Microcapsules prepared from alginate and a photosensitive poly(L-lysine)

Area of Science:

• Polymer Chemistry
• Biomaterials Science
• Cell Encapsulation Technology

Background:

• Development of advanced biomaterials for drug delivery and tissue engineering is crucial.
• Photosensitive polymers offer unique cross-linking capabilities for controlled material properties.
• Microencapsulation systems require robust membranes with tunable permeability.

Purpose of the Study:

• To synthesize and characterize a novel photosensitive poly(L-lysine).
• To evaluate its application in creating light-cross-linked microcapsules.
• To assess the viability and proliferation of encapsulated cells within these microcapsules.

Main Methods:

• Synthesis of alpha-phenylcinnamylideneacetylated poly(L-lysine) with 10% modification.
• Preparation of poly(L-lysine)-alginate microcapsules.
• Characterization of capsule properties including light-induced cross-linking and protein permeability.
• Encapsulation and culture of GH3 rat pituitary tumor cells.

Main Results:

• The photosensitive poly(L-lysine) exhibited an absorption maximum at 329 nm.
• Light irradiation significantly strengthened the poly(L-lysine)-alginate microcapsules.
• The photo-cross-linked membrane demonstrated selective protein permeability (cytochrome C > myoglobin > serum albumin).
• Encapsulated GH3 cells proliferated to approximately 4 x 10(5) cells/mL within 6 days.

Conclusions:

• Photosensitive poly(L-lysine) is a viable material for creating robust, light-cross-linked microcapsules.
• The developed microencapsulation system supports cell viability and proliferation.
• This technology holds potential for applications in cell therapy and drug delivery.