Home Physical Sciences Salt and Acid-Induced Soft Tofu-Type Gels: Rheology, Structure and Fractal Analysis of Viscoelastic Properties as a Function of Coagulant Concentration
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Salt and Acid-Induced Soft Tofu-Type Gels: Rheology, Structure and Fractal Analysis of Viscoelastic Properties as a Function of Coagulant Concentration

  • Murekatete Nicole , Zhang Caimeng , Karangwa Eric and Hua Yufei EMAIL logo
Published/Copyright: September 5, 2014

Abstract

The coagulant concentration dependence on the rheological properties of acid and salt-induced soft tofu-type gels formed with heated soy protein solutions was investigated. All gels showed a clear gel-like behavior, with acid-induced gels having the highest storage modulus (G′). Increase in coagulant concentration resulted in higher G′ and shorter gelation time (tgel). The dependence of tgel on the coagulant concentration could be scaled with a power law model with R2 varying between 0.9535 and 0.9787. Also the dynamic moduli change over angular frequency fitted well the models: GG0ωnand G′′G0ωn. The increase in shear deformation at fracture and shear stress yielding was directly proportional to the increase in coagulant concentration. Both gels were found in the transition regime with varying protein concentration, when experimental data were scaled with a fractal model. Salt-induced gels had more uniform network pore size, finer and smoother surface texture than acid-induced gels. Dynamic moduli analysis of the gels was significantly affected by coagulant type and concentration (p<0.05).

Acknowledgments

The work was financially supported by The National Natural Science Foundation of China (No. 21276107), The 863 Program (Hi-tech research and development program of China) (No. 2013AA102204-3) and The National Great Project of Scientific and Technical Supporting Programs funded by the Ministry of Science and Technology of China during the 12th 5-year plan (No. 2012BAD34B04-1).

Abbreviations

C

protein concentration (%)

d

Euclidean dimension (=3)

df

fractal dimensionality

G′

storage modulus

G″

loss modulus

G

storage modulus at infinite time

n

scaling exponent in power law relationship of γ0 and C

m

scaling exponent in power law relationship of G′ and C

t

time

x

fractal dimensionality of the backbones (1≤x <df)

α

microscopic elastic constant in the model of Wu and Morbidelli (0≤α≤1)

β

exponent in model of Wu and Morbidelli which depends on α and x

δ

phase angle

γ0

critical strain; limit of linearity

σfr

fracture stress

γfr

shear deformation at fracture

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Published Online: 2014-9-5
Published in Print: 2014-12-1

©2014 by De Gruyter

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