Continuous Oligonucleotide Flow Synthesis for GMP Scale-Up
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Solution Overview
Problem
Existing methods for synthesizing oligonucleotides, particularly in large scales, face challenges such as high costs, complex multi-stage processes, and the need for large facilities, which are not suitable for producing nucleic acid active pharmaceutical ingredients at a Good Manufacturing Practice (GMP) grade.
Innovation Solution
A continuous oligonucleotide synthesizer using a liquid-phase flow method that integrates multiple reaction and purification steps in a single device, allowing for large-scale synthesis with fewer steps and reduced space requirements, including containers for reagents and waste management, and continuous monitoring for high purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If solid-phase synthesis method is used, then chain elongation can be achieved easily, but it is difficult to scale up and requires excessive reagents leading to high costs
Solution Approach 1:
The patent transitions from solid-phase to liquid-phase synthesis, fundamentally changing the physical state parameter of the reaction medium. This enables continuous flow processing and scalable production while maintaining chain elongation efficiency through optimized liquid-phase reaction conditions
Solution Approach 2:
The invention implements continuous flow synthesis where reactants continuously flow through reaction zones, enabling uninterrupted chain elongation. This continuous operation mode allows for scalable production without the batch-wise limitations of solid-phase methods, directly addressing the scale-up challenge
2Productivity
If liquid-phase batch synthesis method is used, then large-scale synthesis can be performed, but a large number of steps including purification are required
Solution Approach 1:
The patent integrates multiple synthesis and purification operations into a single continuous flow system. Reaction, deprotection, and purification steps are merged into sequential flow modules, reducing the number of discrete steps and equipment while maintaining large-scale production capability
Solution Approach 2:
The continuous flow synthesizer performs multiple functions including chain elongation, deprotection, and purification within a single integrated system. This multi-functional device eliminates the need for separate equipment for each operation, simplifying the overall process while enabling large-scale synthesis
3Manufacturing precision
If multi-stage synthesis is performed to remove impurities, then product purity can be improved, but process complexity and facility requirements increase
Solution Approach 1:
The patent employs continuous purification within the flow system where impurities are continuously removed as the reaction progresses. This continuous purification approach maintains high product purity without requiring discrete batch purification steps, reducing process complexity while achieving the desired manufacturing precision
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
Enables efficient, large-scale synthesis of oligonucleotides with high purity and reduced environmental impact, meeting GMP standards with fewer operational steps and lower facility needs.
Implementation Method 1
liquid feeding devices are connected to the pipes extending from the raw material container, the first reagent container, the second reagent container, and the third reagent container, respectively, wherein the liquid feeding device feeds the solution held in the container to the reaction tube connected to the corresponding pipe
Implementation Method 2
a nucleotide chain elongation reaction is performed using the raw material mixture in the first reaction tube to introduce a solution containing a resultant chain elongated product to the second reaction tube
Implementation Method 3
the oxidizing or sulfurizing reaction of the chain elongated product is performed in the second reaction tube
Data Source
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Figure 3A
AI summary
A continuous oligonucleotide synthesizer of the present invention comprises: a raw material container that holds a protected nucleoside block as a raw material; a first reagent container that holds a first reagent to be used in chain elongation of the protected nucleoside block; a second reagent container that holds a second reagent for an oxidizing or sulfurizing reaction of a phosphate binding moiety of an elongated nucleotide resulting from the chain elongation; and a third reagent container that holds a third reagent for a deprotecting reaction of the elongated nucleotide having been oxidized or sulfurized, in which an oligonucleotide is synthesized by a flow method by continuously supplying the raw material, the first reagent and the second reagent.