detection and signal generation. The enzymatic amplification cascade uses multiple intermediary steps (restriction endonuclease cleavage, probe hybridization, signal amplification) to achieve sensitive detection without requiring direct thermal cycling amplification of the target nucleic acid.
2Measurement precision
If conventional pathogen detection methods are used, then detection accuracy is maintained, but testing time is extended making the process time-consuming
Solution Approach 1:
The patent implements continuous enzymatic amplification reactions that proceed without interruption or thermal cycling pauses. The enzymatic cascade maintains continuous useful action through sequential enzyme reactions that amplify the detection signal continuously, reducing total testing time while preserving detection accuracy through multiple amplification stages.
Solution Approach 2:
The patent performs preliminary enzymatic amplification and probe hybridization steps before final detection. By preparing amplified products and hybridized probes in advance through the enzymatic cascade, the actual detection step can be performed rapidly, reducing overall testing time while maintaining accuracy through pre-amplification.
3Reliability
If PCR-based nucleic acid amplification techniques are used, then pathogen detection capability is improved, but operational cost increases due to expensive thermal cycling devices
Solution Approach 1:
The patent employs disposable enzymatic reagents and probes that can be prepared and used without expensive reusable thermal cycling equipment. The enzymatic amplification system uses inexpensive, stable reagents that do not require costly instrumentation, making the detection capability accessible at lower operational costs while maintaining reliability through robust enzymatic reactions.
Solution Approach 2:
The patent substitutes expensive mechanical thermal cycling systems with simple, low-cost enzymatic reaction systems. By replacing the need for thermal cyclers with enzymes that function at constant temperatures, the invention maintains pathogen detection capability while dramatically reducing equipment and operational costs.
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 method allows for rapid, sensitive, and specific detection of pathogens in food samples, reducing the need for expensive equipment and time-consuming processes, enabling effective contamination assessment in various food products and environments.
Implementation Method 1
target nucleic acid hybridizes to probe nucleic acid to form a double-stranded portion of nucleic acid
Implementation Method 2
recognition restriction endonuclease cleaves the double-stranded portion of nucleic acid at the restriction endonuclease cut site
Implementation Method 3
amplifying restriction endonuclease cleaves the reporter nucleic acid at the restriction endonuclease cut site of the amplifying restriction endonuclease
Data Source
AI summary
This document provides methods and materials for detecting contaminated food products. For example, methods and materials for using an enzymatic amplification cascade of restriction endonucleases to detect nucleic acid of a microorganism or virus (e.g., a pathogen) within a sample (e.g., food product sample) being tested, thereby assessing a food product for possible contamination are provided.