Formation of droplet or hydrogel arrays using hydrophilic-hydrophobic patterned surfaces for high-throughput screening applications
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Solution Overview
Problem
Current high-throughput cell screening methods are expensive and inaccessible due to the need for expensive liquid-handling devices and are limited in their ability to handle non-adherent cells, 3D microenvironments, and controlled diffusion of small molecules, leading to cross-contamination and high costs.
Innovation Solution
A method involving a patterned substrate with superhydrophilic and superhydrophobic areas is used to create arrays of separated aqueous fluid microdroplets or hydrogel patterns, allowing for the formation of high-density arrays of biological specimens without the need for expensive liquid-handling devices, by applying aqueous fluid to superhydrophilic areas on a substrate with superhydrophobic barriers, preventing cross-contamination and enabling controlled diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microplates with 96 or 384 wells are used for parallel cell experiments, then cross-contamination between neighboring spots is prevented, but the expense and device complexity increase significantly
Solution Approach 1:
The microarray system uses self-service mechanisms where the patterned substrate itself performs the function of liquid distribution and containment. The superhydrophobic/superhydrophilic patterned surface automatically directs aqueous fluids to specific regions without external liquid-handling devices, eliminating the need for expensive robotic systems while maintaining prevention of cross-contamination between spots.
Solution Approach 2:
The invention replaces complex mechanical liquid-handling systems with a surface chemistry-based solution. Instead of using mechanical pumps, valves, and robotic dispensers, the system uses the intrinsic wetting properties of patterned surfaces to control fluid behavior, substituting mechanical complexity with chemical surface engineering.
2Productivity
If conventional cell microarrays are used, then miniaturization is achieved, but they fail to support non-adherent cells and 3D microenvironments
Solution Approach 1:
The invention applies local quality by creating distinct regions with different surface properties on the same substrate. Superhydrophobic regions provide repulsive forces that prevent adhesion, while superhydrophilic regions provide attractive forces that support cell attachment. This spatial variation in surface properties allows the same platform to accommodate both adherent and non-adherent cells, as well as support 3D microenvironment formation.
Solution Approach 2:
The system changes the surface energy parameter of the substrate to create extreme hydrophobicity and hydrophilicity regions. By modifying surface chemistry parameters, the system enables versatile cell culture conditions without requiring different physical platforms, allowing miniaturized arrays to support diverse cell types and 3D structures.
3Productivity
If libraries containing thousands of nucleic acids, drug candidates, or proteins are screened using microplates, then comprehensive screening is achieved, but the cost becomes extremely expensive and unaffordable
Solution Approach 1:
The invention segments the screening platform into a miniaturized microarray format with thousands of individual reaction spots on a single chip. This segmentation replaces the need for hundreds of separate microplates, allowing comprehensive screening of thousands of compounds to be performed on a single substrate, dramatically reducing material consumption and cost while maintaining high productivity.
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 efficient, cost-effective high-density arrays of biological specimens, reducing cross-contamination and allowing for high-throughput screening of non-adherent cells and organisms, including those in 3D microenvironments, without the need for expensive equipment, facilitating the use of non-adherent cells and whole organisms in drug and gene function screenings.
Implementation Method 1
a porous polymer layer or film comprising superhydrophilic areas having the desired shape and size, surrounded by superhydrophobic areas separating the hydrophilic areas into the desired spatial pattern
Implementation Method 2
superhydrophobic areas separating the hydrophilic areas into the desired spatial pattern
Implementation Method 3
applying the aqueous fluid to a multitude of the superhydrophilic areas at the same time
Data Source
Figure 1a~1e
Figure 2a~2c
Figure 3a~3b
AI summary
The present invention relates to a method of forming an array of separated homogenous fluid microdroplets or hydrogel micropads of a desired shape and size in a desired spatial pattern, comprising the steps of providing a patterned substrate with a solid support coated with a porous polymer layer or film comprising hydrophilic areas having the desired shape and size, surrounded by hydrophobic areas separating the hydrophilic areas into the desired spatial pattern, and applying the fluid to a multitude of the hydrophilic areas at the same time.