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Related Experiment Videos

Mealiness assessment in apples using MRI techniques.

P Barreiro1, J Ruiz-Cabello, M E Fernández-Valle

  • 1Departamento de Ingeniería Rural, ETSIA, Madrid, Spain. labpropfis@iru.etsia.upm.es

Magnetic Resonance Imaging
|April 24, 1999
PubMed
Summary

Magnetic resonance imaging (MRI) revealed that mealy apples, stored at 2 degrees C, exhibit significantly lower T2 values and distinct T2 map histograms compared to non-mealy apples. This indicates structural changes and altered water content associated with mealiness in apples.

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Area of Science:

  • Food Science
  • Biophysics
  • Agricultural Engineering

Background:

  • Apple mealiness is a significant post-harvest storage issue affecting fruit quality.
  • Understanding the biophysical changes associated with mealiness is crucial for improving storage strategies.

Purpose of the Study:

  • To investigate the potential of magnetic resonance imaging (MRI) to differentiate between mealy and non-mealy apples.
  • To correlate MRI parameters with apple texture and structure.

Main Methods:

  • Magnetic resonance imaging (MRI) was used to capture multi-slice-multi-echo images of apples stored under controlled atmosphere (non-mealy) and at 2°C (mealy).
  • T2 relaxation times and T2 map histograms were analyzed.
  • Correlation with Magness-Taylor firmness test deformation parameters was assessed.

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Main Results:

  • Mealy apples (3/4) showed significantly lower minimum T2 values compared to non-mealy apples (1/4).
  • A significant negative correlation (r = -0.76) was found between pixels with T2 < 35 ms and fruit deformation.
  • T2 maps of mealy apples exhibited regional contrast variations and skewed histograms with a high T2 tail, unlike non-mealy apples.

Conclusions:

  • MRI, specifically T2 relaxation times and T2 map histograms, can effectively distinguish between mealy and non-mealy apples.
  • Lower T2 values and specific histogram features in mealy apples suggest a more desegregated structure and reduced juiciness.
  • These MRI findings may precede internal breakdown, highlighting potential for early detection.