Nucleic Acid Purification Using Potassium Carbonate Elution
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Solution Overview
Problem
Current anion exchange chromatographic methods face impaired recovery of nucleic acids during the elution step from anion exchange resins, particularly for longer chain nucleic acids, where conventional high salt concentrations and alkaline conditions can lead to denaturation and incomplete recovery.
Innovation Solution
Incorporating potassium carbonate as an additive in the elution solution at a concentration of 0.1M-2M, maintaining a pH range of 9-13, specifically 10-12, to enhance the recovery of nucleic acids from anion exchange resins without causing stability issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high salt concentrations and alkaline conditions are used during elution, then nucleic acid recovery is improved, but nucleic acid stability deteriorates due to denaturation
Solution Approach 1:
The patent changes the chemical parameters of the elution solution by incorporating potassium carbonate to achieve a specific pH range (9-13, preferably 10-12). This parameter modification enables effective nucleic acid elution while maintaining stability, resolving the contradiction between recovery efficiency and nucleic acid integrity.
Solution Approach 2:
Potassium carbonate serves as an intermediary substance in the elution solution. It mediates between the need for high pH conditions to displace bound nucleic acids from the anion exchange resin and the need to maintain nucleic acid stability, achieving both goals simultaneously.
2Quantity of substance
If conventional elution methods are used, then procedure simplicity is maintained, but nucleic acid recovery is impaired
Solution Approach 1:
The patent modifies the elution solution parameters by adding potassium carbonate at specific concentrations (0.1M-2M) to achieve enhanced recovery. This parameter change improves nucleic acid recovery from 20-50% to 70-95% while maintaining a relatively simple elution procedure.
3Productivity
If strong alkaline conditions are applied to improve recovery, then nucleic acid elution efficiency increases, but nucleic acid denaturation occurs
Solution Approach 1:
The patent optimizes the pH parameter to a specific range (9-13, preferably 10-12) using potassium carbonate. This optimized parameter setting achieves high elution efficiency while preventing the excessive denaturation that occurs with stronger alkaline conditions.
Solution Approach 2:
The patent converts the potentially harmful effect of high pH (which can cause denaturation) into a beneficial elution mechanism. By carefully controlling the pH range through potassium carbonate addition, the high pH conditions become useful for displacing bound nucleic acids without causing excessive damage.
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 approach increases nucleic acid recovery from 20-50% to 70-95%, ensuring high recovery rates without compromising nucleic acid stability, as demonstrated by improved purification and downstream application compatibility.
Implementation Method 1
contacting the aqueous solution containing the nucleic acid with an anion exchanger bound to a solid support matrix under conditions such that the anion exchanger binds the nucleic acid
Implementation Method 2
the addition of a composition that increases the pH of the elution solution
Data Source
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AI summary
The invention provides an improved method for the purification of nucleic acid molecules, which method comprises generating a cellular lysate containing the nucleic acid; contacting the lysate with an anion exchanger bound to a solid support matrix under conditions such that the anion exchanger binds the nucleic acid; followed by eluting the nucleic acid from the anion exchanger with an aqueous mobile phase comprising an elution solution; and desalting the eluted nucleic acid such that it is suitable for downstream applications. The improvement of the method includes adding in the elution solution a composition such that the pH of the aqueous mobile phase is between about pH 9 and about pH 13, wherein the presence of the composition in the elution solution provides an increase in nucleic acid recovery, as compared with the recovery in the absence of the composition.