Oligonucleotide UF/DF Salt Control via Competitive Buffer
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Solution Overview
Problem
Current methods for preparing high-purity oligonucleotide compositions, such as Spinraza®, face challenges in integrating ultrafiltration/diafiltration (UF/DF) with lyophilization processes, particularly in controlling salt content and achieving desired concentrations for large-scale production without additional processing steps.
Innovation Solution
The method involves using ultrafiltration/diafiltration to concentrate and buffer exchange oligonucleotides, controlling sodium and acetate content through the composition of the aqueous buffer solution, which includes competitive salts like ammonium acetate, to achieve the desired salt levels in the retentate and subsequent lyophilized product, thereby eliminating the need for solvent-based precipitation steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ultrafiltration/diafiltration is used to concentrate and buffer exchange oligonucleotides, then productivity is improved, but controlling salt content becomes difficult
Solution Approach 1:
The patent applies parameter changes by carefully controlling the composition of the aqueous buffer solution, specifically the concentration of salts like sodium acetate and ammonium acetate, to achieve precise control over the final salt content in the oligonucleotide composition while maintaining high productivity through UF/DF
Solution Approach 2:
The patent uses an intermediary aqueous buffer solution containing specific salts as a mediator during the UF/DF process. This buffer acts as an intermediate medium that enables both efficient concentration/exchange and precise salt content control, resolving the contradiction between productivity and manufacturing precision
2Manufacturing precision
If additional processing steps are added to control salt content, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the concentration, buffer exchange, and salt content control functions into a single integrated UF/DF process step. By combining these operations and controlling the buffer composition, the patent eliminates the need for separate additional processing steps, thereby maintaining manufacturing precision while reducing device complexity
Solution Approach 2:
The aqueous buffer solution serves multiple functions simultaneously: it acts as the medium for UF/DF operation, provides the desired salt content, and enables precise control over the final composition. This multi-functionality eliminates the need for separate processing steps and equipment
3Manufacturing precision
If solvent-based precipitation is used, then purity is improved, but loss of substance increases
Solution Approach 1:
The patent replaces the mechanical/chemical precipitation process with a membrane-based UF/DF process. This substitution maintains high purity through the selective membrane filtration while avoiding the substantial losses associated with precipitation, thereby improving both purity and reducing substance loss
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 allows for precise control of salt content and efficient operation of the UF/DF process, enabling the production of oligonucleotide compositions with predetermined sodium and acetate specifications, suitable for large-scale manufacturing without additional equipment or steps, and ensures stability and purity of the final lyophilized product.
Implementation Method 1
subjecting an aqueous solution of the oligonucleotide to ultrafiltration/diafiltration (UF/DF) to form a retentate comprising the oligonucleotide
Implementation Method 2
the ultrafiltration/diafiltration (UF/DF) is carried out using an aqueous buffer solution comprising one or more salts
Data Source
AI summary
Disclosed herein are methods for preparing compositions containing oligonucleotides. Methods of this disclosure involve subjecting an aqueous solution of a oligonucleotide to ultrafiltration/diafiltration (UF/DF) in order to form a retentate containing the oligonucleotide, where the ultrafiltration/diafiltration (UF/DF) is carried out using an aqueous buffer solution containing one or more salts. Also disclosed herein are oligonucleotide-containing compositions obtained by these methods.