A sieved 25-g sample is examined externally for the natural translucency associated with hardness. Bleached kernels may be cut transversely to determine vitreousness. Starch damage is analyzed using AACC Method 76-31. Also called Starch damage, Spectrophotometric method. Wheat is milled on an Allis-Chalmers laboratory mill using the GRL sifter flow as described by Black et al.
Flour yield is expressed as a percentage of cleaned wheat on a constant moisture basis.
The procedure for pilot milling is described by Fajardo et al. See the note discussing the Canadian Grain Commission's change from Kjeldahl to CNA methods in August 1996. Near-infrared transmission spectrosocopy is used for the protein survey samples. PSI is a measure of the hardness of a wheat kernel. AACC Method No.