LEAPS Particle Arrays for Multiplexed Bioassay Fabrication
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Solution Overview
Problem
Current methods for fabricating multiplexed bioassays face challenges in reproducibly producing customized arrays with controlled microfluidics and photochemical manipulations, leading to issues with molecular configuration and accessibility of binding agents, as well as complex quality control and implementation problems.
Innovation Solution
The use of particle arrays, specifically encoded beads, which are functionized and assembled on a substrate using Light-controlled Electrokinetic Assembly of Particles near Surfaces (LEAPS), allowing for automated, on-demand fabrication of planar arrays with flexible and reliable customization, independent quality control, and chip-independent characterization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If microfluidic spotting is used to produce deposited features of 100 μm diameter, then spatial encoding and multiplexing capability are improved, but manufacturing precision deteriorates due to inability to dispense nanoliter aliquots with tight volume control
Solution Approach 1:
The patent replaces mechanical microfluidic dispensing systems with a photolithography-based approach. Instead of mechanically dispensing nanoliter aliquots, the invention uses photolithography to define spatial patterns on a substrate, eliminating the need for precise mechanical volume control while maintaining spatial encoding capability.
Solution Approach 2:
The patent creates a copy of the desired spatial pattern through photolithography. Rather than physically dispensing material at precise locations, the invention uses light to transfer a patterned mask onto the substrate, achieving the same spatial encoding effect with improved precision and controllability.
2Ease of manufacture
If binding agents are exposed to air during deposition, then deposition process simplicity is improved, but reliability deteriorates due to uncontrollable impact on molecular configuration and accessibility
Solution Approach 1:
The patent employs controlled environmental conditions during the deposition process. Instead of exposing binding agents to air, the invention conducts deposition under controlled atmospheric conditions that prevent unwanted molecular changes, thereby maintaining reliability while keeping the process simple.
Solution Approach 2:
The patent performs preliminary actions to protect binding agents from environmental degradation. By preparing and positioning binding agents before final deposition, and using protective measures during the process, the invention prevents molecular configuration changes without complicating the overall deposition procedure.
3Adaptability or versatility
If in-situ array synthesis is used, then customization flexibility is improved, but device complexity increases due to multiple masking and photochemical reaction steps that must be redesigned for each array composition
Solution Approach 1:
The patent creates a universal platform that can generate different array compositions using the same basic photolithography process. By designing a single versatile system that can accommodate various binding agents and array configurations, the invention achieves customization flexibility without increasing process complexity for each specific array type.
Solution Approach 2:
The patent segments the array synthesis process into distinct, modular steps. By dividing the complex in-situ synthesis into separate photolithography cycles and binding agent incorporation steps, the invention makes each step independently controllable and simplifies the overall process while maintaining customization capability.
4Measurement precision
If assay performance is assessed in-situ for each array, then immediate feedback is improved, but ease of operation deteriorates due to difficult quality control and implementation issues
Solution Approach 1:
The patent creates reference arrays or control arrays that serve as copies for quality assessment. Instead of assessing each custom array in-situ, the invention uses standardized reference arrays that can be independently manufactured and stored, providing a simple and reliable quality control mechanism that does not complicate the custom array production process.
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 rapid customization of DNA or protein arrays, minimizes spot-to-spot and chip-to-chip variability, and allows for concurrent processing of multiple samples, improving assay sensitivity and specificity while simplifying quality control and implementation.
Implementation Method 1
Light-controlled Electrokinetic Assembly of Particles near Surfaces (LEAPS)
Data Source
AI summary
The present invention provides methods and apparatus for the application of a particle array in bioassay format to perform qualitative and/or quantitative molecular interaction analysis between two classes of molecules (an analyte and a binding agent). The methods and apparatus disclosed herein permit the determination of the presence or absence of association, the strength of association, and/or the rate of association and dissociation governing the binding interactions between the binding agents and the analyte molecules. The present invention is especially useful for performing multiplexed (parallel) assays for qualitative and/or quantitative analysis of binding interactions of a number of analyte molecules in a sample.