Abstract
The visualization and quantification of the cooking of rice by NMR imaging is reported for Japonica rice ( Oryza sativa. L. Japonica cv. Nipponbare) as a test sample. Rice was cooked in a vial for various times and then studied at room temperature by NMR imaging. The multi slice multi echo method was employed to obtain two-dimensional proton images. Images using only the first echo clearly revealed the changes in the water content of the rice grains during cooking. T 2 images were obtained from the same experiments but using the first 16 echoes and converted to images of the water distributions using an empirical T 2 vs. water content calibration determined from a series of reference water/rice starch mixtures. The total limiting water content within the rice grains was calculated and it agreed with that calculated from the known water/rice ratio used, indicating that both the concentration and distributions of water within the rice grains during cooking obtained from the NMR imaging were quantitatively reliable.
Published Version
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