Silicon Nanomembrane EV Isolation
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Solution Overview
Problem
Current methods for isolating extracellular vesicles (EVs) from biofluids are inefficient, costly, and fail to preserve EV integrity and bioactivity, particularly due to the complexity of biofluid matrices which often result in incomplete separation and loss of EVs during processing.
Innovation Solution
The use of silicon nanomembranes as filters for EV isolation, employing a two-step process involving pre-filtration to remove unwanted matrix species and capture membranes to retain EVs, allowing for efficient recovery and purification of EVs while maintaining their integrity and bioactivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional isolation methods are used to separate EVs from biofluids, then EVs can be obtained, but EV integrity and bioactivity are lost due to entrapment and denaturation
Solution Approach 1:
The patent employs nanomembranes with precisely controlled pore sizes (30-200 nm) that allow EVs to pass through while retaining larger matrix species. The porous structure enables size-based separation without the harsh conditions that cause EV denaturation, thus maintaining EV integrity and bioactivity while achieving effective isolation.
Solution Approach 2:
The isolation process is divided into two sequential filtration steps: first a pre-filtration membrane removes large matrix species, then a capture membrane with smaller pore size isolates EVs. This segmented approach prevents EV entrapment in large aggregates while maintaining bioactivity, solving the contradiction between reliable isolation and process simplicity.
2Productivity
If conventional filtration methods are used, then matrix species can be removed, but EVs are lost during processing due to incomplete separation
Solution Approach 1:
The patent changes the critical parameter of pore size to optimize EV recovery. By using nanomembranes with pore sizes matched to EV dimensions (30-200 nm), the system achieves high EV isolation efficiency while minimizing EV loss. The precise control of pore size parameters enables selective passage of EVs while retaining larger contaminants.
Solution Approach 2:
The nanomembrane filtration system provides high productivity through rapid size-based separation. The porous structure allows efficient passage of EVs while blocking larger matrix species, achieving both high isolation efficiency and minimal EV loss in a single integrated process.
3Ease of operation
If standard filtration membranes are used, then filtering can be performed, but EVs become trapped and denatured
Solution Approach 1:
The nanomembranes provide ease of operation through simple filtration while maintaining EV integrity. The porous structure with appropriate pore size allows EVs to pass through freely without entrapment, eliminating the denaturation problem associated with conventional filtration membranes while keeping the operation simple and straightforward.
4Loss of time
If rapid isolation methods are used, then processing time is reduced, but EV purity is compromised due to incomplete matrix species removal
Solution Approach 1:
The segmented two-step filtration process achieves both rapid processing and high purity. The pre-filtration membrane quickly removes large matrix species, and the capture membrane with nanoscale pores provides precise EV isolation. This segmentation enables rapid yet pure EV separation without compromising either processing time or separation purity.
Solution Approach 2:
The nanomembrane filtration system achieves rapid isolation with high purity through size-based separation. The porous structure enables quick passage of EVs while blocking contaminants, providing both speed and precision in EV isolation without requiring multiple lengthy processing steps.
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 effectively isolates EVs with high efficiency, reducing the risk of entrapment and denaturation, and allows for further analysis or therapeutic applications, improving the accuracy of EV-based diagnostics and therapeutics.
Implementation Method 1
filtering the biofluid sample using at least one nanomembrane
Data Source
AI summary
Provided are methods, devices, and kits for the isolation of extracellular vesicles using silicon nanomembranes. A method for EV isolation includes the steps of collecting a biofluid sample, contacting the biofluid sample with a pre-filtration membrane, thereby forming a first filtrate and a first retentate, optionally, washing the first retentate of the pre-filtration membrane, contacting the first filtrate from the pre-filtration membrane with a capture membrane, thereby forming a second filtrate and a second retentate, optionally, washing the second retentate, and eluting the second retentate from the capture membrane or lysing the second retentate to recover the contents.