Fat emulsification measured using NMR transverse relaxation

Area of Science:

• Physical Chemistry
• Materials Science
• Biophysics

Background:

• Accurate droplet size measurement is crucial for characterizing emulsions.
• Existing methods may have limitations in precision or applicability.
• Nuclear Magnetic Resonance (NMR) offers potential for non-invasive analysis.

Purpose of the Study:

• To develop and validate a novel NMR-based method for determining droplet size in oil-in-water emulsions.
• To investigate the relationship between NMR transverse relaxation rate and droplet size.
• To confirm the theoretical underpinnings of the proposed NMR technique.

Main Methods:

• Utilized Nuclear Magnetic Resonance (NMR) spectroscopy, specifically measuring longitudinal (1/T1) and transverse (1/T2) relaxation rates.
• Employed Echo Planar Imaging (EPI) at 37°C for in vitro measurements.
• Conducted proton random walk simulations and applied analytical solutions based on an outer sphere relaxation model.

Main Results:

• Observed a significant increase in the transverse relaxation rate (1/T2) with increasing mean droplet size (0.4-20.9 µm).
• Found no significant change in the longitudinal relaxation rate (1/T1).
• Experimental results showed good agreement with theoretical predictions and simulations.

Conclusions:

• The NMR transverse relaxation rate is a sensitive indicator of droplet size in oil-in-water emulsions.
• This novel NMR method provides a robust and accurate approach for emulsion characterization.
• The findings support the use of NMR for non-invasive droplet sizing in various applications.