Cereal Chem 66:117   |  VIEW ARTICLE

Physical, Chemical, and Dry-Milling Characteristics of Corn Hybrids from Various Genotypes.

A. J. Peplinski, M. R. Paulsen, R. A. Anderson, and W. F. Kwolek. Copyright 1989 by the American Association of Cereal Chemists, Inc. 

We investigated the viability, physical properties, chemical position, and dry-milling responses of six yellow dent corn hybrids having various genotype parents. The experimental design included 1) kernel size, hardness index, breakage susceptibility, flotation, bulk density, 100-kernel weight, and percent stress cracks as the major physical properties; 2) percent nitrogen, fat, starch, ash, fiber, linoleic acid, fat acidity, and nitrogen solubility index as compositional parameters; 3) pilot-plant roll-dry-milling; and 4) the effects of hybrid and drying temperature on the various properties and dry-milling response. Increasing drying air temperature from 25 to 60 C increased percent kernel stress cracks from 0-3% to 23-74%, respectively, depending on hybrid variety. For Stein breakage, the range at 25 C was 1-7% and at 60 C, 3-9%. The dry- milled grit yield was decreased for every corn hybrid by raising drying temperature from 25 to 60 C. Drying air temperature had little or no effect on any other physical or chemical characteristic studied, although these other properties did vary significantly with hybrid type.