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Using MRI to Study High Pressure Assisted Nutrient Infusion.

Julia D Kerr1, Daniel M Gruber1, Matthew P Augustine1

  • 1Department of Chemistry, University of California, Davis, CA 95616, USA.

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|November 26, 2022
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Summary
This summary is machine-generated.

High pressure assisted infusion significantly speeds up nutrient delivery into foods like apples by nearly 100-fold. This study monitored infusion using magnetic resonance imaging (MRI), finding constant pressure most effective.

Keywords:
MRIdiffusionhigh pressurehigh pressure assisted infusion

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Area of Science:

  • Food Science and Technology
  • Biophysics
  • Chemical Engineering

Background:

  • High pressure processing (HPP) is a non-thermal technology for food preservation and modification.
  • In situ monitoring of HPP processes is crucial for understanding and optimizing nutrient infusion.
  • Magnetic Resonance Imaging (MRI) offers non-invasive visualization capabilities for complex food matrices.

Purpose of the Study:

  • To monitor high pressure assisted nutrient infusion into food matrices in situ.
  • To evaluate the impact of different pressure strategies on infusion efficiency.
  • To assess the role of food structure, such as fruit peel, on solute transport.

Main Methods:

  • Modified an off-the-shelf pressure reactor with an MRI detection circuit to accommodate food samples.
  • Used peeled apple flesh as a model for fibrous food, enhancing water signal with paramagnetic manganese cations.
  • Employed MRI relaxation contrast to visualize bulk water movement and track nutrient infusion during pressurization.

Main Results:

  • High pressure assisted infusion achieved nearly 100-fold faster infusion times compared to ambient pressure.
  • Constant pressure operation showed no significant difference in nutrient mass transport compared to pressure gating or ramping.
  • The presence of an apple peel was confirmed to impede solute transport into the fruit flesh.

Conclusions:

  • In situ MRI monitoring effectively tracked pressure-induced nutrient infusion in fibrous food models.
  • Constant pressure is as effective as dynamic pressure strategies for high pressure assisted infusion.
  • High pressure processing offers a significantly accelerated method for nutrient infusion into food products.