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Mixed Culture Fermentations To Improve Nutritional Value of Corn Meal 1
M L Fields1, A Al-Shoshan1, Y Poosiri1
1Department of Food Science and Nutrition, University of Missouri-Columbia, Columbia, Missouri 65211.
Abstract:
One-step fermentation involving two microorganisms inoculated at the same time and two-step fermentations involving two inoculations of different microbes at different times were used to enrich corn meal. Starch in corn meal was first hydrolyzed by amylases of B. stearothermophilus , E. fibuligera or A. oryzae followed by the growth of C. utilis . The combination of E. fibuligera and C. utilis produced a significant (P<0.05) increase in lysine, methionine, tryptophan. The relative nutritive value (%), which reflected the amino acid balance, increased significantly (P<0.05) with this sequence of microorganisms. Niacin, riboflavin, and thiamin increased significantly (P<0.05) when mixed cultures of A. oryzae and E. fibuligera in combination with C. utilis were employed. When E. fibuligera alone was grown, no significant change was observed in thiamin content but significant increases occurred in niacin and riboflavin. A. oryzae by itself produced significant (P<0.05) changes in niacin, riboflavin and thiamin.
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