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United States Department of Agriculture

Agricultural Research Service

Title: Application of Time-Domain Nuclear Magnetic Resonance to Quantify Oil Content in Starch-Oil Composites Prepared by Excess Steam Jet-Cooking

item Kenar, James
item Singh, Mukti

Submitted to: American Association of Cereal Chemists Meetings
Publication Type: Abstract Only
Publication Acceptance Date: May 18, 2006
Publication Date: September 17, 2006
Citation: Kenar, J.A., Singh, M. 2006. Application of time-domain nuclear magnetic resonance to quantify oil content in starch-oil composites prepared by excess steam jet-cooking [abstract]. American Association of Cereal Chemists Meetings. p. 183.

Technical Abstract: Stable dispersions of starch-oil composites can be obtained by excess steam jet-cooking aqueous slurries of starch and hydrophobic materials such as vegetable oils. These composites consist of uniformly suspended starch-coated oil droplets (1-10 micrometers in diameter). These composites can contain up to 50 wt % oil depending upon the formulation. The composites are routinely drum dried and then utilized in a broad range of food and non-food applications. The quality and performance of these composites in end applications can depend, in part, on precise determination of the oil and moisture content within the starch-oil composites. Because some oil in the composite is tightly bound to the starch, a labor intensive process based on starch hydrolysis (chemical or enzymatic) followed by solvent extraction is currently utilized to determine the total oil content. The application of Time-Domain Nuclear Magnetic Resonance (TD-NMR) to quantify oil and moisture within these starch-oil composites represents a fast, accurate, and non-invasive technique based on NMR relaxation properties. This work examined TD-NMR to expediently quantify both the oil and water content in starch-oil composites and validate this method relative to conventional extraction procedures. The TD-NMR methodology was subsequently utilized to quantify oil and water content in low fat cookies prepared from starch-oil composites. Results of this study provided a basis upon which TD-NMR techniques can be applied to investigate starch-oil composites and improve the utilization and performance of these composites in various end applications.

Last Modified: 4/18/2015