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1 International Journal of Applied Mechanics and Engineering

1 2005

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Rheological and AFM characteristic of hydrolysates produced by limited enzymic hydrolysis of extruded soy protein concentrate

Witczak M., Ptaszek A., Surówka K., Żmudziński D.

International Journal of Applied Mechanics and Engineering

2005

Vol. 10, no spec

201-206

Structure and selected rheological properties of water suspensions of hydrolysates produced by limited enzymic hydrolysis of extruded soy protein concentrate were analyzed. The following enzymes were used for hydrolysis: Neutrase, Protamex and papain. The rheological measurements were performed using a rotationally Rheometer RS 150 (Haake, Germany) in the cone-plate system. Flow curves with controlled shear rate were determined. The shear rate varied within a range 1-100s-1. Time dependent curves for selected shear rates (1-100s-1) were also obtained. Surface of dispersion was studied with AFM Quesant "Nomad" model. The scanning was performed in the high resolution non contact mode. The rheological characteristics have been studied using a Cheng and Evans structural theory. The parameters of multiple exponential-type flow were estimated on the base of experimental data. These investigations have shown a significant influence of the enzyme used upon rheological properties of hydrolysis products' suspensions.