Food Science and Biotechnology

Korean Society of Food Science and Technology (한국식품과학회)
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Rheological Behavior of Sweet Potato Starch-Glucose Composites

  • Cho, Sun-A (Department of Food Science and Technology, Dongguk University) ;
  • Yoo, Byoung-Seung (Department of Food Science and Technology, Dongguk University)
  • Published : 2008.04.30
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Abstract

Rheological properties of sweet potato starch (SPS)-glucose composites (5%, w/w) at different concentrations (0, 10, 20, and 30%, w/w) of glucose were investigated in steady and dynamic shear. The steady shear rheological properties of SPS-glucose composites were determined from rheological parameters for power law and Casson flow models. At $25^{\circ}C$ all the samples showed a pronounced shear-thinning behaviors (n=0.29-0.37) with high Casson yield stress. In general, the presence of glucose resulted in the decrease in consistence index (K), apparent viscosity (${\eta}_{a,100}$), and yield stress (${\sigma}_{oc}$). Storage (G') and loss (G") moduli increased with an increase in frequency ($\omega$), while complex viscosity (${\eta}*$) decreased. Dynamic moduli (G', G", and ${\eta}*$) of the SPS-glucose composites at higher glucose concentrations (20 and 30%) were higher than those of the control (0% glucose) and also increased with increasing glucose concentration from 10 to 30%. The effect of glucose on steady and dynamic shear rheological properties of the SPS pastes appears to greatly depend on glucose concentration in the range of 10-30%.

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References

  1. Noel TR, Ring SG, Whittam MA. Physical properties of starch products: Structure and function. pp. 126-137. In: Food Colloids and Polymers: Stability and Mechanical Properties. Dickinson E, Walstra P (eds). Royal Society of Chemistry Special Publication, Cambridge, UK (1993)
  2. Yoo D, Yoo B. Rheology of rice starch-sucrose composites. Starch/ Starke 57: 254-261 (2005) https://doi.org/10.1002/star.200400356
  3. Chang YH, Lim ST, Yoo B. Dynamic rheology of corn starch-sugar composites. J. Food Eng. 64: 521-527 (2004) https://doi.org/10.1016/j.jfoodeng.2003.08.017
  4. Chang YH, Lim ST, Yoo B. Effect of sucrose on the rheological properties of corn starch. Korean J. Food Sci. Technol. 33: 700-705 (2001)
  5. Al-Malah KI, Azzam MOJ, Abu-Jdayil B. Effect of glucose concentration on the rheological properties of wheat-starch dispersions. Food Hydrocolloid 14: 491-496 (2000) https://doi.org/10.1016/S0268-005X(00)00029-1
  6. Gunaratne A, Ranaweera S, Corke H. Thermal, pasting, and gelling properties of wheat and potato starches in the presence of sucrose, glucose, glycerol, and hydroxypropyl ${\beta}-cyclodextrin$. Carbohyd. Polym. 70: 112-122 (2007)
  7. Ahmad FB, Williams PA. Effect of sugars on the thermal and rheological properties of sago starch. Biopolymers 50: 401-412 (1999) https://doi.org/10.1002/(SICI)1097-0282(19991005)50:4<401::AID-BIP6>3.0.CO;2-V
  8. Genovese DB, Acquarone VM, Youn KS, Rao MA. Influence of fructose and sucrose on small and large deformation rheological behaviour of heated amioca starch dispersions. Food Sci. Technol. Int. 10: 51-57 (2004) https://doi.org/10.1177/1082013204042073
  9. Schoch TJ. Methods in Carbohydrate Chemistry. Vol. 4. Whistler RL, Smith RJ, BeMiller JN (eds). Academic Press, London, UK. pp. 106-108 (1964)
  10. Evans IC, Haisman DR. Rheology of gelatinized starch suspension. J. Texture Stud. 10: 347-370 (1979) https://doi.org/10.1111/j.1745-4603.1980.tb00865.x
  11. Acquarone VM, Rao MA. Influence of sucrose on the rheology and granule size of cross-linked waxy maize starch dispersions heated at two temperatures. Carbohyd. Polym. 51: 451-458 (2003) https://doi.org/10.1016/S0144-8617(02)00217-5
  12. Rao MA, Okechukwu PE, Da Silva PM, Oliveira JC. Behavior of heated starch dispersions in excess water: Role of starch granule. Carbohyd. Polym. 33: 273-283 (2007) https://doi.org/10.1016/S0144-8617(97)00025-8
  13. Evageliou V, Richardson RK, Morris ER. Effect of sucrose, glucose, and fructose on gelation of oxidised starch. Carbohyd. Polym. 42: 261-272 (2000) https://doi.org/10.1016/S0144-8617(99)00158-7