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NMR imaging investigation of rice cooking

TitleNMR imaging investigation of rice cooking
Publication TypeJournal Article
Year of Publication2005
AuthorsKasai, M, Lewis, A, Marica, F, Ayabe, S, Hatae, K, Fyfe, CA
JournalFood Research International
Type of ArticleArticle
ISBN Number0963-9969
Keywordscooking process, first echo, GRAIN, NMR imaging, rice, T-2 image, water content

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. (c) 2004 Elsevier Ltd. All rights reserved.

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