Multilayers of hydrogels loaded with microparticles: a fast and simple approach for microarray manufacturing

Area of Science:

• Biotechnology
• Materials Science
• Analytical Chemistry

Background:

• Multiplexed detection of biological interactions is crucial for diagnostics.
• Existing microarray fabrication methods can be complex and require specialized instrumentation.
• There is a need for simple, rapid, and flexible approaches to create biomolecule arrays.

Purpose of the Study:

• To present a novel and simple approach for creating arrays of biomolecules.
• To demonstrate the utility of these arrays for multiplexed detection of biological interactions.
• To establish the sensitivity and feasibility of the developed array system.

Main Methods:

• Fabrication of microarrays by cutting stacked layers of biofunctionalized polystyrene particle layers embedded in a permeable agarose matrix.
• Construction of three-dimensional particle/hydrogel constructs via consecutive dipping steps in a pre-gel solution.
• Proof-of-concept binding assays using rabbit and mouse IgG detection with fluorescence microscopy.

Main Results:

• Achieved rapid manufacturing of numerous array copies in a flexible manner without specialized instrumentation.
• Demonstrated low picomolar detection limits in sandwich assays for IgG.
• Detected 1 IgG out of 50,000 background proteins in reverse phase assays.
• Attained sensitivities comparable to standard fluorescence-based assays without assay optimization.

Conclusions:

• The developed particle/hydrogel array strategy offers a simple, rapid, and flexible method for fabricating biomolecule arrays.
• The arrays exhibit high sensitivity for detecting specific biomolecules, suitable for diagnostic applications.
• This approach eliminates the need for specialized equipment, making it accessible for broader research and development.