Stacked Centrifugal Filtration for Exosome Extraction
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Solution Overview
Problem
Current exosome extraction methods are time-consuming, inefficient, costly, and unsuitable for large-scale clinical applications, particularly for serum samples, as they require specialized equipment and are not capable of parallel processing.
Innovation Solution
A stacked centrifugal filtration device comprising a filter tube with a filter membrane, an ultrafiltration tube with an ultrafiltration membrane, and a collecting tube, using an incubation buffer and protease K to separate and extract exosomes through centrifugation, allowing for efficient and cost-effective processing of multiple samples simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ultracentrifugation is used for exosome extraction, then separation purity is improved, but operation time increases to 8-24 hours
Solution Approach 1:
The filtration process is divided into multiple stages with different pore size membranes (0.22 μm, 0.03 μm, and ultrafiltration membranes) arranged in sequence, where each membrane segment performs a specific filtration function to progressively separate exosomes from different size components, achieving high purity without requiring ultracentrifugation
Solution Approach 2:
The invention changes the separation parameter from centrifugal force (ultracentrifugation) to filtration based on pore size differences. By using membranes with specific pore sizes (0.22 μm, 0.03 μm, and ultrafiltration membranes), the system achieves separation based on physical filtration rather than density-based centrifugation, dramatically reducing operation time while maintaining purity
2Manufacturing precision
If ultracentrifugation is used for exosome extraction, then separation purity is improved, but recovery rate decreases to about 10%
Solution Approach 1:
The multi-stage filtration system with progressively smaller pore sizes (0.22 μm → 0.03 μm → ultrafiltration membranes) efficiently captures exosomes at each stage while allowing smaller contaminants to pass through, achieving both high purity and high recovery rate by preventing exosome loss that occurs in ultracentrifugation
Solution Approach 2:
The filtration system replicates the separation function of ultracentrifugation using a different physical mechanism (physical filtration through membranes with specific pore sizes rather than density-based centrifugation), achieving equivalent or superior separation performance with dramatically improved recovery rate
3Loss of time
If polymer precipitation method is used for exosome extraction, then operation time is reduced, but additional components are introduced that limit subsequent applications
Solution Approach 1:
The invention removes the polymer precipitation step entirely, using only physical filtration through membranes. This extracts the harmful additional components (polymers) from the process while retaining the essential separation function, enabling the exosomes to be used in subsequent applications without contamination
Solution Approach 2:
The invention uses disposable filtration membranes instead of reusable polymer reagents. The membranes are discarded after single use, eliminating the need for additional purification steps to remove polymer contaminants, thus maintaining exosome purity and compatibility for subsequent applications
4Manufacturing precision
If magnetic bead precipitation is used for exosome extraction, then specific exosome subgroups can be purified, but only certain subgroups presenting specific antigens can be captured
Solution Approach 1:
The filtration system with membranes of different pore sizes serves multiple functions: it separates exosomes from cells, debris, and smaller molecules simultaneously without requiring antigen-specific reagents. This universal approach captures all exosome subtypes regardless of surface antigen expression, while still allowing for specific subgroup purification if needed
5Manufacturing precision
If ultracentrifugation is used for exosome extraction, then exosome precipitation is achieved, but specialized ultracentrifuge equipment is required
Solution Approach 1:
The invention replaces the complex mechanical system of ultracentrifugation (requiring specialized ultracentrifuges) with a simpler mechanical filtration system using membranes and standard centrifuges or even gravity-based filtration. This substitution maintains the exosome precipitation/separation function while eliminating the need for specialized equipment
6Manufacturing precision
If ultracentrifugation is used for exosome extraction, then exosome collection is achieved, but parallel operation is limited to no more than 6 samples
Solution Approach 1:
The stacked filtration device consists of multiple independent filtration units (with membranes of different pore sizes) that can be connected in series. Each unit can process samples independently or in parallel, and multiple devices can be used simultaneously, enabling high-throughput processing of many samples at once without the parallel operation limitations of ultracentrifugation
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 method reduces operation time to 30 minutes, achieves equivalent purity to ultracentrifugation, is cost-effective, and enables parallel processing of up to 24 samples using standard laboratory equipment, making it suitable for large-scale clinical applications.
Implementation Method 1
exosome separation and extraction by stacked centrifugal filtration
Implementation Method 2
a filter tube comprising a filter membrane at the bottom... an ultrafiltration tube arranged outside of the filter tube, comprising an ultrafiltration membrane at the bottom
Data Source
AI summary
A method for exosome separation and extraction by stacked centrifugal filtration. It is used in molecular biology and clinical examination and comprises an exosome separation and extraction kit consisting of the stacked centrifugal filtration device, an incubation buffer and a protease K. The sample to be tested is incubated at room temperature using the incubation buffer and an appropriate amount of protease K, followed by centrifugation in a centrifuge matching the stacked centrifugal filtration device. After mixing thoroughly, the retained liquid in the ultrafiltration tube is collected to obtain the exosomes. The method needs no large experimental equipments except for a centrifuge, which has a low cost and which is convenient and fast, with short operation time and the possibility of carrying out parallel operations with a large number of samples. The high purity exosomes obtained by the method can meet the demand of large-scale clinical applications.