Controlled generation of spiky microparticles by ionic cross-linking within an aqueous two-phase system

Area of Science:

• Biomaterials Science
• Chemical Engineering
• Drug Delivery Systems

Background:

• Non-spherical microparticles offer advantages in drug delivery due to their high surface-to-volume ratio for enhanced targeting and cellular attachment.
• Existing methods for generating non-spherical microparticles are often complex or require significant post-processing of natural materials like pollen grains.

Purpose of the Study:

• To develop a facile and controlled chemical synthesis method for generating non-spherical, pollen-like microparticles.
• To investigate the potential of these microparticles as advanced drug delivery vehicles.

Main Methods:

• Utilized ionic cross-linking of alginate with calcium chloride (CaCl2).
• Employed an aqueous two-phase system (ATPS) composed of dextran (DEX) and polyethylene glycol (PEG).
• Controlled the length of surface spikes on the generated microparticles.

Main Results:

• Successfully synthesized biocompatible, pollen-like microparticles with tunable spike lengths.
• The chemical synthesis approach is unique, facile, and avoids complicated setups or extensive post-processing.
• Demonstrated a novel method for generating biomaterials with controlled morphology.

Conclusions:

• The developed chemical synthesis provides a straightforward route to produce pollen-like microparticles.
• These microparticles show promise for applications in drug delivery, offering improved targeting and attachment.
• The methodology may be applicable to the synthesis of other advanced biomaterials.