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United States Department of Agriculture

Agricultural Research Service

Title: Effect of Steeping Chemicals on Kernel Hydration During Laboratory Steeping of Yellow Dent Corn Hybrids

Author
item Dailey Jr, Oliver

Submitted to: Corn Utilization Conference Proceedings
Publication Type: Proceedings
Publication Acceptance Date: June 3, 2002
Publication Date: June 5, 2002
Citation: Dailey Jr, O.D. 2003. Effect of steeping chemicals on kernel hydration during laboratory steeping of yellow dent corn hybrids. Corn Utilization Conference Proceedings. p. 61.

Technical Abstract: Addition of either SO2 (1,2) or lactic acid (LA) (3,4) has been reported to accelerate the rate of moisture absorption in steeping dent corn hybrids. Since accelerated hydration of the kernel could result in shorter steeping times and, consequently, lower milling costs, studies were undertaken to determine the generality of these findings. In studies of the hydration of bulk kernel (12-15 kernels) samples of commercial yellow dent corn in five different steep solutions (water; 0.20%SO2; 0.40%SO2; 0.50% LA; 0.20% SO2/0.50% LA) for 13 time periods ranging from 15 min to 48 hr at 52 degrees C and 45 degrees C, there was no significant difference in water absorption for any of the steep solutions or time periods. Hydration studies of bulk kernel samples (25 g) of three experimental hybrids selected on the basis of differences in starch content were conducted (three replications). The studies used the five different steep solutions listed above for 3 time periods (30 min, 4 hr, 24 hr) at 52 degrees C. For 30 min and 24 hr, there was no significant difference in water absorption for any of the steep solutions. For 4 hr, the kernels consistently absorbed more water in solutions containing S02 and/or LA than in water only. The hybrid with the lowest starch content absorbed the least water. The hybrid with intermediate starch content absorbed the most. These results indicate that the steeping chemicals SO2 and LA generally do not enhance water absorption of yellow dent corn kernels.

Last Modified: 12/18/2014
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