Continuous Spin Freeze-Drying Nucleic Acid Stability
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Solution Overview
Problem
Traditional batch freeze-drying methods are time- and energy-consuming, leading to uncontrolled freezing and uneven heat transfer, which results in variability in the quality of nucleic acid containing compositions.
Innovation Solution
The method involves continuous spin freezing and drying of nucleic acid containing compositions, where vials are rapidly rotated and cooled to form a uniform layer, followed by drying using a heating source with homogenous heat transfer, allowing for flexible cryoprotectant concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional batch freeze-drying is used, then large numbers of vials can be processed in one step, but the process is time-consuming and energy-consuming with uncontrolled freezing and uneven heat transfer
Solution Approach 1:
The patent implements continuous spin-freeze-drying where vials are continuously rotated and processed through freezing and drying zones, eliminating the batch processing interruptions. The continuous rotation ensures constant exposure to controlled freezing conditions and uniform heat transfer during drying, maintaining high productivity while reducing total processing time compared to traditional batch methods.
Solution Approach 2:
The patent introduces dynamic rotation of vials during the freeze-drying process. The continuous spinning motion dynamically distributes the formulation uniformly across the vial inner surface, ensures even heat transfer from all directions, and prevents localized overheating or under-freezing, thereby improving both processing efficiency and product quality consistency.
2Ease of manufacture
If traditional batch freeze-drying is used, then processing can be done in discrete steps, but uncontrolled freezing and uneven heat transfer lead to vial-to-vial and batch-to-batch variability
Solution Approach 1:
The patent controls and standardizes critical process parameters including rotation speed, temperature profiles in different zones, and residence time in freezing and drying sections. By precisely controlling these parameters in the continuous process, the invention achieves uniform freezing and drying conditions across all vials, eliminating the variability inherent in traditional batch methods while maintaining manufacturing feasibility.
Solution Approach 2:
The continuous spin-freeze-drying system incorporates monitoring and control mechanisms that track process parameters such as temperature, rotation speed, and product characteristics in real-time. This feedback enables continuous adjustment to maintain optimal conditions, ensuring consistent quality across all vials processed in the continuous stream.
3Stability of the object's composition
If higher concentrations of cryoprotectant are used, then stability of nucleic acid compositions is enhanced, but cake quality is compromised in classical freeze-drying methods
Solution Approach 1:
The continuous rotation during spin-freeze-drying dynamically distributes high concentrations of cryoprotectant uniformly throughout the formulation layer on the vial inner surface. This dynamic mixing and distribution prevents localized crystallization or uneven concentration gradients that would otherwise compromise cake quality, enabling the use of higher cryoprotectant concentrations for enhanced nucleic acid stability without sacrificing product quality.
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 significantly reduces variability in critical quality attributes, enhances the stability of nucleic acid containing compositions, and allows for higher concentrations of cryoprotectants without compromising cake quality.
Implementation Method 1
c) while continuing spinning said container of step b), cooling said container to freeze-dry said formulation at the circumferential inner wall
Implementation Method 2
d) drying said spin-frozen container of step c) by subjecting said container to a heating source which provides a homogenous heat transfer to the circumferential inner wall of the container
Implementation Method 3
a primary drying step wherein ice crystals are removed under vacuum by sublimation
Implementation Method 4
a secondary drying step wherein most of the unfrozen water is removed by diffusion and desorption
Data Source
AI summary
The present invention relates to the field of freeze-drying compositions, in particular nucleic acid containing compositions. More specifically, the present invention relates to freeze-dry nucleic acid containing compositions using a method of continuous spin freezing and continuous spin drying (sublimation and desorption) the composition. The invention further relates to a nucleic acid containing composition by making use of the method according to the invention.