Author/Authors :
Salma, H. A. University of Khartoum - Faculty of Agriculture - Department of Food Science and Technology, Sudan , Nahid, A. A. University of Juba - Faculty of Applied Sciences - Department of Food Science, Sudan , ElShazali, A. M. University of Khartoum - Faculty of Agriculture - Department of Food Science and Technology, Sudan , Isam, A. M. A. Tottori University - United Graduate School of Agricultural Sciences, Japan , Elfadil, E. B. University of Khartoum - Faculty of Agriculture - Department of Food Science and Technology, Sudan
Abstract :
The effect of cross linking of the protein isolates of three legumes with the microbial enzyme transglutaminase (EC 2.3.2.13) on the functional properties at different NaCl concentration was studied. The reduction in the total free amino groups (OD340) of the polymerized protein showed that TGase treatment cross-linking the protein subunit of each legume. The solubility of the protein polymer of each legume was greatly improved at high concentration of NaCl. At 1.2 M NaCl the solubility of the native legumes protein was significantly decreased but after polymerization slightly improved. Cross linked proteins were less turbid on heating to higher temperature as compared to native proteins and the temperature at which the protein turns turbid also increased in the polymerized proteins. The emulsifying and foaming properties of the protein polymer were greatly improved at all concentrations of NaCl for all legumes.
Keywords :
Transglutaminase , functional properties , NaCl , legumes , protein isolate
