Virus Separation Using Dual Cationic Adsorbents and pH Control
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Solution Overview
Problem
Current methods for separating viruses from biotechnological liquids often result in low virus yields and purity due to the adsorption of both viruses and contaminants using ion-exchange chromatography, leading to inefficient purification processes.
Innovation Solution
A method involving two anion exchangers with cationic groups, where the first is used in 'bind-and-elute' mode and the second in 'flow-through' mode, with the addition of multivalent anions to enhance the separation of viruses from contaminants, utilizing adsorption membranes for improved flow rates and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ion-exchange chromatography is used to separate viruses from contaminants, then both viruses and contaminants are adsorbed, but this results in low virus yields and purity
Solution Approach 1:
The purification process is divided into two distinct stages: first, selective adsorption of contaminants using a cationic adsorbent at pH 6.0-8.0, followed by selective adsorption of viruses using an anionic adsorbent at pH 3.0-5.0. This segmentation allows each stage to target specific components, preventing co-adsorption and improving both purity and yield
Solution Approach 2:
The method employs pH adjustment as a key parameter change to control adsorption selectivity. By adjusting pH to 6.0-8.0 for the first stage and 3.0-5.0 for the second stage, the electrostatic charges of viruses and contaminants are differentially modified, enabling selective binding to oppositely charged adsorbents and resolving the contradiction between purity and yield
2Manufacturing precision
If conventional adsorption methods are used, then viruses can be adsorbed, but process time is extended and costs increase
Solution Approach 1:
By optimizing pH parameters (6.0-8.0 for first stage, 3.0-5.0 for second stage) and using oppositely charged adsorbents, the method achieves rapid selective adsorption in two stages rather than requiring multiple conventional steps, reducing overall process time while maintaining high purity
Solution Approach 2:
The method allows contaminants to be discarded in the flow-through of the first adsorbent column, and viruses to be recovered from the flow-through of the second adsorbent column, eliminating time-consuming washing and elution steps required in conventional chromatography
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 increases virus yields and purity by selectively adsorbing contaminants while allowing viruses to pass through, reducing process time and costs, thereby overcoming the limitations of existing purification methods.
Implementation Method 1
the viruses are first adsorbed to a first adsorbent having cationic groups
Implementation Method 2
contacting the liquid medium with a first adsorbent containing cationic groups
Implementation Method 3
subsequently desorbed therefrom
Implementation Method 4
contacting a second adsorbent containing cationic groups with a liquid medium comprising the viruses from step C) and multivalent anions
Implementation Method 5
a method involving two anion exchangers with cationic groups
Implementation Method 6
utilizing adsorption membranes for improved flow rates and selectivity
Data Source
AI summary
The present invention relates to a method for separating viruses from a contaminant-containing liquid medium using two adsorbents having cationic groups, wherein the viruses are adsorbed to the first adsorbent and subsequently eluted and wherein the contaminants present in the resulting eluate are subsequently adsorbed to the second adsorbent. The yield and purity of the viruses obtained as per the method according to the invention is increased by the addition of multivalent anions during the adsorption of the contaminants to the second adsorbent.