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International Journal of Food Science
Volume 2013, Article ID 243412, 8 pages
Research Article

Sugar Profile, Mineral Content, and Rheological and Thermal Properties of an Isomerized Sweet Potato Starch Syrup

1Department of Food and Nutritional Sciences, Tuskegee University, 300-A Campbell Hall, Tuskegee, AL 36088, USA
2Center for Advanced Material Science Testing, Tuskegee University, Tuskegee, AL 36088, USA

Received 10 July 2013; Accepted 21 November 2013

Academic Editor: Alejandro Castillo

Copyright © 2013 Brunson Dominque et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Currently, corn is used to produce more than 85% of the world’s high fructose syrup (HFS). There is a search for alternative HFS substrates because of increased food demand and shrinking economies, especially in the developing world. The sweet potato is a feasible, alternative raw material. This study isomerized a high glucose sweet potato starch syrup (SPSS) and determined its sugar profile, mineral content, and rheological and thermal properties. Rheological and thermal properties were measured using a rheometer and DSC, respectively. Sweet potato starch was hydrolyzed to syrup with a mean fructose content of %. The SPSS had significantly higher ( ) mineral content when compared to commercial ginger and pancake syrups. During 70 days of storage, the SPSS acted as a non-Newtonian, shear-thinning liquid in which the viscosity decreased as shear stress increased. Water loss temperature of the SPSS continually decreased during storage, while pancake and ginger syrups’ peak water loss temperature decreased initially and then increased. Further and more detailed studies should be designed to further enhance the fructose content of the syrup and observe its stability beyond 70 days. The SPSS has the potential to be used in human food systems in space and on Earth.