Nanosponge Innovations: Revolutionizing Targeted Drug Delivery

Abstract

Nanosponges emerge as sophisticated nanoporous platforms, engineered through crosslinking of polymers like cyclodextrins, ethylcellulose, and polyvinyl alcohol to form stable, three-dimensional matrices with submicron cavities ideal for entrapping diverse drug molecules. These structures excel in overcoming solubility barriers for BCS Class II/IV compounds, leveraging non-covalent interactions, hydrogen bonding, vander Waals forces, and inclusion complexesto achieve loading efficiencies up to 33%, while enabling pH-responsive, sustained release via polymer hydration and diffusion.

Diverse fabrication techniques, including emulsion-solventdiffusion, ultrasound-assisted synthesis, microwave irradiation, and melt methods, offer flexibility in tuning porosity, particle size (<1 μm, optimal 200-300 nm for dermal routes), and zeta potential (>+30 mV for stability). Rigorous characterization employs DLS, SEM/TEM, FTIR, helium pycnometry for porosity, and UV spectroscopy for entrapment, confirming biocompatibility, thermal stability to 300°C, and self-sterilizing properties due to 0.25 μm pores.

Broad applications encompass oncology (paclitaxel, doxorubicin), antifungals (itraconazole, voriconazole), and topicals, with marketed formulations like Tamodex 20 and Piroxicam-20 validating clinical translation. Advantages include cost-effectiveness, biodegradability, taste-masking, and reduced side effects, though limitations persist, burst release risks, exclusion of macromolecules >400 Da, and scale-up challenges. Future prospects focus on magnetic targeting, greener solvents, and hybrid systems for personalized medicine.