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http://dx.doi.org/10.3746/jkfn.2011.40.5.738

Physicochemical and Rheological Evaluation of Rice-Whole Soybean Curds Prepared by Microbial Transglutaminase  

Jin, Ik-Hun (Dept. of Food Science and Technology and The Center for Traditional Microorganism Resources (TMR), Keimyung University)
Lee, Sam-Pin (Dept. of Food Science and Technology and The Center for Traditional Microorganism Resources (TMR), Keimyung University)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.40, no.5, 2011 , pp. 738-746 More about this Journal
Abstract
We manufactured rice-whole soybean curd by a microbial transglutaminase (MTGase) with a mixture of hydrolyzed rice and micronized whole soybean powder (MWSP) and analyzed its rheological properties, including texture, viscoelasticity, protein cross-linking, and surface structure. A 40% rice suspension digested with a Termamyl enzyme at $85^{\circ}C$ for 20 min showed a 9.0% reducing sugar and a consistency of $1.27\;Pa{\cdot}s^n$, resulting in a great reduction in consistency. A MWSP suspension with 22% solid content was transformed into a typical tofu texture. MWSP curd fortified with 7.5% rice showed enhanced texture properties, with a hardness of 639.6 dyne/$cm^2$, and a springiness of 0.96. In a MWSP suspension (18~22% w/v) treated with 5% MTGase, viscoelasticity increased dependently with MWSP concentration, and a 22% MWSP indicated a G' value of 5.1 Pa and a G'' value of 9.0 Pa. Furthermore, soybean proteins present in the 22% MWSP curd largely disappeared or formed polymers with a high molecular weight by MTGase reaction within 30 min. MWSP (22%) fortified with 7.5% rice showed similar polymerization patterns on SDS-PAGE. The surface structure of the rice-MWSP curds was more dense and homogeneous network due to the addition of hydrolyzed rice. However, the surface structure of all rice-MWSP curds became rough and showed a non-homogeneous network after cold storage.
Keywords
rice-whole soybean curd; microbial transglutaminase; termamyl; texture; dynamic viscoelasticity;
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