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Synthesis of Biocompatible Superparamagnetic Iron Oxide Nanoparticles (SPION) under Different Microfluidic Regimes
Jörg Schemberg1, Abdelouahad El Abbassi1, Annerose Lindenbauer1
1Institute for Bioprocessing and Analytical Measurement Techniques (iba), 37308Heiligenstadt, Germany.
ACS Applied Materials & Interfaces
|October 12, 2022
Summary
Microfluidics enable optimized synthesis of superparamagnetic iron oxide nanoparticles (SPION). This improved SPION quality and stability for enhanced medical diagnostic and therapeutic applications.
Area of Science:
- Nanotechnology
- Biomedical Engineering
- Materials Science
Background:
- Superparamagnetic iron oxide nanoparticles (SPION) offer significant potential for medical diagnostics and therapeutics, including MRI contrast enhancement, hyperthermia, and drug delivery.
- Despite commercial availability, there is a continuous demand for improved quality and optimized synthesis protocols for SPION.
- Current batch synthesis methods often face limitations in controlling particle characteristics and scalability.
Purpose of the Study:
- To develop and optimize a microfluidic synthesis strategy for producing high-quality superparamagnetic iron oxide nanoparticles (SPION).
- To investigate the impact of various synthesis parameters, including flow conditions, pH, temperature, and coating materials, on SPION characteristics.
- To establish an optimal protocol for synthesizing biocompatible SPION suitable for cellular labeling and medical applications.
Main Methods:
- Utilized a microfluidic platform employing the coprecipitation approach for SPION synthesis.
- Investigated synthesis parameters in both continuous and segmented flow microfluidic systems.
- Systematically varied parameters such as temperature, pH, iron salt concentration, and carboxymethyl dextran coating concentration.
Main Results:
- Microfluidic synthesis, particularly in continuous flow, yielded SPION with smaller sizes and enhanced stability compared to segmented flow and traditional batch methods.
- Identified optimal synthesis conditions: 6.5 M NH4OH base, Fe2+/Fe3+ ratio of 4.3/8.6, 20 mg/mL carboxymethyl dextran coating, and a temperature of 70 °C.
- Synthesized SPION demonstrated efficient labeling of human platelets without compromising cell viability.
Conclusions:
- Microfluidics provide a superior platform for the controlled and optimized synthesis of superparamagnetic iron oxide nanoparticles.
- The established protocol yields high-quality, stable, and biocompatible SPION suitable for advanced biomedical applications.
- This work contributes a refined method for nanoparticle development, advancing their use in medical diagnostics and therapies.
