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. 2013:2013:243412.
doi: 10.1155/2013/243412. Epub 2013 Dec 24.

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

Brunson Dominque  1 , Peter N Gichuhi  1 , Vijay Rangari  2 , Adelia C Bovell-Benjamin  1
Affiliations

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

Brunson Dominque et al. Int J Food Sci. 2013.

Abstract

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 7.6 ± 0.4%. The SPSS had significantly higher (P < 0.05) 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.

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Figures

Figure 1
Figure 1
Sugar profile of sweet potato starch, pancake, and ginger syrups.
Figure 2
Figure 2
Viscosity versus shear rate for the SPSS, pancake, and ginger syrups at (a) Day 0, (b) Day 30, (c) Day 49, and (d) Day 70.
Figure 3
Figure 3
Flow curves for sweet potato starch, pancake, and ginger syrups.
Figure 4
Figure 4
Water loss temperature of sweet potato, pancake and ginger syrups on Day 0 of storage.
See this image and copyright information in PMC

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