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United States Department of Agriculture

Agricultural Research Service

Title: Effects of Supercritical Fluid Extraction on the Pasting Properties of Cornstarch

Authors
item Peterson, Steven
item Fanta, George
item Eller, Fred
item Felker, Frederick

Submitted to: American Association of Cereal Chemists Meetings
Publication Type: Abstract Only
Publication Acceptance Date: September 14, 2005
Publication Date: September 14, 2005
Citation: Peterson, S.C., Fanta, G.F., Eller, F.J., Felker, F.C. 2005. Effects of supercritical fluid extraction on the pasting properties of cornstarch [abstract]. American Association of Cereal Chemists Meetings. Paper No. 0-24.

Technical Abstract: Lipid extraction using supercritical fluid/accelerated solvent methods, which uses less toxic solvents and is faster than more traditional methods of extraction, has been growing in research popularity. The presence or absence of native lipids in cornstarch has been known to change the pasting and retrogradation properties of the starch. In this study, native lipids in food-grade cornstarch were extracted by either reflux (using a solution of 75 percent n-propanol and 25 percent water) or by supercritical fluid/accelerated solvent methods. The pasting curve of the cornstarch was then used to observe differences between the two lipid extraction methods. Changes in the peak viscosity of the pasting curve between the reflux extraction cornstarch and the supercritical fluid extracted cornstarch were significant (approximately a factor of four), consequently resulting in lower set-back values for the reflux-extracted cornstarch. The lipid extracts from the two methods were also analyzed as fatty acid methyl esters using gas chromatography in order to observe any differences in lipid type or amount extracted.

Last Modified: 12/18/2014
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