Microfluidic Exosome Isolation via Dual Vacuum Filtration
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Solution Overview
Problem
Current methods for isolating exosomes from liquid samples are hindered by low recovery rates, low purity, poor integrity of isolated exosomes, poor reproducibility, potential introduction of unwanted impurities, high time consumption, and high costs.
Innovation Solution
The development of an isolation device and method that utilizes an isolation chip with filtration membranes and a vacuum system to efficiently isolate exosomes from large volume biological samples, achieving high throughput, automatic processing, and standardized operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultracentrifugation is used for exosome purification, then exosomes can be isolated from liquid samples, but the recovery rate is low (5% to 25%) and the process is time-consuming (greater than 4 hours)
Solution Approach 1:
The patent replaces the ultracentrifugation mechanical system with a microfluidic chip-based system that uses controlled flow and filtration. The microfluidic device processes samples through channels with specific pore sizes to separate exosomes, eliminating the need for high-speed centrifugation and significantly reducing isolation time while improving recovery rate
Solution Approach 2:
The patent employs porous filtration membranes with controlled pore sizes (30-150 nm) within the microfluidic chip to selectively capture exosomes. This porous material approach enables efficient size-based separation, achieving high recovery rates without the time-consuming centrifugation process
2Reliability
If immune capture method is used, then exosome purity can be improved, but the operation process becomes cumbersome and standardization is difficult
Solution Approach 1:
The patent extracts the antibody-dependent immune capture step and replaces it with a purely physical filtration mechanism based on size exclusion. The microfluidic chip uses precisely engineered pore sizes to separate exosomes from other particles, eliminating the need for antibodies and complex immunological reagents while maintaining high purity
Solution Approach 2:
The patent changes the separation parameter from biochemical specificity (antibody-antigen interaction) to physical dimension (particle size). By controlling the pore size of filtration membranes in the microfluidic device, the system achieves consistent purification without requiring complex immune capture protocols, enabling easy standardization
3Reliability
If conventional isolation methods are used, then exosomes can be isolated, but the integrity of isolated exosomes is poor and unwanted impurities may be introduced
Solution Approach 1:
The patent uses porous filtration membranes with precisely controlled pore sizes (30-150 nm) that match the size range of exosomes. This allows exosomes to pass through while retaining larger particles and impurities, or captures them depending on the configuration, thereby maintaining exosome integrity and preventing contamination without requiring harsh chemical treatments
Solution Approach 2:
The patent introduces a physical filtration barrier (porous membrane) as an intermediary between the sample and the collected exosomes. This intermediary selectively permits or blocks particles based on size, protecting exosome integrity and preventing impurity introduction without requiring direct chemical interactions that could damage the exosomes
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
The solution enables high-yield and high-purity exosome isolation in a cost-effective and stable manner, suitable for various biological samples, with improved reproducibility and reduced operational complexity.
Implementation Method 1
a vacuum system alternately generates a negative pressure in chambers on both sides of the sample reservoir
Implementation Method 2
isolation chip with filtration membranes
Data Source
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AI summary
An isolation device for isolation of target particles from a plurality of liquid samples includes a plurality of isolation chips and a vacuum system. Each of the plurality of isolation chips includes a sample reservoir, and a first outlet and a second outlet disposed at opposite sides of the sample reservoir. The vacuum system includes a first vacuum pump connected to the first outlet of each of the plurality of isolation chips and a second vacuum pump connected to the second outlet of each of the plurality of isolation chips. The first vacuum pump generates a negative pressure in each of the plurality of isolation chips through a corresponding first outlet. The second vacuum pump generates a negative pressure in each of the plurality of isolation chips through a corresponding second outlet. The target particles are isolated from each of the plurality of liquid samples in a corresponding sample reservoir. The present disclosure further provides a method for isolation of target particles from a plurality of liquid samples using the isolation device.