Exosome Capture via Magnetic Nanoparticle Segmentation
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Solution Overview
Problem
Conventional methods for capturing exosomes can only recognize two kinds of proteins per exosome, making it difficult to simultaneously identify three proteins and complicating the disease detection process, which affects the accuracy and precision of diagnoses.
Innovation Solution
A method involving the use of nanoparticles with magnetic substances and binding substances to form complexes with exosomes, allowing for the simultaneous identification of three detection target proteins by magnetic collection and subsequent binding to a substrate, enhancing disease specificity and diagnostic precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used to capture exosomes, then the process is simple, but only two kinds of proteins per exosome can be recognized
Solution Approach 1:
The capture process is divided into sequential steps: first capture using anti-CD63 antibodies, then second capture using anti-CD9 antibodies. This segmentation allows identification of multiple proteins (CD63 and CD9) while maintaining a systematic and manageable process flow, resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The invention introduces a dual-dimension capture system: first capture dimension using anti-CD63 antibodies, and second capture dimension using anti-CD9 antibodies. This two-dimensional approach enables simultaneous identification of multiple proteins on the same exosome population, enhancing measurement precision without overwhelming complexity.
2Measurement precision
If multiple captures are performed to identify three proteins, then detection accuracy improves, but the process becomes complicated
Solution Approach 1:
The invention merges the identification of CD63 and CD9 proteins into a single integrated capture process. By performing first capture with anti-CD63 antibodies followed by second capture with anti-CD9 antibodies in sequence, the system achieves three-protein identification (including exosome marker proteins) without requiring separate independent capture operations, thus improving ease of operation while maintaining detection accuracy.
Solution Approach 2:
The first capture step using anti-CD63 antibodies is performed as a preliminary action before the second capture. This preliminary enrichment and selection of exosomes expressing CD63 simplifies the subsequent second capture step, making the overall multi-protein detection process more operationally simple while achieving high detection accuracy.
3Loss of information
If conventional capture methods are used, then the process is straightforward, but it is difficult to recognize whether three proteins are present simultaneously on one exosome
Solution Approach 1:
The invention employs a two-dimensional capture strategy where exosomes are first captured based on CD63 expression, then subjected to second capture based on CD9 expression. This dimensional approach preserves and reveals co-expression information of multiple proteins on the same exosome population, preventing information loss about protein combinations while avoiding excessive system complexity through systematic design.
Solution Approach 2:
The invention creates a replicated detection system where the capture process is performed twice: first for CD63 identification, then for CD9 identification. This copying approach allows comprehensive detection of protein co-expression patterns without requiring a single overly complex system, as each capture step is relatively simple but together they provide complete information.
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 enables the simultaneous detection of three proteins on a single exosome, improving the accuracy and specificity of disease diagnosis by simplifying the process and reducing the need for multiple analyses.
Implementation Method 1
isolating the first complexes (5) from a mixed solution (4) of the first sample solution (1) and the first buffer solution (2), by bringing a magnet (6) close to a side surface (3a) of the container (3) to magnetically collect the first complexes (5) on the side surface (3a) around the magnet (6)
Implementation Method 2
mixing the first sample solution (1) with the first buffer solution (2) in the container (3) so as to bind the first detection target substances (12) and the first binding substances (22) together to form first complexes (5) of the exosomes (10) and the first nanoparticles (20)
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3(a)~3(b)
AI summary
A first sample solution including exosomes including first to third detection target substances is mixed with a first buffer solution including first nanoparticles including first binding substances which bind to the first detection target substances . The first detection target substances and the first binding substances are bound together, so as to form first complexes of the exosomes and the first nanoparticles . The first complexes are isolated from a mixed solution of the first sample solution and the first buffer solution, and second binding substances which bind to the second detection target substances are fixed onto a substrate. The second detection target substances and the second binding substances are bound together, so as to capture the first complexes on the substrate. A second buffer solution including second nanoparticles including third binding substances which bind to the third detection target substances is reacted with the first complexes. The third detection target substances and the third binding substances are bound together, so as to capture, on the substrate, second complexes in which the first and second nanoparticles bind to the exosomes.