Measurement and fissuring of rice kernels during quasi-moisture sorption by image analysis |
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Authors: | N Shimizu MA Haque M Andersson T Kimura |
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Institution: | aGraduate School of Life Environmental Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba-shi, Ibaraki-Prefecture 305-8572, Japan;bFoss Japan Ltd., Toyo 5-30-13, Koto-ku, Tokyo 135-0016, Japan;cGraduate School of Agriculture, Hokkaido University, Kita-9, Nishi-9, Kita-ku, Sapporo 060-8589, Japan |
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Abstract: | Fissuring associated with kernel elongation was evident in a moisture-adsorbing environment at 15 °C of relative humidity 88.72±0.28% with moisture content from 6% (d.b.) to 16.3% (d.b.). The average length and width of 800 kernels was measured during the sorption test using a Cervitec Grain Inspector equipped with two digital cameras. Samples were exposed to both a moisture-adsorbing and desorbing environments at 15 °C with relative humidities of 23.4±0.53%, 55.9±0.27%, 70.98±0.28% and 88.72±0.28%. On image analysis, the kernels changed in size from 5.13 to 4.84 mm in length and 2.9 to 2.73 mm in width. Both length and width changed as expected during moisture-adsorbing and moisture-desorbing tests. Fissured kernel percent was related to changes in the average length of the kernels during the moisture-adsorbing tests. The average length and fissured kernel percent of rice kernels measured by image analysis may be considered as a reliable indicator of changes in their dimensions during quasi-static moisture sorption processes. |
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Keywords: | Brown rice Moisture Sorption Fissure Image analysis |
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