Comparison of alkali and conventional corn wet-milling: 1-kg procedures
1999
Du, L. | Rausch, K.D. | Yang, P. | Uriyo, E.A.M. | Small, A.D. | Tumbleson, M.E. | Faubion, J.M. | Eckhoff, S.R.
An alkali corn wet-milling process was developed to evaluate the process as a method to produce high purity corn starch and coproducts with added value. Using a single hybrid (R1064 x LH59), the effects of alkali concentration (0.18-0.82% NaOH), time (29-61 min), and temperature (36-75 degrees C) were investigated. Starch yield was not affected by steep time or temperature. Starch yield was optimal at 65.2% using 0.5% alkali. Increasing the concentration of alkali to 0.82% or decreasing it to 0.18% caused a decrease in starch yield of 8-10 percentage points. Other wet-milling products (fiber, germ, and gluten) also were affected. Steep conditions of 0.5% NaOH, 60 min, and 45 degrees C gave optimal starch yield. Comparisons between alkali and sulfur dioxide wet-milling processes, using 1-kg sample size, were performed on 10 commercial yellow dent corn hybrids. The alkali process averaged 1.7 percentage points more starch than the sulfur dioxide process. Each hybrid had a higher starch yield when wet-milled with the alkali method. Alkali wet-milling produced pure corn starch with <0.30% protein (db).
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