|
KMID : 0380620080400020184
|
|
Korean Journal of Food Science and Technology
2008 Volume.40 No. 2 p.184 ~ p.189
|
|
|
Engineering/Processing/Sensory Evaluation : Rheological Properties of Sweet Potato Starch-sucrose Composite
|
|
Cho Sun-A
Yoo Byoung-Seung
|
|
|
Abstract
|
|
|
|
Effects of sucrose at different concentrations (0, 10, 20, and 30%, w/w) on steady and dynamic shear rheological properties of sweet potato starch (SPS) paste (5%, w/w) were investigated. The steady shear rheological properties of SPS-sucrose composites were determined from rheological parameters based on power law and Casson flow models. At 25℃ all the samples showed pseudoplastic and thixoropic behavior with high yield stress. Consistence index (K), apparent viscosity (ηa,100), and yield stress (σoc) values of SPS-sucrose composites decreased with increasing sucrose concentration from 10% to 30%. The decrease of swelling power was observed at higher sucrose concentration (>20%) and the low swelling power yielded a lower K, ηa,100, and σoc values. In temperature range of 25-70℃, Arrhenius equation adequately assessed variation with temperature. Oscillatory test data showed weak gel-like behavior. Magnitudes of storage (G``) and loss (G") moduli increased with an increase in sucrose concentration and frequency. The SPS-sucrose composite at 30% concentration closely followed the Cox-Merz superposition rule.
|
|
|
KEYWORD
|
|
|
sweet potato starch, rheology, sucrose, storage modulus, Cox-Merz rule
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|