Characterization of modified alginate-poly-L-lysine microcapsules

Area of Science:

• Biomaterials Science
• Chemical Engineering
• Drug Delivery Systems

Background:

• Alginate-poly-L-lysine microcapsules are widely used in biomedical applications.
• Enhancing the mechanical stability and functional properties of these microcapsules is crucial for their efficacy.
• Previous modifications have focused on core composition and surface coatings.

Purpose of the Study:

• To investigate the effects of incorporating polyethylenimine (PEI) into the core and coating with bis(polyoxyethylene bis[amine]) (PEGA) on alginate-poly-L-lysine microcapsules.
• To characterize the mechanical properties, mass transfer characteristics, and chemical composition of the modified microcapsules.
• To evaluate the potential of these modifications for improved microcapsule performance.

Main Methods:

• Alginate-poly-L-lysine microcapsules were prepared with modifications including PEI or carboxyl methyl cellulose (CMC) in the core.
• Microcapsules were coated with PEGA on their surface.
• Characterization involved assessment of mechanical stability, mass transfer properties, and chemical composition.

Main Results:

• Polyethylenimine (PEI) treatment significantly enhanced the mechanical stability of the microcapsules.
• The PEI treatment did not interfere with subsequent poly-L-lysine or PEGA coating processes.
• Bis(polyoxyethylene bis[amine]) (PEGA) successfully coated the microcapsules, exhibiting mass transfer properties comparable to poly-L-lysine coated microcapsules.

Conclusions:

• Incorporating PEI into alginate-poly-L-lysine microcapsules is an effective strategy to improve their mechanical robustness.
• PEGA coating offers a viable surface modification that preserves desirable mass transfer characteristics.
• These modified microcapsules show promise for advanced applications requiring enhanced stability and controlled release.