| Air-Aspirated Wheat Cleaning in Grading and in Separation by Functional Properties. Cereal Chemistry 66:15-18 |
| Bettge,A.D., Rubenthaler,G.L. and Pomeranz,Y. |
| Thirty-seven commercial wheat samples
(17 soft white and 20 hard red) were graded by State of Washington/U.S. Department
of Agriculture-Federal Grain Inspection Service inspectors for dockage and foreign
material. The clean grain and dockage were recombined, mixed, and separated
by the Carter dockage tester and the Kice dockage tester DT4 (KDT). The KDT
operates on the principal of air aspiration. Results from the KDT apparatus
at a low airflow were highly correlated (r= 0.889) with the results of the Federal
Grain Inspection Service separation. At high airflow, the KDT also separated
while kernels of various densities. The separated kernels significantly differed
in 1,000-kernel weight, ash, near-infrared hardness, and protein content from
the portion of the sample passing through the system. The hard wheat samples
also differed in kernel density (determined b helium pycnometer) between these
fractions. Separated fractions were milled experimentally and evaluated in cookie
making. The less dense fraction exhibited higher flour ash, protein, and mixograph
absorption but lower flour yield and cookie diameter.
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