36D-16 |
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C.-T. KIM, H.-S. Chun, C.-J. Kim, Y.-J. Cho, and B.-Y. Chun. Biosystems Engineering Team, Korea Food Research Institute, San 46-1, Baekhyundong, Bundangku, Songnam, 463-420, South Korea In yukwa production, the steeping period of waxy rice in water is regarded as an important step, because of water, time consumption and wastewater treatment. Additionally, the steeping period of waxy rice is known to be related to texture and volume expansion of a snack such as yukwa. The High-Pressure Microfluidization (HPM) can perform specific functions such as shear force, impact and cavitation, according to the collision of the particles within the stream. The purpose of this study was to investigate the effect of the process parameters (starch concentration, pressure and number of passes) on the physicochemical properties of waxy rice starch by use of HPM. The slurry of waxy rice starch at concentration of 10, 20, and 30% was treated under 15,000; 20,000; and 25,000 psi through the microfluidizer with recycling pass. The characteristic properties evaluated were starch damage, solubility, gelatinization, swelling behavior, paste viscosity, viscoelastic properties, DSC and microstructure. Starch damage showed a range of 3 to 12 % depending on the process parameters. The degree of the gelatinization enthalpy decreased with increasing pressure and concentration of starch slurry, and this enthalpy decrease is good agreement with the microstructural results. The intrinsic viscosity exhibited a good correlation with both pressure and concentration of starch slurry. The sensory evaluation showed that hardness and crispness tended to be similar to that of control in yukwa product. These results indicate that the HPM cause structural changes on waxy rice starch and modifies the starch functionality also attribute to quality improvement of yukwa. From a practical point of view it is important that the HPM could be a substitute for steeping process in yukwa production.
Session 36D, Food Engineering: Rheology
2005 IFT Annual Meeting, July 15-20 - New Orleans, Louisiana |