NanoDLD Array for Single-Particle Exosome Detection
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Solution Overview
Problem
Existing antibody-based detection and separation methods face challenges in high sensitivity for small particles, large sample volume consumption, and inability to determine specific protein markers in subpopulations, particularly for particles like exosomes, due to reliance on bulk assays and lack of single-particle information.
Innovation Solution
A nanoscale deterministic lateral displacement (nanoDLD) array on a microfluidic chip is used for size-based separation and detection of target particles, employing a detector molecule that changes mode from zig-zag to bump based on binding, allowing for high-sensitivity single-particle detection and low-volume processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If antibody-based detection methods are used, then specific epitope recognition is achieved, but sample volume consumption is large and single-particle information cannot be obtained
Solution Approach 1:
The invention segments the detection process into two distinct stages: (1) bulk enrichment stage using antibody-based methods to concentrate target particles from large sample volumes, and (2) single-particle analysis stage using nanoDLD to provide high-resolution size measurements. This segmentation allows each method to operate in its optimal regime, resolving the contradiction between specific recognition and sample volume consumption.
Solution Approach 2:
The invention introduces an intermediary enrichment step that bridges bulk antibody-based detection and single-particle nanoDLD analysis. Antibodies serve as mediators to capture and concentrate rare target particles (such as exosomes) from large sample volumes into a smaller, analyzable volume, enabling subsequent high-precision single-particle measurements without requiring direct analysis of the entire original sample.
2Productivity
If bulk assays are used for detection, then large sample volumes can be processed, but single-particle information and specific protein marker determination are lost
Solution Approach 1:
The detection workflow is segmented into bulk processing and single-particle analysis phases. The bulk enrichment phase maintains high productivity by processing large sample volumes through antibody-based capture, while the subsequent single-particle nanoDLD phase recovers lost information by providing detailed size measurements of individual particles, eliminating the information loss inherent in bulk assays.
Solution Approach 2:
The invention applies preliminary action by performing bulk enrichment and concentration of target particles before single-particle analysis. This preliminary step preserves and concentrates the target particles from large volumes, ensuring that sufficient material is available for subsequent high-resolution single-particle measurements without losing individual particle information.
3Manufacturing precision
If traditional separation methods are used, then particle separation is achieved, but processing time is long and throughput is limited
Solution Approach 1:
The invention replaces traditional mechanical separation methods (such as centrifugation or filtration) with a hydrodynamic-based nanoDLD system. The nanoDLD array uses deterministic lateral displacement of particles in a flowing stream, eliminating the need for mechanical rotation or complex mechanical components, thereby reducing processing time while maintaining high separation precision for particles as small as 20 nanometers.
Solution Approach 2:
The invention employs hydraulic principles by using fluid flow through the nanoDLD array to achieve particle separation. The continuous flow of fluid carries particles through the pillar array, where size-based lateral displacement occurs hydrodynamically, enabling rapid separation without mechanical moving parts and significantly reducing processing time compared to traditional mechanical separation methods.
4Measurement precision
If high sensitivity detection for small particles is pursued, then detection limit is improved, but device complexity and processing time increase
Solution Approach 1:
The invention achieves high sensitivity detection of small particles (20 nm exosomes) by optimizing key parameters of the nanoDLD system: pillar spacing (2.5-10 micrometers), pillar diameter (0.5-5 micrometers), and flow rate (0.1-10 microliters per minute). These parameter optimizations enable high-resolution size-based detection of small particles without requiring complex device architectures or lengthy processing times.
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 approach enables high-sensitivity, high-throughput detection and separation of particles as small as 20 nanometers, reducing reagent consumption and enabling continuous flow, facilitating automation and compact architecture for efficient target particle purification and analysis.
Implementation Method 1
a nanoscale deterministic lateral displacement (nanoDLD) array... The nanoDLD array may comprise a plurality of pillars arranged in a plurality of columns... separating particles from a purified fluidic sample based on size
Data Source
AI summary
An apparatus is provided. The apparatus may comprise a layer of a microfluidic chip. The layer may comprise a nanoscale deterministic lateral displacement (nanoDLD) array. The nanoDLD array may comprise a plurality of pillars arranged in a plurality of columns. Further, the nanoDLD array may separate particles from a purified fluidic sample associated with a bodily materials of an organism.A method for purifying at least one target particle from a sample by utilizing a sized-based separation is provided. The method may include detecting the at least one target particle associated with the sample, by utilizing at least one detector molecule in a nanoDLD array. The method may then include separating the detected at least one target particle and the at least one detector molecule from a bump fraction in the sample based on a size of the detected at least one target particle.