Sphyga: a multiparameter open source tool for fabricating smart and tunable hydrogel microbeads

Area of Science:

• Biomaterials Engineering
• Microfluidics
• Biotechnology

Background:

• Hydrogel microbeads are crucial for encapsulating biological materials like cells and drugs.
• Existing fabrication methods often lack versatility in material choice and size control.

Purpose of the Study:

• To introduce the Spherical Hydrogel Generator (Sphyga), an open-source tool for fabricating highly reproducible hydrogel microbeads.
• To demonstrate Sphyga's capability to produce microbeads with controlled shapes and diameters (100-2000 µm) across various materials.

Main Methods:

• Utilized Sphyga, an open-source fabrication tool, to create hydrogel microbeads.
• Independently modulated fabrication parameters including needle size, air pressure, and material outflow.
• Varied alginate solution viscosity (influenced by pH and composition) to tune microbead architecture.
• Incorporated proteins, cells, dyes, and nanoparticles to create composite microbeads.

Main Results:

• Achieved highly reproducible hydrogel microbeads with predictable shapes and sizes.
• Established a multiparameter working window for tailored microbead fabrication.
• Demonstrated successful encapsulation of diverse biological components within the hydrogel matrix.
• Confirmed that solution viscosity is a key factor in engineering hydrogel microbead architecture.

Conclusions:

• Sphyga offers a versatile and accessible platform for generating custom hydrogel microbeads.
• The ability to tune material viscosity and fabrication parameters allows for the creation of complex microenvironments.
• Engineered hydrogel microbeads hold significant potential for advanced biomedical applications.