AACCI Approved Methods Technical Committee Report on Using the CHOPIN CD1 Laboratory Mill for Experimental Milling (AACCI Approved Method 26-70.01) The experimental wheat milling method using the CHOPIN CD1 mill was evaluated in a collaborative trial with 10 laboratories representing 5 countries and analyzing 14 wheat samples. Statistical analyses of the results showed the method is able to differentiate the milling quality of wheat samples with reasonable repeatability and reproducibility (RSDr ≈ 1–6% over the various milling fractions; RSDR ranging from 2 to 44%, depending on fraction and sample). Every lab was required to run the samples in triplicate; thus, the observed relative standard deviation of repeatability (RSDr) values for most of the samples were <1, which indicates the mill results are very repeatable. The relative standard deviation of reproducibility (RSDR) values were 3–4 times higher than the RSDr values. Reproducibility was influenced by different equipment conditions at the laboratories. The results of this collaborative trial show that improved results (reproducibility results closer to repeatability) could be obtained with consistently well-maintained mills, as shown by the results for new CD1 mills at the time of initial production. The introduction of AACCI Approved Method 26-70.01 also will assist operators by providing a consistent procedure. |