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United States Department of Agriculture

Agricultural Research Service

Title: Quantitation of the Lipid Content in Fantesk by Pulsed Nmr

Authors
item Erhan, Selim
item Eskins, Kenneth
item Krygsman, Peter - BRUKER INSTRUMENTS

Submitted to: International News on Fats, Oils and Related Materials
Publication Type: Proceedings
Publication Acceptance Date: November 25, 1997
Publication Date: N/A

Technical Abstract: Fantesk, a very stable emulsion of oil, water, and starch, has numerous areas of application ranging from food to adhesives, coatings, lubricants, and pharmaceuticals. It can be used to deliver it's lipid content to a desired location or act as an emulsifier and a lubricating agent. During the production of Fantesk there is a certain amount of starch and oil that is lost in the equipment before the jet-cooking process. This loss depend on the type and size of the jet cooker and the operator. Therefore, in either type of application, it is necessary to have a rapid, reproducible method to quantitate the amount of lipid in the composite, and pulsed NMR spectroscopy was used to obtain this information. This method provides a rapid alternative to the long, laborious, traditional methods of analysis and is widely used in industry to determine the oil and fat content of seeds and food products. NMR measurements were done on an NMS-series Minispec at 10 MHZ **1H frequency equipped with an absolute probehead designed specifically for measuring for liquid oil in the presence of other solids. A calibration line was constructed by measuring the NMR signal of four standards made up of 100% corn starch and added soybean oil. The calibration results were excellent. The correlation coefficient was greater than 0.999 between the Calculated % Oil of the samples and the weight- normalized NMR signal due to the liquid-like fraction of the sample. The total oil content of Fantesk was also measured by hydrolyzing the starch with alpha-amylase, then extracting the liberated oil with hexane. The pulsed NMR values are much closer to the calculated values. From these results we conclude NMR is able to measure the % Oil accurately as long as the corresponding starch base is used to construct the calibration line.

Last Modified: 11/28/2014
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