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

Abstract

Cereal Chem. 66(2):117-120 We investigated the viability, physical properties, chemical position, and various properties and dry-milling response. Increasing drying air dry-milling responses of six yellow dent corn hybrids having various temperature from 25 to 60 C increased percent kernel stress cracks from genotype parents. The experimental design included 1) kernel size, 0-3% to 23-74%, respectively, depending on hybrid variety. For Stein hardness index, breakage susceptibility, flotation, bulk density, 100-kernel breakage, the range at 25' C was 1-7% and at 600 C, 3-9%. The dry-milled weight, and percent stress cracks as the major physical properties; 2) grit yield was decreased for every corn hybrid by raising drying temperature percent nitrogen, fat, starch, ash, fiber, linoleic acid, fat acidity, and from 25 to 600 C. Drying air temperature had little or no effect on any other nitrogen solubility index as compositional parameters; 3) pilot-plant roll- physical or chemical characteristic studied, although these other properties dry-milling; and 4) the effects of hybrid and drying temperature on the did vary significantly with hybrid type. The importance of corn to the United States as an export commodity and as a domestic food and feed commodity is well documented. Corn that has been chipped, cracked, or physically or chemically changed may lose economic value. Corn hybrids have generally been developed to show increased field yields rather than quality as related to milling, storage, and shipping properties. One purpose of this study was to examine physical and chemical characteristics of some corn hybrids from various genotype parents. This work also related kernel breakage and stress cracking to the corn dry-milling process, and indicated which of these corn hybrids will be able to withstand the rigorous degerming, grinding, and sieving steps necessary to yield large grits desired by the food and beverage industries. Objectives of this research were 1) to determine physical and chemical characteristics of six corn hybrids dried with 25 and 60° C air, and 2) to correlate dry-milling response based on kernel breakage and other physical characteristics. MATERIALS AND METHODS