Design and Characterization of a Bioinspired PAMAM@Poly(Caffeic Acid) Magnetite Nanocarrier for Curcumin Delivery

Area of Science:

• Biomaterials Science
• Nanotechnology
• Drug Delivery Systems

Background:

• Efficient intracellular drug delivery is crucial for therapeutic efficacy.
• Nanocarriers are essential for stabilizing and controlling the release of bioactive compounds.
• Curcumin, a potent natural compound, suffers from poor bioavailability and stability.

Purpose of the Study:

• To develop a bioinspired nanohybrid system for efficient and sustained intracellular delivery of curcumin.
• To integrate generation 4.0 poly-(amidoamine) (PAMAM) dendrimers with poly-(caffeic acid)-coated magnetite nanoparticles (PCA@Fe3O4).
• To evaluate the stability, loading capacity, release profile, and in vitro cytotoxicity of the developed nanohybrid system.

Main Methods:

• Synthesis and characterization of poly-(amidoamine) dendrimers and poly-(caffeic acid)-coated magnetite nanoparticles (PCA@Fe3O4).
• Formation of the PAMAM-PCA@Fe3O4 nanohybrid system for curcumin encapsulation.
• Quantification of curcumin loading using UV-Vis spectroscopy.
• Analysis of nanoparticle size and morphology using Atomic Force Microscopy (AFM) and Transmission Electron Microscopy (TEM).
• In vitro release studies in phosphate-buffered saline (PBS) at pH 7.4 and 37 °C.
• In vitro cytotoxicity assays using MRC-5 fibroblasts.

Main Results:

• The PAMAM-PCA@Fe3O4 nanohybrid system successfully encapsulated curcumin, improving its stability.
• Curcumin loading reached approximately 190 μg per sample.
• AFM and TEM confirmed the spherical morphology and size progression (Fe3O4: ~26 nm, PCA@Fe3O4: ~43 nm, PAMAM-PCA@Fe3O4: ~66 nm).
• Sustained curcumin release was observed, with ~33% released over 24 hours in PBS.
• The nanohybrid system demonstrated good biocompatibility, while curcumin-loaded nanohybrids showed dose-dependent cytotoxicity.

Conclusions:

• The developed PAMAM-PCA@Fe3O4 nanohybrid system is a promising platform for efficient, long-lasting, and controlled intracellular delivery of curcumin.
• The nanohybrid structure enhances curcumin stability and bioavailability.
• The system exhibits favorable biocompatibility and controlled release kinetics, paving the way for potential therapeutic applications.