Mixed-Mode Nucleotide Purification for High-Purity Oligonucleotide Yield
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Solution Overview
Problem
The high production cost of oligonucleotides, such as mRNA, is a challenge due to the inefficiencies in existing purification methods, which do not effectively remove contaminants like macromolecules and nucleotides, leading to low yields and purity.
Innovation Solution
A mixed-mode purification system involving chromatography and tangential flow filtration is employed to collect and purify oligonucleotides, utilizing mixed-mode resins with hydrophobic and anion exchange properties, followed by multiple washes and buffer exchanges to achieve high purity and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing purification methods are used, then the production process is simple, but the purity and yield of oligonucleotides are low due to ineffective contaminant removal
Solution Approach 1:
The patent combines multiple purification mechanisms into a single mixed-mode resin that integrates hydrophobic interaction chromatography and anion exchange chromatography properties. This merging of functions allows the resin to bind and remove multiple types of contaminants (proteins, rNTPs, macromolecules) simultaneously through different binding mechanisms, achieving high purity without requiring multiple separate purification steps
Solution Approach 2:
The mixed-mode resin is a composite material that incorporates both hydrophobic and charged functional groups within its structure. This composite design enables the resin to interact with contaminants through multiple mechanisms (hydrophobic interactions and electrostatic interactions), significantly improving contaminant removal efficiency and oligonucleotide purity compared to single-mode resins
2Productivity
If existing purification methods are used, then the equipment and process are simple, but the yield is low due to contaminant co-precipitation
Solution Approach 1:
The mixed-mode resin selectively extracts contaminants (proteins, rNTPs, macromolecules) from the reaction mixture through specific binding interactions. The hydrophobic regions bind proteins and the anion exchange regions bind rNTPs, effectively separating these contaminants from the oligonucleotide product. This selective extraction prevents contaminant co-precipitation during subsequent purification steps, maintaining high yield
Solution Approach 2:
The mixed-mode resin acts as an intermediary medium that facilitates the separation of contaminants from oligonucleotides. By providing multiple binding modes within a single resin matrix, it mediates the selective retention of different contaminant types while allowing the oligonucleotide to pass through or be selectively eluted, thereby preventing unwanted co-precipitation
3Manufacturing precision
If multiple purification steps are added to improve purity, then the production cost increases, but the process becomes more complex
Solution Approach 1:
The mixed-mode resin performs multiple purification functions simultaneously - it removes proteins through hydrophobic interactions, removes rNTPs through anion exchange, and eliminates macromolecular contaminants. This multi-functionality in a single purification medium eliminates the need for multiple separate purification steps, reducing both process complexity and production costs while achieving high purity
Solution Approach 2:
The patent merges hydrophobic interaction chromatography and anion exchange chromatography into a single mixed-mode system. This consolidation of multiple purification mechanisms into one step reduces the number of required purification stages, minimizing equipment needs, operational complexity, and overall production costs while maintaining high purity standards
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 achieves oligonucleotide purities greater than 99.5% and yields exceeding 90%, significantly reducing production costs by effectively removing contaminants like rNTPs and proteins.
Implementation Method 1
mixed-mode resins with hydrophobic and anion exchange properties
Implementation Method 2
mixed-mode resins with hydrophobic and anion exchange properties
Implementation Method 3
tangential flow filtration is employed to collect and purify oligonucleotides
Data Source
AI summary
This disclosure relates to purification of nucleotides using mixed mode resins.