Virus Purification via Affinity Chromatography
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Solution Overview
Problem
Current methods for purifying viruses, such as flaviviruses, result in significant virus loss, high levels of host cell proteins and DNA, high sucrose levels, and aggregation of purified virus particles, making them inefficient and difficult to use in single-use technologies.
Innovation Solution
A novel virus purification process that captures and purifies viruses while separating them from host cell proteins and DNA, reducing sucrose levels, and preventing aggregation, using a combination of chromatographic steps, buffer exchanges, and adjuvants to produce a highly purified, stable virus formulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ultracentrifugation with sucrose gradient is used to purify virus, then virus separation from host cell proteins and DNA is achieved, but significant virus loss occurs and sucrose remains in final sample
Solution Approach 1:
The patent changes the physical-chemical parameters of the purification system by replacing sucrose gradient ultracentrifugation with chromatographic methods using affinity resins. This involves changing the separation mechanism from density-based to affinity-based, and using buffer exchange to remove residual sugars, thereby achieving high purification quality without significant virus loss
Solution Approach 2:
The patent replaces the mechanical ultracentrifugation system with a chromatographic system using affinity resins. This substitution eliminates the need for high-speed centrifugation and sucrose gradients, using instead specific binding interactions between the virus and resin, followed by elution and buffer exchange to achieve purification without virus loss
2Manufacturing precision
If TFF is used to separate virus from proteins and compounds, then sucrose-free virus sample is obtained, but significant virus loss occurs
Solution Approach 1:
The patent introduces affinity resins as intermediary materials that specifically bind to the virus. This intermediary mechanism allows for gentle capture and release of the virus through controlled binding and elution, avoiding the mechanical stress and adsorption losses associated with TFF while achieving sucrose-free purification
Solution Approach 2:
The patent replaces the mechanical filtration system (TFF) with a biochemical affinity-based system. The affinity resin provides specific binding sites for the virus, allowing separation from contaminants without the mechanical forces that cause virus loss in TFF, while buffer exchange removes residual sugars
3Manufacturing precision
If conventional purification methods are used, then virus is separated from host cell materials, but host cell protein levels remain higher than desirable
Solution Approach 1:
The patent uses affinity resins as intermediaries that specifically bind to viral particles while allowing host cell proteins and DNA to pass through. This selective binding mechanism achieves superior separation efficiency, reducing host cell protein levels to below detection limits while maintaining high virus recovery
Solution Approach 2:
The patent applies local quality by designing purification systems with specific affinity resins tailored to bind particular viral components. This localized specific binding at the molecular level enables selective capture of virus while excluding host cell contaminants, achieving high purity without significant virus loss
4Productivity
If conventional purification methods are used, then virus is concentrated, but aggregation or clumping of purified virus particles occurs
Solution Approach 1:
The patent applies preliminary action by performing buffer exchange and adding stabilizing agents during the concentration process. This preliminary stabilization prevents virus aggregation before final formulation, maintaining particle stability while achieving the desired concentration for vaccination
Solution Approach 2:
The patent changes the physical-chemical parameters during concentration by controlling buffer composition, pH, and ionic strength. These parameter adjustments prevent virus aggregation while enabling effective concentration, achieving both productivity and stability goals
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 process achieves high virus recovery rates, reduces host cell protein levels to below detection limits, minimizes sucrose presence, and prevents virus aggregation, resulting in a highly purified and stable virus product suitable for formulations and single-use technologies.
Implementation Method 1
The process also can be used to inactivate and/or concentrate the virus sufficiently for use in formulations
Implementation Method 2
The disclosed process utilizes adjuvants and buffer exchanges to process the virus
Data Source
AI summary
Disclosed herein is provided a virus purification and formulation process for purifying a flavivirus represented by one of a Yellow Fever Virus, Japanese Encephalitis virus, Dengue virus, and West Nile virus. The highly purified flavivirus virus product is characterized as having a low level of sucrose without significant virus loss such as that which is typically encountered by prior art virus purification processes. The disclosed process captures and purifies the virus, separating it from the host cell proteins and DNA, and leaving the host cell proteins and DNA behind. The process also can be used to inactivate and/or concentrate the virus sufficiently for use in formulations.