Controlled fabrication of multi-core alginate microcapsules

Area of Science:

• Biomaterials Engineering
• Microfluidics
• Encapsulation Technology

Background:

• Alginate microcapsules are crucial for various applications, including drug delivery and cell encapsulation.
• Existing methods for generating microcapsules with liquid cores often face challenges in control, stability, and process continuity.

Purpose of the Study:

• To develop a robust microfluidic platform for controlled and complete on-chip generation of alginate microcapsules.
• To create microcapsules with single and double liquid cores using a hybrid glass-polydimethylsiloxane (PDMS) device.
• To ensure stability and integrity of the liquid cores within the alginate microcapsules.

Main Methods:

• A hybrid glass-PDMS device integrating coflow and T-junction configurations was employed.
• Oil was used as the liquid core material for microcapsule generation.
• Frequency matching between oil-alginate double emulsion and calcium chloride droplet generation was utilized for controlled merging.

Main Results:

• The microfluidic platform successfully generated alginate microcapsules with single and double liquid cores.
• Confocal imaging confirmed the presence of intact liquid cores within the microcapsules.
• Double-core microcapsules exhibited well-separated cores, indicating long-term stability due to the alginate layer.

Conclusions:

• The developed microfluidic platform offers a reliable method for producing stable alginate microcapsules with liquid cores.
• This approach demonstrates advantages in process continuity, core stability control, and potential for non-damaging cell encapsulation.
• The technology is poised to advance applications requiring precise microcapsule fabrication.