Evaluation of the Resistance-Capacitance Method for Detection of Reduced Corn Wet Milling Quality
Rausch, Kent David
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https://hdl.handle.net/2142/72466
Description
Title
Evaluation of the Resistance-Capacitance Method for Detection of Reduced Corn Wet Milling Quality
Author(s)
Rausch, Kent David
Issue Date
1993
Doctoral Committee Chair(s)
Eckhoff, S.R.
Department of Study
Agricultural Engineering
Discipline
Agricultural Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Agriculture, Food Science and Technology
Engineering, Agricultural
Abstract
A procedure using the resistance-capacitance (RC) properties of corn was evaluated for detection of corn that had reduced wet milling quality. In 1991 and 1992, three hybrids were dried at temperatures between ambient and 115$\sp\circ$C in batch dryers. Additional samples were obtained from area elevators in 1992, with temperatures ranging from 52 to 260$\sp\circ$C. A baseline reference relationship was developed between log$\sb $-resistance and capacitance using ambient-dried samples. RC properties of samples dried at temperatures greater than 50$\sp\circ$C were compared to the baseline and the displacement value (DV) determined. Selected drying treatments were wet milled using a laboratory-scale procedure and evaluated. Test weight, 100 kernel weight and kernel density and volume were determined to investigate their influence on DV.
Starch recovery decreased significantly for samples batch-dried at temperatures 70$\sp\circ$C and greater. All samples dried at 115 to 136$\sp\circ$C had significantly lower starch recoveries and significant increases in total fiber yields.
The effects of hybrid and harvest moisture level on the RC properties of ambient-dried samples were small, allowing the baseline reference to be applied to a wide range of corn samples. In 1992, the baseline shifted upward from the 1991 baseline by 0.5 units on the log$\sb $-resistance axis. DV increased significantly at drying temperatures above 50$\sp\circ$C for batch-dried samples. While DV correlated well with drying conditions in the batch-dried samples, there was a low correlation with commercial samples. This is attributed to the relatively limited number of hybrids used in the batch sample study, compared to the wide assortment of hybrids collected at the area elevators. DV was not indicative of starch yield or recovery. Some other set of factors, such as growing conditions or hybrid, had an effect on DV. For most of the commercial samples, no significant differences in DV were found but there were significant differences in physical properties, thus it was concluded that physical properties and DV are independent variables.
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