Enclosed Nucleic Acid Detection Unit Preventing Cross-Contamination
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Solution Overview
Problem
Conventional PCR techniques face challenges with contamination between laboratory amplification products, leading to false positives, which are difficult to prevent and result in ethical, social, and legal issues, especially in clinical applications, and require costly and skilled techniques like Fluorescence Quantitative PCR.
Innovation Solution
A totally enclosed detection unit using a test strip technique for rapid detection of nucleic acid amplification products, which prevents cross-contamination by sealing the reaction tube and outer casing, allowing for simple and quick operation without the need for specialized instrumentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional PCR detection methods are used with open-tube detection, then detection sensitivity is improved, but contamination between amplification products occurs leading to false positives
Solution Approach 1:
The detection system is segmented into separate functional zones: an amplification zone where PCR occurs in sealed tubes, and a detection zone with test strips. The amplification products remain contained in their original tubes while detection reagents are applied to the test strip, physically separating the amplification and detection processes to prevent cross-contamination.
Solution Approach 2:
A test strip acts as an intermediary medium between the amplification product and the detection system. The amplification product is transferred to the test strip where detection occurs, allowing the original sealed amplification tube to remain closed while still enabling detection, thus preventing contamination.
2Reliability
If UNG-dUTP system is used to prevent contamination, then false positives are reduced, but system complexity and reagent cost increase
Solution Approach 1:
The contamination prevention function is extracted from the amplification reagents and implemented through the physical separation of amplification and detection processes. Instead of modifying the PCR reagents with dUTP and UNG, the system uses sealed tubes and test strip detection to prevent contamination, simplifying the reagent system while maintaining reliability.
3Reliability
If Fluorescence Quantitative PCR is used for enclosed detection, then contamination is prevented, but instrument cost and operational complexity increase
Solution Approach 1:
The system uses disposable test strips that are discarded after a single use, eliminating the need for expensive, complex fluorescence detection instruments. The test strip provides all necessary detection functions in a simple, low-cost, single-use format, making enclosed detection accessible without requiring sophisticated equipment.
Solution Approach 2:
The complex optical and electronic detection system of fluorescence PCR is replaced with a simple visual detection system using test strips. The detection function is transferred from expensive instrumentation to simple visual observation of color changes or signal appearance on the test strip.
4Measurement precision
If conventional PCR with agarose gel electrophoresis is used, then detection capability is achieved, but operational time and labor intensity increase
Solution Approach 1:
The system skips the time-consuming steps of agarose gel preparation, electrophoresis running, and gel imaging. Instead, the test strip provides rapid detection within minutes by directly detecting amplification products in solution, eliminating the lengthy gel electrophoresis process while maintaining detection capability.
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 solution significantly reduces the risk of contamination, enhances detection accuracy, decreases costs, and simplifies the detection process, making it suitable for resource-limited settings and various fields like clinical diagnosis and life sciences.
Implementation Method 1
The invention also relates to a rapid detection kit and the use of the kit for rapid detection of a target nucleic acid amplification product in a enclosed rapid detection unit
Data Source
AI summary
The invention relates to a method for rapid detection of a target nucleic acid amplification product while preventing cross-contamination between target nucleic acid amplification products and avoiding false positives, comprising the steps of: a) leaving the reaction tube unopened after the amplification reaction is finished, so as to prevent the target nucleic acid amplification product from leaking out and resulting in contamination; b) placing the unopened reaction tube inside an enclosed unit, making the target nucleic acid amplification product be transferred to a test strip from the reaction tube in a physically enclosed environment; c) performing detection in a visual read-out manner, and determining the result; d) discarding the enclosed unit in a safety place as a whole without opening it after the detection. The invention also relates to a totally enclosed unit for detecting a target nucleic acid amplification product, and still relates to applications of the totally enclosed rapid detection unit in detection of infectious pathogens, food industry, agriculture, livestock husbandry, customs quarantine control, and determination of DNA.