Virus-Like Particle Purification via Calcium-Deoxycholate Precipitation
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Solution Overview
Problem
The existing methods for separating virus-like particles from host cells are costly due to the requirement of cesium chloride density gradient centrifugation and subsequent gel filtration chromatography steps.
Innovation Solution
A method that involves adding a desorption buffer containing deoxycholic acid and/or its soluble salts to release virus-like particles, followed by precipitation with a soluble calcium salt, allowing for their separation and purification without the need for cesium chloride density gradient centrifugation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cesium chloride density gradient centrifugation and gel filtration chromatography are used for purification, then high purity of virus-like particles is achieved, but production costs increase significantly
Solution Approach 1:
The invention extracts and utilizes the specific property of deoxycholic acid to selectively precipitate virus-like particles from the supernatant. By adding calcium chloride, the deoxycholic acid forms an insoluble calcium salt that precipitates together with the virus-like particles, separating them from other cellular components. This extraction-based approach replaces the need for expensive cesium chloride density gradient centrifugation and gel filtration chromatography, achieving comparable purity at lower cost.
Solution Approach 2:
The invention changes the chemical parameter of the system by introducing deoxycholic acid and calcium ions. The addition of calcium chloride causes deoxycholic acid to form an insoluble calcium salt, changing the solubility parameter of the system. This parameter change enables selective precipitation of virus-like particles at a specific stage of the purification process, eliminating the need for subsequent expensive purification steps while maintaining high purity.
2Manufacturing precision
If multiple purification steps including ultracentrifugation and chromatography are performed, then virus-like particles are highly purified, but processing time and operational complexity increase
Solution Approach 1:
The invention merges the functions of multiple purification steps into a single precipitation operation. The addition of calcium chloride simultaneously achieves separation of virus-like particles from cellular debris, concentration, and purification in one step. This consolidates what would traditionally require multiple separate operations (ultracentrifugation, chromatography, etc.) into a single efficient step, reducing both operational complexity and processing time.
Solution Approach 2:
The invention introduces deoxycholic acid as an intermediary substance that mediates the separation process. The deoxycholic acid acts as a bridge between the virus-like particles and the precipitating agent (calcium chloride). It selectively binds to the virus-like particles and forms an insoluble calcium salt, enabling their specific precipitation and separation from the supernatant without requiring complex equipment or multiple processing steps.
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 achieves comparable purity to traditional methods while eliminating the expensive steps of cesium chloride density gradient centrifugation and gel filtration chromatography, reducing overall costs.
Implementation Method 1
e) the virus-like particles are desorbed from the separated-off adsorbent, so that they pass into a supernatant of a second suspension formed thereby
Implementation Method 2
c) an adsorbent is added to the supernatant separated from the first suspension such that the virus-like particles are adsorbed by the adsorbent
Implementation Method 3
g) a soluble calcium salt is added to the separated-off supernatant, forming a precipitate containing a calcium salt of the deoxycholic acid and the virus-like particles
Data Source
AI summary
A method for separating virus-like particles from a cell suspension of host cells. The virus-like particles having at least one envelope protein embedded in a lipid double membrane including at least a portion corresponding to a small envelope protein of a virus of the family Hepadnaviridae. The host cells are disrupted to obtain a first suspension. A supernatant containing the virus-like particles is separated from the first suspension. Then, an adsorbent is added to the supernatant and separated off. Then, the virus-like particles are desorbed from the adsorbent by adding a desorption buffer. A soluble calcium salt is added to a supernatant separated from the second suspension to form a precipitate, the precipitate formed is separated off and transferred to a third suspension. The virus-like particles are separated from the third suspension and purified.