Mixed Mode Resin for Extracellular Vesicle Purification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for purifying extracellular vesicles (EVs) are limited by their inability to effectively remove residual proteins and other molecules, are not scalable for high-throughput processing, and are not suitable for good manufacturing practice (GMP) large-scale production, making them unsuitable for therapeutic applications.
Innovation Solution
A method using a mixed mode resin composition comprising a first resin with size exclusion properties and a second resin with affinity ligands to trap and separate unbound molecules from EVs, allowing for high-purity EVs to be obtained in a concentrated form suitable for therapeutic and analytical applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If size exclusion chromatography is used to separate EVs from plasma proteins, then some proteins are removed, but residual proteins and undesirable molecules remain
Solution Approach 1:
The patent combines size exclusion chromatography with affinity-based capture in a single resin composition. The first resin provides size exclusion to separate EVs from small molecules, while the second resin provides affinity capture to specifically bind EVs. This merging of two purification mechanisms in one system achieves both removal of residual proteins and high purity EVs, resolving the contradiction between protein removal efficiency and substance loss.
2Ease of operation
If standard centrifugation methods are used for EV purification, then the process is simple, but the small size of EVs precludes effective separation
Solution Approach 1:
The patent uses a composite resin system combining two distinct resin types with different mechanisms. The first resin (size exclusion) and second resin (affinity-based) work together in a single composition to provide both ease of operation (single-step process) and high separation efficiency (specific binding to EVs). This composite approach maintains simplicity while achieving effective EV purification despite their small size.
3Productivity
If conventional EV purification methods are used, then processing is possible, but they are not scalable for high-throughput or GMP production
Solution Approach 1:
The resin composition is designed to be universally applicable across different scales and formats. The same mixed-mode resin can be used in various configurations (columns, plates, cartridges) to accommodate everything from research-scale to GMP manufacturing. The dual-mechanism design ensures that scalability does not compromise purification quality, maintaining both high throughput capability and high EV purity/concentration.
4Manufacturing precision
If EVs are purified using existing methods, then separation is achieved, but EVs are diluted and not maintained in native form
Solution Approach 1:
The affinity-based second resin specifically extracts and captures EVs from the complex biofluid matrix while the first resin removes small molecule contaminants. This selective extraction process concentrates EVs by removing surrounding proteins and molecules, achieving both high separation precision and high EV concentration in the final eluate, preventing dilution that occurs in conventional methods.
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 method achieves high-purity EVs with increased concentration and yield, enabling their use in high-throughput processing and GMP production, while maintaining EVs in their native form without dilution, enhancing their detection sensitivity for analytical purposes.
Implementation Method 1
a first resin having pores with a pore size that traps unbound molecules having a size less than or equal to 1,000,000 Da in its pores by at least by a size exclusion mechanism
Implementation Method 2
a second resin comprising at least one affinity ligand
Implementation Method 3
the second resin transiently and reversibly binds to the EV in a calcium-dependent manner
Data Source
AI summary
Disclosed is a method of purifying extracellular vesicles in a sample comprising extracellular vesicles and molecules that are not bound to the extracellular vesicles. The method includes (a) providing a mixed mode resin composition containing a first resin having pores with a pore size that traps unbound molecules by at least by a size exclusion mechanism, and a second resin containing at least one affinity ligand; (b) contacting the sample with the mixed mode resin composition to trap at least a portion of the unbound molecules; and (c) separating the sample from the mixed mode resin composition and obtaining a sample containing extracellular vesicles at a higher concentration than prior to step (b). Further disclosed is a method of labeling an extracellular vesicle with a fluorophore that labels proteins which includes the use of a mixed mode resin composition.