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Recovery of Lysine from Corn Steepwater

November 1999 Volume 76 Number 6
Pages 949 — 952
Dennis J. O'Brien 1 , 2 and James C. Craig , Jr. 1

U.S. Department of Agriculture, Eastern Regional Research Center, 600 E. Mermaid Lane, Wyndmoor, PA 19038. Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of the name by the USDA implies no approval of the product to the exclusion of others that may also be suitable. Corresponding author: Phone: 215-233-6601; Fax: 215-233-6795; E-mail: dobrien@arserrc.gov

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Accepted August 9, 1999.

One approach to increasing the utilization of agricultural products is fractionation of low-value materials to yield high-value products. In this study, lysine recovery from corn steepwater, an internal processing stream generated in the wet-milling of corn, was investigated. A weakly acidic cation exchange resin was employed to selectively recover lysine from corn steepwater at pH 7.0. In column studies, the product from the ion exchange operation had a lysine content of 4–6% (db). The only other amino acid in the product was arginine. The presence of sodium, potassium, and magnesium ions at significant concentrations in the steepwater limited the lysine content of the product because of competitive adsorption on the resin. The lysine-enriched product reported here is 4–10 times higher in lysine content than other corn milling coproducts and could potentially be useful as a lysine supplement in animal feeds.

This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. American Association of Cereal Chemists, Inc., 1999.