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Effect of Kernel Size and Mill Type on Protein, Milling Yield, and Baking Quality of Hard Red Spring Wheat

Baasandorj, Tsogtbayar, Ohm, Jae-Bom, Manthey, Frank, Simsek, Senay
Cereal Chemistry Journal 2015 v.92 no.1 pp. 81-87
breadmaking quality, breads, correlation, flour, gliadin, hard red spring wheat, loaves, milling, milling industry, molecular weight, seeds, yields
Optimization of flour yield and quality is important in the milling industry. The objective of this study was to determine the effect of kernel size and mill type on flour yield and end-use quality. A hard red spring wheat composite sample was segregated, based on kernel size, into large, medium, and small kernels, and unsorted kernels. The four fractions were milled on three laboratory roller mills: Brabender Quadrumat. Jr., Quadrumat. Sr., and Buhler type MLU-202. Large kernels had consistently higher flour yield than small kernels across mills, with the Quadrumat Jr. mill showing the lowest flour yield. Mill type and kernel size significantly affected variation in flour protein molecular weight distribution. When compared to large kernels, flour milled from small kernel fraction contained higher gliadin fractions and SDS unextractable high molecular weight polymeric proteins, which had positive correlations with bread loaf volume (r=0.61, p<0.05) and mixograph peak time (r=0.84, P<0.001), respectively. Overall, small kernels could contribute to enhancing flour breadmaking quality while having detrimental effect on milling yield.