Cereal Chem. 73 (2):185-188  |  VIEW ARTICLE

Carbohydrates

Composition and Oil-Retaining Capacity of Jet-Cooked Starch-Oil Composites.

C. A. Knutson, K. Eskins, and G. F. Fanta (1). (1) Phytoproducts and Plant Polymer Research Units, National Center for Agricultural Utilization Research, ARS, USDA, 1815 N. University, Peoria, IL 61604. The mention of firm names or trade products does not imply that they are endorsed or recommended by the USDA over other firms or similar products not mentioned. Accepted December 11, 1995. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. American Association of Cereal Chemists, Inc., 1996. 

Jet-cooked starch-oil composites were evaluated to determine whether the cooking procedure resulted in alteration of the chemical composition of either the starch or oil. Although these composites, both in dry form and in aqueous solution, were highly resistant to separation of starch and oil, there was no evidence of covalent bonding of the components, and composition of the starch moiety was unchanged. Extraction of oil from dried composites with a variety of organic solvents was not effective for complete recovery of oil; an amount of oil representing approximately 5% of the starting weight of the composite could be recovered only after hydrolytic degradation of the starch. Extraction of oil from aqueous solutions of composites was also inefficient for complete oil recovery. The extent of extraction varied with concentration of both starch and oil. Typically, extraction repeated eight times with hexane recovered less than 80% of the oil from solutions with starch concentrations above 0.6%.