Cationic Polymer Surface Decontamination for PCR
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Solution Overview
Problem
Current methods for decontaminating surfaces used in PCR and related nucleic acid amplification techniques are inefficient, often requiring expensive and difficult-to-handle solutions, and can result in persistent contamination due to incomplete removal of nucleic acids, leading to false positive results.
Innovation Solution
A method utilizing cationic compounds, either in solution or as a coating on materials, to bind and retain nucleic acids on surfaces, preventing them from interfering in amplification reactions, using cationic polymers with molecular weights between 500 Da and 50 kDa, which are easy to use and effective in reducing contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If expensive and difficult-to-handle decontamination solutions are used, then nucleic acid degradation capability is improved, but ease of operation deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the decontamination solution by using common household substances (vinegar with pH 2-3, bleach with pH 11-12) at specific pH ranges to achieve effective nucleic acid degradation. This transforms the solution properties to be both effective and easy to handle, resolving the contradiction between degradation capability and ease of operation
Solution Approach 2:
The patent replaces expensive, specialized decontamination reagents with inexpensive, readily available household substances like vinegar and bleach. These common substances can be easily obtained and disposed of, eliminating the handling difficulties associated with expensive specialized reagents while maintaining decontamination effectiveness
2Quantity of substance
If prior art decontamination methods are used, then some nucleic acid removal is achieved, but reliability deteriorates due to persistent contamination
Solution Approach 1:
The patent identifies that prior art methods failed to achieve consistent decontamination due to inappropriate pH ranges. By changing the pH parameter to specific ranges (pH 2-3 for vinegar, pH 11-12 for bleach), the method achieves reliable and consistent nucleic acid degradation, eliminating persistent contamination while maintaining effective removal
Solution Approach 2:
The patent incorporates a verification step where decontamination effectiveness is tested by performing PCR amplification on the treated surface. This feedback mechanism allows users to confirm complete decontamination and repeat the process if necessary, ensuring reliable results and eliminating persistent contamination
3Reliability
If multiple cleaning steps are used, then nucleic acid removal is improved, but loss of time deteriorates
Solution Approach 1:
The patent combines the decontamination function into a single step by using household substances that simultaneously clean the surface and degrade nucleic acids through their extreme pH values. This merging of cleaning and decontamination functions into one step reduces the overall time required while maintaining effective nucleic acid removal
Solution Approach 2:
The patent employs substances like vinegar and bleach that perform self-service decontamination by leveraging their inherent chemical properties (extreme pH values) to degrade nucleic acids upon contact. This eliminates the need for multiple sequential cleaning steps, reducing time loss while ensuring thorough decontamination
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 significantly reduces nucleic acid contamination on surfaces, preventing interference in amplification reactions and reducing the need for additional cleaning steps, providing a cost-effective and reliable decontamination process.
Implementation Method 1
the cationic substance interacts with negative charges in the nucleic acid to non-specifically (i.e., not in any sequence dependent manner) bind the nucleic acid
Data Source
AI summary
The present invention relates to methods using cleaning compositions for the reduction of nucleic acid contamination. More particularly, the present invention relates to cationic compositions that bind to, and can remove, extraneous nucleic acids, polynucleotides, and DNA from the surface of a substrate. Preferably, the cationic compositions include a substance with a molecular weight of 500 Da or more. The present invention finds utility as a surface decontamination agent in PCR and other related DNA amplification techniques.