Pharmaceutical Quality by Design Approach to Develop High-Performance Nanoparticles for Magnetic Hyperthermia

Area of Science:

• Biomedical Engineering
• Materials Science
• Nanotechnology

Background:

• Magnetic hyperthermia offers therapeutic promise but is limited by challenges in large-scale, high-quality superparamagnetic iron oxide nanoparticle (SPION) synthesis.
• Scalable manufacturing is crucial for SPION quality control, clinical translation, and regulatory approval.

Purpose of the Study:

• To implement a risk-based Quality by Design (QbD) approach for scalable SPION production via flame spray pyrolysis (FSP).
• To optimize SPION size and composition for enhanced magnetic hyperthermia performance.
• To demonstrate the feasibility of pilot-scale manufacturing and assess biocompatibility and efficacy.

Main Methods:

• Utilized flame spray pyrolysis (FSP) for SPION synthesis, incorporating a design of experiments (DoE) for precise size control (6-30 nm).
• Modeled the relationship between SPION size, dopant composition (Zn, Mn, Mg), and intrinsic loss power (ILP).
• Conducted pilot-scale production, cytotoxicity assays, and in vitro hyperthermia studies using Caco-2 cells.

Main Results:

• FSP enabled fine-tuning of SPION composition and size, establishing a strong nonlinear correlation between these parameters and ILP.
• ILP showed a higher correlation with coercivity and remanence than saturation magnetization.
• Optimized midsized (15-18 nm) Mn0.25Fe2.75O4 nanoparticles demonstrated superior hyperthermia performance, inducing 80% greater cell death than undoped SPIONs.
• Pilot-scale production confirmed manufacturing feasibility, and cytotoxicity tests confirmed biocompatibility.

Conclusions:

• The QbD approach ensures robust, scalable, and predictable SPION production for magnetic hyperthermia.
• Optimized Mn0.25Fe2.75O4 nanoparticles show significant potential for improved cancer therapy.
• This systematic methodology facilitates the clinical translation of high-performance SPIONs.