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Effect of alternative milling techniques on the yield and composition of corn germ oil and corn fiber
oil. V. SINGH (1,2), R. A. Moreau (2), K. B. Hicks (2), and Steven R. Eckhoff (1). (1) University of
Illinois at Urbana-Champaign, Urbana, IL 61801; (2) Eastern Regional Research Center, USDA, ARS,
Wyndmoor, PA 19038.
The effects of alternative corn wet-milling (Intermittent Milling and
Dynamic Steeping (IMDS), Gaseous SO(2) and Alkali Wet-Milling) and dry grind ethanol (Quick Germ
and Quick Fiber with chemicals) production technologies were evaluated on the yield and phytosterol
composition (ferulate phytosterol esters, free phytosterols and fatty acyl phytosterol esters) of corn germ
and fiber oil and compared to the conventional wet-milling process. Small but statistically significant effects
were observed on the yield and composition of corn germ and fiber oil with these alternative milling
technologies. The results showed that the germ and fiber fractions from two of the alternative wet-milling
technologies (the gaseous SO(2) and the IMDS) had, for almost all of the individual phytosterol
compounds, either comparable or signficantly higher yields compared to the conventional wet-milling
process. Also, both of the modified dry grind ethanol processes (the quick germ and quick fiber) with
chemicals (SO(2) and lactic acid) can be used as a new source of corn germ and fiber and can produce oils
with high yields of phytosterols. The alkali wet-milling process showed significantly lower yields of
phytosterols compounds in germ but showed significantly higher yield of free phytosterols, fatty acyl
phytosterol esters and total phytosterols in the fiber fraction.
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