Comparison of the core size distribution in iron dextran complexes using Mössbauer spectroscopy and X-ray diffraction

Area of Science:

• Materials Science
• Solid State Physics
• Biomedical Engineering

Background:

• Iron dextran complexes are used therapeutically.
• Characterizing their physical properties, like core size, is crucial for understanding their behavior.
• Mössbauer spectroscopy is a sensitive technique for studying iron-containing materials.

Purpose of the Study:

• To qualitatively assess iron dextran core size distributions using Mössbauer spectroscopy.
• To compare spectral characteristics across samples from different suppliers.
• To correlate Mössbauer data with X-ray line broadening measurements.

Main Methods:

• Mössbauer spectroscopy was performed on eight iron dextran samples at 100 K, 77 K, and 4 K.
• Analysis focused on the coexistence of sextet and doublet spectral components.
• Results were compared with average core diameter estimates from X-ray line broadening.

Main Results:

• Mössbauer spectra showed significant variations in the relative doublet contribution and hyperfine fields.
• Three distinct types of core size distributions were identified.
• At 4 K, the doublet vanished, revealing narrow and symmetric hyperfine field distributions.

Conclusions:

• Mössbauer spectroscopy provides a valuable qualitative method for differentiating iron dextran core size distributions.
• Temperature-dependent analysis is key to observing spectral changes and inferring structural properties.
• The findings align with X-ray diffraction data, validating the spectroscopic approach.