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Thickness Grading Impacts on Milling and Physicochemical Properties of Long-Grain Rice

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  131592878,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: http://dx.doi.org/10.13031/aim.20131592878) @2013
Authors:   Brandon C Grigg, Terry J Siebenmorgen
Keywords:   Head rice yield; Milled rice yield; Rough rice; Thickness grading.

Abstract. As variations in kernel uniformity can affect rice milling performance, limited thickness-grading to remove thin kernels was evaluated for effects on milling yields. Along with unfractioned (UNF) rice of four long-grain cultivars, rough rice was mechanically sieved, resulting in two thickness fractions, Thick (> 2 mm) and Thin (< 2 mm). Milled-rice yield (MRY) and head-rice yield (HRY) were determined for each cultivar/fraction. Thickness grading resulted in between 67% and 90% Thick kernels. MRYs of Thick kernels were greater than those of Thin kernels, and were generally greater than UNF. Moreover, HRYs of Thick kernels were greater than both Thin and UNF. Thickness-grading improved milling-yield parameters, and showed a trend for reducing chalkiness of Thick kernels when compared to UNF. Although it would create an extra process operation and flow, benefits to milling yield could justify this procedure.

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