Methods for affinity-based non-antibody capture and purification of extracellular vesicles

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Solution Overview

Problem

Current methods for isolating extracellular vesicles (EVs) from biofluids, such as ultracentrifugation and other techniques, are time-consuming, costly, low-throughput, and suffer from low recovery yields and high contamination, making them unsuitable for clinical applications and proteome or phosphoproteome analysis.

Innovation Solution

A novel method, EVTRAP, uses beads modified with hydrophilic and aromatic lipophilic groups to capture EVs, achieving >90% recovery yields and reducing contamination, suitable for various biofluids including urine, saliva, and plasma.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If ultracentrifugation is used for EV isolation, then EV purification is achieved, but the process is time-consuming (6-22 hours) and requires expensive equipment

Engineering Contradiction:

ImproveEV purificationVSAvoidisolation time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent replaces the mechanical ultracentrifugation system with a magnetic field-based capture system. Magnetic beads functionalized with lipids or lipid-like molecules are used to selectively bind EVs through magnetic attraction, eliminating the need for expensive ultracentrifuge equipment and reducing isolation time from 6-22 hours to approximately 1 hour or less.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the separation parameter from centrifugal force (requiring high g-force) to magnetic force. By functionalizing beads with lipid components that have affinity for EVs, the system achieves EV capture through magnetic field interaction, fundamentally changing the physical parameter used for separation and enabling faster, more accessible isolation.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If ultracentrifugation is used for EV isolation, then EV purification is achieved, but the recovery rate is low (5-25%)

Engineering Contradiction:

ImproveEV purificationVSAvoidEV recovery rate

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The patent introduces magnetic beads functionalized with lipids or lipid-like molecules as an intermediary capture medium. These beads have high affinity for EVs through lipid-lipid interactions, acting as a mediator that selectively binds EVs from biofluids. This intermediary system achieves significantly higher recovery rates ( >70%) compared to direct ultracentrifugation by improving the interaction efficiency between EVs and the capture system.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If polymer-based precipitation is used for EV isolation, then isolation speed is improved, but specificity is low and contamination with non-EV proteins occurs

Engineering Contradiction:

Improveisolation speedVSAvoidspecificity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies local quality by functionalizing magnetic beads with specific lipid or lipid-like molecules that have selective affinity for EVs. Different regions of the bead surface are designed with specific binding functionalities (lipids, lipid-like molecules, or antibodies against EV surface proteins) to selectively capture EVs while excluding non-EV proteins. This localized functional design achieves both high speed and high specificity, eliminating the contamination problem of polymer-based methods.

Inventive Principle:

Principle #3Local quality

4Reliability

If antibody-based affinity capture is used for EV isolation, then specificity is improved, but the method is constrained to small volumes and results in very low overall recovery yield

Engineering Contradiction:

ImprovespecificityVSAvoidrecovery yield

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent makes the magnetic bead system universal by functionalizing beads with multiple types of EV-targeting moieties (lipids, lipid-like molecules, or antibodies against EV surface proteins). This multi-functional approach allows the same bead system to capture various types of EVs from different biofluids, achieving both high specificity and high recovery yield across different applications, overcoming the volume and yield limitations of conventional antibody-based methods.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

EVTRAP enables efficient and reproducible capture of EVs, allowing for the detection of thousands of unique peptides and proteins in a single LC-MS run, with minimal contamination and improved recovery of EV markers compared to existing methods.

Implementation Method 1

beads modified with hydrophilic and aromatic lipophilic groups to capture EVs

Methodology Applied

Scientific EffectLipid affinity: Absorption (physical)

Implementation Method 2

beads modified with hydrophilic and aromatic lipophilic groups

Methodology Applied

Scientific EffectHydrophilic interaction: Hydrophile

Data Source

PatentUS20250244214A1Methods for affinity-based non-antibody capture and purification of extracellular vesicles

Publication Date: 2025.07.31 TYMORA ANALYTICAL OPERATIONS LLC

AI summary

A method is disclosed to capture and purify extracellular vesicles from biofluids via lipid affinity-based capture. The EVTRAP (Extracellular Vesicles Total Recovery And Purification) method enables capture of EVs onto modified beads. The EVTRAP method results in fast and reproducible capture and isolation of EVs with greater than 90% recovery yields.