Nucleic Acid Purification via pH-Dependent Hydrogen Bonding
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Solution Overview
Problem
Current methods for isolating and purifying nucleic acids, such as genomic DNA, from complex samples are inefficient and require additional steps, harsh reagents, or specific pH conditions, which can compromise downstream processes like PCR.
Innovation Solution
A method using polymers with neutral charge that form hydrogen bonds with nucleic acids at low pH for binding and release at higher pH, allowing for direct amplification without extra steps, utilizing polymers like polyacrylic acid or carboxymethyldextran attached to magnetic beads or filters, enabling efficient separation and purification of nucleic acids of varying sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If magnetic beads are used to precipitate total DNA non-specifically, then DNA isolation is achieved, but additional centrifugation steps are required and purification efficiency is reduced
Solution Approach 1:
The patent replaces the mechanical centrifugation system with a magnetic field-based separation system. Magnetic beads functionalized with hydrogen-bonding ligands allow DNA to be captured and separated through magnetic field application alone, eliminating the need for centrifugation steps and significantly simplifying the workflow.
Solution Approach 2:
The invention uses composite magnetic beads coated with specific ligands (such as carboxyl groups or other hydrogen-bonding moieties) that combine the magnetic properties of the bead core with the selective binding capabilities of the surface ligands, enabling both efficient capture and magnetic separation in a single material system.
2Reliability
If ChargeSwitch ligand is used to bind nucleic acids at low pH, then selective binding is achieved, but harsh reagents and multiple steps are required for elution
Solution Approach 1:
The patent utilizes pH as a controllable parameter to regulate hydrogen bonding strength. At low pH, hydrogen bonds are strong enabling selective DNA binding; at neutral or physiological pH, hydrogen bonds weaken allowing easy elution. This single parameter change controls the entire binding-elution cycle without requiring harsh reagents or multiple chemical treatments.
Solution Approach 2:
Hydrogen bonds serve as an intermediary interaction mechanism between the ligand and nucleic acids. These reversible hydrogen bonds provide selective binding at low pH while allowing gentle elution at higher pH, avoiding the need for harsh chemical intermediaries or multiple processing steps.
3Quantity of substance
If conventional purification methods are used, then nucleic acids are isolated, but DNA integrity may be compromised for downstream PCR applications
Solution Approach 1:
The patent replaces mechanical shear forces from centrifugation and vortexing with gentle magnetic field-based manipulation. This mechanical substitution prevents DNA shearing and maintains integrity while still achieving efficient isolation and recovery of nucleic acids for downstream applications.
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 efficient purification and size separation of nucleic acids, suitable for PCR and sequencing, with minimal reagents and steps, maintaining DNA integrity and enabling analysis of low-concentration samples, including vaccine applications.
Implementation Method 1
reversibly binding said nucleic acid to said polymer by hydrogen bonding under pH conditions 5
Implementation Method 2
the ligand is bound to magnetic beads/particles
Data Source
AI summary
The present invention relates to a simple and efficient method to isolate and purify nucleic acids, preferably genomic DNA, from complex samples compared with available methods, by using a ligand which relies on hydrogen bonding to purify the nucleic acids. Preferably the ligand is bound to magnetic beads/particles. More closely the method comprises adding a sample comprising nucleic acid to a polymer having neutral charge; reversibly binding said nucleic acid to said polymer by hydrogen bonding under pH conditions <5; washing said polymer; and eluting said nucleic acid from said polymer under conditions of pH >5. The method is very suitable for sample preparation of nucleic acids, for example for PCR applications.