Home Physical Sciences Study of Starch Gelatinization in a Flow Field Using Simultaneous Rheometric Data Collection and Microscopic Observation
Article
Licensed
Unlicensed Requires Authentication

Study of Starch Gelatinization in a Flow Field Using Simultaneous Rheometric Data Collection and Microscopic Observation

  • L. Yu , T. Kealy and P. Chen
Published/Copyright: March 26, 2013
Become an author with De Gruyter Brill
Submit Manuscript Author Information
International Polymer Processing
From the journal International Polymer Processing Volume 21 Issue 3

Abstract

Gelatinisation of aqueous cornstarch dispersions with different amylose/amylopectin ratios were studied with respect to their response to the simultaneous application of thermal and mechanical stresses. The study was conducted using a combined controlled stress (CS) rheometer and microscope with camera, allowing variations of viscosity and microstructure to be recorded concurrently. The microscopic images were recorded by the camera, one image for each rheological data point. It is the first time a direct relationship between viscosity and physical variation of starch granules in dispersion has been established and directly optically observed for starch gelatinisation in the presence of an applied shear field. It was found that there are two steps for starch gelatinisation under these conditions with regard to the physical transition of the starch granules: (1) starch swelling and gradual dissolving and leaching of starch components; (2) rapid dissolution of a high proportion of the granule. In the first step the viscosity increaseed gradually, as the starch granule was slowly dissolved and materials were leached into the water carrier. The granules became almost transparent in the presence of the applied thermal and mechanical fields and dimensional changes in the starch granules (swelling) during the latter stages of gelatinisation can not be clearly observed. In the second step, the starch granule disappeared in a short time and viscosity of the aqueous material increased sharply. The gelatinisation temperature under shear stress, as measured by the CS rheometer/microscope combination is lower than that measured by Differential Scanning Calorimetry (DSC) under shear-less conditions.

∗ Mail address: L. Yu, Commonwealth Scientific and Industrial Research Organization, Manufacturing and Infrastructure Technology, Melbourne, Australia. E-mail:

References

1 1 Whistler, R. L., Bemiller, J. N., Paschall, E. F.: Starch: Chemistry and Technology. Academic Press, London (1984)Search in Google Scholar

2 2 Zobel, H. F.: Starch40, p. 44 (1988)10.1002/star.19880400203Search in Google Scholar

3 3 Keetels, C. J. A. M., Oostergetel, G. Y., van Vliet, T.: Carbohydrate Polymer, 30, p. 61 (1996)10.1016/S0144-8617(96)00057-4Search in Google Scholar

4 4 Zobel, H. F. in Starch: Chemistry and Technology. WhistlerR. L. etal. (Eds.), Academic Press, London (1984)Search in Google Scholar

5 5 Lelievre, J.: J. Polym. Sci. 28, p. 293 (1973)10.1037/h0020389Search in Google Scholar

6 6 Atwell, W. A., Hood, L. K., Lineback, D. R., Varriano-Marston, E., Zobel, H. F.: Cereal Foods World33, p. 306 (1988)Search in Google Scholar

7 7 Sullivan, J. W., Johnson, J. A.: Cereal Chem. 41, p. 73 (1964)Search in Google Scholar

8 8 Roberts, R. L., Potter, E. L., Kester, E. B., Keneaster, K. K.: Cereal Chem., 31, p. 121 (1954)Search in Google Scholar

9 9 Olkku, J., Rha, C.: Food Chemistry3, p. 293 (1978)10.1016/0308-8146(78)90037-7Search in Google Scholar

10 10 Ziegler, G. R., Thompson, D. B., Casasnovas, J.: Cereal Chemistry70, p. 247 (1993)Search in Google Scholar

11 11 Yeh, A., Li, J.: J. Cereal Science23, p. 277 (1996)10.1006/jcrs.1996.0028Search in Google Scholar

12 12 Ghlasi, K., Hoseney, R. C., Varriano-Marston, E.: Cereal Chemistry, 59, p. 258 (1982)Search in Google Scholar

