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자료유형
학술저널
저자정보
Hyundo Lee (Dongguk University-Seoul) Byoungseung Yoo (Dongguk University-Seoul)
저널정보
한국식품영양과학회 Preventive Nutrition and Food Science Preventive Nutrition and Food Science Vol.24 No.4
발행연도
2019.12
수록면
478 - 484 (7page)
DOI
10.3746/pnf.2019.24.4.478

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The effects of carboxymethyl cellulose (CMC) at different concentrations (0, 0.2, 0.4, and 0.6% w/w) on the rheological properties of waxy rice starch (WRS) pastes were evaluated under both steady and dynamic shear conditions. The flow properties of WRS-CMC mixtures were determined from the rheological parameters of power law and Casson models. All samples demonstrated a clear trend of shear-thinning behavior (n=0.33∼0.34), with a marginal difference shown between n values. The addition of CMC to WRS increased the apparent viscosity (η<SUB>a,100</SUB>), consistency index, and Casson yield stress values. The dynamic moduli [storage modulus (G’), loss modulus (G”), and dynamic viscosity (η*)] and ratio of G”/G’ values of WRS-CMC mixtures also increased with an increase in CMC concentration; the higher dynamic rheological properties observed at higher CMC concentrations may be attributed to an increase in the viscoelasticity of the continuous phase in the starch-gum mixture system. Dependence of η<SUB>a,100</SUB> on temperature followed the Arrhenius model for all samples. The Cox-Merz rule was not applicable to WRS-CMC pastes with different CMC concentrations, demonstrating that there was a deviation between η* and steady shear viscosities for all samples. Therefore, the synergistic effect of CMC on the rheological properties of WRS pastes appeared to be the result of coacervation.

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ABSTRACT
INTRODUCTION
MATERIALS AND METHODS
RESULTS AND DISCUSSION
REFERENCES

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