Ethylene-Amine Binding for Nucleic Acid Recovery
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Solution Overview
Problem
Current nucleic acid isolation methods, particularly for challenging samples like Mycobacterium tuberculosis, face inefficiencies in binding nucleic acids to magnetic glass particles due to harsh lysis conditions, leading to false-negative results and impractical, non-automatable procedures.
Innovation Solution
The use of ethylene-amine compounds in conjunction with magnetic glass particles enhances nucleic acid binding efficiency, especially at high pH, by forming a binding mixture that includes metal salts like magnesium or manganese, facilitating efficient separation and isolation of nucleic acids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If harsh chemical treatment is used to break down cell walls and outer membranes, then nucleic acid isolation from challenging samples (fungi, plants, bacteria) is achieved, but nucleic acid degradation occurs and false-negative results are produced
Solution Approach 1:
The patent changes the pH parameter of the binding mixture to alkaline conditions (pH 8.0-10.0, preferably pH 9.0-10.0) to improve nucleic acid binding to magnetic glass particles. This parameter change allows effective binding without requiring harsh chemical treatments that would degrade the nucleic acids, thus resolving the contradiction between isolation efficiency and diagnostic accuracy.
Solution Approach 2:
The patent introduces ethylene-amine compounds as intermediaries in the binding mixture. These compounds facilitate nucleic acid binding to magnetic glass particles under alkaline conditions, enabling efficient isolation without harsh treatments. The ethylene-amine compound acts as a mediator that enables binding under milder, more nucleic acid-friendly conditions.
2Reliability
If multiple wash and centrifugation steps are performed to achieve sufficient sensitivity, then false-negative results are avoided, but the procedure becomes complex and non-automatable
Solution Approach 1:
The patent combines the binding and washing steps into a single integrated process. The magnetic glass particles with bound nucleic acids can be directly separated using a magnet, eliminating the need for multiple separate wash and centrifugation steps. This merging reduces procedural complexity while maintaining sensitivity, making the method amenable to automation.
3Productivity
If prolonged incubation is performed to improve binding efficiency at high pH, then nucleic acid recovery is enhanced, but the procedure time increases and automation becomes difficult
Solution Approach 1:
The patent optimizes the incubation time parameter to 5-30 minutes at alkaline pH (9.0-10.0), which provides sufficient binding efficiency without requiring prolonged incubation. This optimized parameter combination enhances nucleic acid recovery while keeping the procedure time short enough for automation, resolving the contradiction between recovery efficiency and procedure time.
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 significantly improves nucleic acid recovery and binding efficiency, even at high pH, making the process more automatable and sensitive, reducing the risk of false-negative results and stabilizing nucleic acid templates.
Implementation Method 1
contacting the sample solution with a solid phase capable of binding nucleic acids
Implementation Method 2
These MGPs consist of a ferromagnetic core coated with silica-based glass-like material
Data Source
AI summary
The present invention is a method of separating nucleic acids using a solid phase capable of binding nucleic acids, such as magnetic glass particles, where binding of nucleic acids to the solid phase is enhanced by the presence of an ethylene-amine compound. The invention further includes a reaction mixture for isolating nucleic acids containing an ethylene-amine compound and kits for carrying out the method.