13 13 Teste, R. F., Morrison, W. R.: Cereal Chemistry69, p. 654 (1992)Search in Google Scholar

14 14 Yu, L., Christie, G.: Carbohydrate Polymers46, p. 79 (2001)10.1016/S0144-8617(00)00301-5Search in Google Scholar

15 15 Scion Corporation, Beta 4.0.2 Release, 2000, www.scioncorp.comSearch in Google Scholar
Received: 2005-07-27
Accepted: 2006-03-09
Published Online: 2013-03-26
Published in Print: 2006-07-01

© 2006, Hanser Publishers, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Regular Contributed Articles
  4. New Multicomponent Compatibilization System for Polyolefin/Polystyrene Blends
  5. Preparation and Characterization of HMW PA 6 via Anionic Polymerization of ∊-Caprolactam by Using a Mixture of Di- and Tri-functional Chain Initiators
  6. Polymer Processing Extrusion Instabilities and Methods for their Elimination or Minimisation
  7. Microcellular Wood Fibre Reinforced PP Composites
  8. Effects of Take-up Speed of Melt Spinning on the Structure and Mechanical Propertiesof Maximally Laser Drawn PA9-T Fibers
  9. Description of the Pressure/Throughput Behavior of a Single-screw Plasticating Unit in Consideration of Wall Slippage Effects for Non-Newtonian Material and 1-D flow
  10. Study of Starch Gelatinization in a Flow Field Using Simultaneous Rheometric Data Collection and Microscopic Observation
  11. Analysis of the Residual Stresses in the Process of Nanoimprint Lithography
  12. The Reactive Extrusion of Thermoplastic Polyurethane and the Effect of the Depolymerization Reaction
  13. Simulation of Core Deflection in Powder Injection Molding
  14. Experimental Investigation of the Cooling Flow in the Film Blowing Process
  15. Study of the Compatibilizer Effect on Blends Prepared from Waste Poly(ethylene-terephthalate) and High Density Polyethylene
  16. PPS News
  17. PPS News
  18. Seikei-Kakou Abstracts
  19. Seikei-Kakou Abstracts
https://doi.org/10.3139/217.0098

Articles in the same Issue

  1. Contents
  2. Contents
  3. Regular Contributed Articles
  4. New Multicomponent Compatibilization System for Polyolefin/Polystyrene Blends
  5. Preparation and Characterization of HMW PA 6 via Anionic Polymerization of ∊-Caprolactam by Using a Mixture of Di- and Tri-functional Chain Initiators
  6. Polymer Processing Extrusion Instabilities and Methods for their Elimination or Minimisation
  7. Microcellular Wood Fibre Reinforced PP Composites
  8. Effects of Take-up Speed of Melt Spinning on the Structure and Mechanical Propertiesof Maximally Laser Drawn PA9-T Fibers
  9. Description of the Pressure/Throughput Behavior of a Single-screw Plasticating Unit in Consideration of Wall Slippage Effects for Non-Newtonian Material and 1-D flow
  10. Study of Starch Gelatinization in a Flow Field Using Simultaneous Rheometric Data Collection and Microscopic Observation
  11. Analysis of the Residual Stresses in the Process of Nanoimprint Lithography
  12. The Reactive Extrusion of Thermoplastic Polyurethane and the Effect of the Depolymerization Reaction
  13. Simulation of Core Deflection in Powder Injection Molding
  14. Experimental Investigation of the Cooling Flow in the Film Blowing Process
  15. Study of the Compatibilizer Effect on Blends Prepared from Waste Poly(ethylene-terephthalate) and High Density Polyethylene
  16. PPS News
  17. PPS News
  18. Seikei-Kakou Abstracts
  19. Seikei-Kakou Abstracts
Sign up now to receive a 20% welcome discount
Institutional Access
How does access work?
Have an idea on how to improve our website?
Please write us.
© 2026 De Gruyter Brill
Downloaded on 9.2.2026 from https://www.degruyterbrill.com/document/doi/10.3139/217.0098/html
Scroll to top button