Microfluidic Chip Isolating Extracellular Vesicles via Aqueous Two-Phase Systems
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Solution Overview
Problem
Existing methods for isolating extracellular vesicles are inefficient, requiring large sample volumes, expensive equipment, and are often labor-intensive or unsuitable for small samples.
Innovation Solution
A microfluidic channel-based method using a three-channel microfluidic chip with aqueous single-phase or two-phase systems to efficiently isolate extracellular vesicles by forming multi-phase microfluids and selectively recovering the fluid from the outlet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods (ultracentrifugation, size exclusion chromatography, polymer precipitation) are used to isolate extracellular vesicles, then isolation can be achieved, but large sample volumes and expensive equipment are required
Solution Approach 1:
The patent replaces conventional mechanical isolation methods (ultracentrifugation, chromatography) with a microfluidic-based aqueous two-phase system. The microfluidic chip creates controlled flow environments where extracellular vesicles are separated based on their partitioning behavior between PEG and dextran phases, eliminating the need for expensive ultracentrifugation equipment and large sample volumes while maintaining high isolation effectiveness
Solution Approach 2:
The patent changes the isolation parameters by using micro-scale fluid dynamics and phase partitioning coefficients instead of macro-scale centrifugal forces or chromatographic retention times. By adjusting PEG concentration (2-10%), dextran concentration (2-10%), and flow rates in the microfluidic channels, the system achieves effective separation with minimal sample volume (as low as 10-50 μL)
Solution Approach 3:
The patent transitions from conventional bulk-phase isolation to microfluidic channel-based isolation, utilizing the third dimension of controlled flow paths and vertical phase separation within narrow channels. The multi-channel microfluidic chip creates parallel separation paths that increase efficiency while reducing the total sample volume required
2Reliability
If conventional methods are used, then isolation can be performed, but the processes are labor-intensive and time-consuming
Solution Approach 1:
The microfluidic system enables continuous flow-based separation where samples are constantly processed through the chip without interruption. The aqueous two-phase system maintains continuous phase separation within the microchannels, allowing for uninterrupted isolation processes that complete in minutes rather than the hours required by conventional batch methods like ultracentrifugation or chromatography
Solution Approach 2:
The isolation process is segmented into distinct microfluidic channels, each performing a specific function (sample injection, phase separation, collection). This segmentation allows parallel processing and eliminates the sequential, labor-intensive steps of conventional methods, significantly reducing both time and manual intervention requirements
3Reliability
If aqueous two-phase systems are used with conventional methods, then separation can be achieved, but large sample volumes (at least 200 μl) are required
Solution Approach 1:
The patent transitions from bulk-phase aqueous two-phase separation to microfluidic channel-based separation, utilizing the third dimension of controlled flow paths and vertical phase separation within narrow channels. The multi-channel microfluidic chip creates parallel separation paths that increase efficiency while reducing the total sample volume required to at least 10-50 μL
Solution Approach 2:
The patent uses microfluidic hydraulic control to manipulate the aqueous two-phase system within confined channels. By controlling fluid pressure and flow rates through the microchannels, the system achieves enhanced phase separation efficiency with minimal sample volume, as the confined geometry amplifies the separation effects that would require large volumes in conventional bulk systems
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 yield and purity of extracellular vesicles using a small sample volume, significantly improving upon conventional methods which often result in low yields of 5-20%.
Implementation Method 1
aqueous two-phase systems (ATPS) referred as to a layer separation system in which two or more polymers or a polymer and a salt are both dispersed or dissolved in water, but are not mixed with each other when dispersing or dissolving in water due to their poor compatibilities with each other
Data Source
AI summary
The present invention relates to a method for isolating extracellular vesicles comprising: preparing a microfluidic chip in which at least two microfluidic channels are formed and inlets and outlets are formed at both ends of the channels, respectively; injecting at least one aqueous solution into the inlet of the microfluidic chip to form a microfluid; injecting a sample containing extracellular vesicles into the inlet of the microfluidic chip; and recovering the fluid from the outlet of the microfluidic chip.