Publication no. C-1997-0618-06R |  VIEW ARTICLE

Single-Stage Short-Duration Tempering of Corn for Dry-Milling.

Suhas K. Mehra (1) and S. R. Eckhoff (2,3). (1) Visiting postdoctoral research associate, Department of Agricultural Engineering, University of Illinois, Urbana, IL 61801. (2) Professor, Department of Agricultural Engineering, University of Illinois, Urbana, IL 61801. Mention of product or trade names does not imply endorsement by the University of Illinois. (3) Corresponding author. E-mail: <sre@sugar.age.uiuc.edu> Cereal Chem. 74(4):484-488. Accepted April 16, 1997. Copyright 1997 by the American Association of Cereal Chemists, Inc.

Pilot-scale dry-milling runs were conducted to study the feasibility of using a short-duration single-stage tempering procedure for the tempering-degerminating system, instead of the 17.8-21.5 hr of conventional three-stage tempering procedures reported in the scientific literature. Using a Beall degerminator No. 0, pilot-scale dry-milling experiments were conducted at 10 tempering levels: 0, 5, 10, 15, 30, 45, 60, 120, 180, and 240 min. Variation in moisture content of through- and tail-stock fractions, degerminator throughput, ratio of tail- to through-stock, yields of different sized grits from tail- and through-stock fractions, and the recovery of germ and pericarp were used to compare tempering periods. A decrease in the milling action was observed for tempering durations >30 min. A tempering period of 15 min gave the highest grit recovery and a 30-min tempering period resulted in the highest germ and pericarp recovery. Based on these results, it was concluded that short tempering periods of 10-30 min as compared to 17.8-21.5 hr could be used for the tempering-degerminator system.