Loss of moisture from harvested rice seeds on MRI

Magnetic Resonance Imaging
Nobuaki IshidaHiromi Kano

Abstract

The drying of rough rice seeds was visualized with the single point mapping imaging (SPI) technique by magnetic resonance imaging (MRI) at various temperatures, and the results were compared with those of the oven-drying method. Most of the water was present in the embryo and endosperm. The water reduction rate was larger on the outside than in the central position of the rice seeds at 50 degrees C, although this discrepancy was not obvious at 40 degrees C. Water reduction was brought about with time according to the kinetics of the multiple components, for both MR imaging and the ventilated-oven method. Images were continuously measured (10 min per image for 100 min). The reduction rate of water from rice kernels increased rapidly with temperature (up) to near 60 degrees C then rose slowly above 60 degrees C. Latent heat was calculated as 15 kcal/mol. deg from the changes of drying rate at temperatures below 60 degrees C.

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Citations

Jul 16, 2008·Journal of Magnetic Resonance·Prodromos ParasoglouM L Johns
Mar 21, 2007·Magnetic Resonance Imaging·Helene Fast SeefeldtBernd Wollenweber
Mar 28, 2012·The Plant Journal : for Cell and Molecular Biology·Ljudmilla BorisjukThomas Neuberger
Jun 1, 2010·Journal of Magnetic Resonance Imaging : JMRI·Susumu MoriyaMitsunori Ishikawa
Sep 26, 2006·Magnetic Resonance Imaging·Mika KoizumiHiromi Kano
Jul 18, 2006·Annals of Botany·Kaori KikuchiHiromi Kano

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