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United States Department of Agriculture

Agricultural Research Service

Title: Studies of Alternatives to Sulfur Dioxide in Corn Wet-Milling Steeping under Alkaline Conditions

item Dailey Jr, Oliver

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: June 1, 2004
Publication Date: August 26, 2004
Citation: Dailey Jr, O.D. 2004. Studies of alternatives to sulfur dioxide in corn wet-milling steeping under alkaline conditions. Meeting Abstract.

Technical Abstract: In conventional corn wet-mill steeping, sulfur dioxide (SO2) disperses the protein matrix that encapsulates the starch granules via the cleavage of disulfide bonds. This presentation describes laboratory investigations of the use of alternatives to sulfur dioxide (under alkaline conditions) in the corn wet-milling process, with starch recovery as the primary criterion for comparison. These studies employed a modified 100-g wet-milling procedure in which corn kernels were steeped for 4 h, then coarsely ground, and steeped for an additional 18-22 h. After steeping, the material was processed for recovery of germ, fiber, starch, and gluten. Initial steeping was done in either water or a solution containing 0.50% of a base. Subsequent grinding and steeping were done in solutions containing 0.50% base and sodium nitrite (either 0.20% or 0.50%). The following bases were investigated: sodium carbonate, sodium bicarbonate, sodium hydroxide, and potassium carbonate. Highest starch yields were obtained using steeping solutions containing 0.50% Na2CO3/0.50% NaNO2. The yields were higher than those obtained for the same steeping solution under standard 24-h steeping conditions, but were significantly lower than those obtained by steeping with SO2 under acidic conditions.

Last Modified: 4/19/2015
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