Effect of gums on the rheological characteristics and microstructure of acid-induced SPI-gum mixed gels.

Autor: Chang YY; College of Food Science and Nutritional Engineering, Beijing Key Laboratory of Functional Food from Plant Resources, China Agricultural University, P.O. Box 50, 17 Qinghua Donglu, Beijing 100083, China., Li D; College of Engineering, National Energy R&D Center for Non-food Biomass, China Agricultural University, Beijing, China., Wang LJ; College of Food Science and Nutritional Engineering, Beijing Key Laboratory of Functional Food from Plant Resources, China Agricultural University, P.O. Box 50, 17 Qinghua Donglu, Beijing 100083, China. Electronic address: wlj@cau.edu.cn., Bi CH; College of Engineering, National Energy R&D Center for Non-food Biomass, China Agricultural University, Beijing, China., Adhikari B; School of Applied Sciences, RMIT University, City Campus, Melbourne, VIC 3001, Australia.
Jazyk: angličtina
Zdroj: Carbohydrate polymers [Carbohydr Polym] 2014 Aug 08; Vol. 108, pp. 183-91. Date of Electronic Publication: 2014 Mar 12.
DOI: 10.1016/j.carbpol.2014.02.089
Abstrakt: The effect of addition of xanthan gum (XG) and guar gum (GG) on the rheological properties and microstructure of glucono-δ-lactone induced soy protein isolate (SPI)-XG gels and SPI-GG gels was investigated using steady and dynamic rheological tests, creep-recovery and confocal laser scanning microscopy (CLSM). Results showed that the apparent viscosity of SPI-gum (XG, GG) mixed solutions increased with the increase in the gum (XG, GG) concentration. The storage (G') and loss (G″) moduli of SPI-gum (XG, GG) mixed gels increased in the presence and increase in the gum (XG, GG) concentration. The Burger's model fitted the creep recovery data well (R(2)>0.919) and showed that both the instantaneous and equilibrium (retarded) elastic components of this model increased with the increase in SPI and gum concentrations. The proportion occupied by gum in mixed gels was found to increase with the increase in the concentration of gums which increased the density of protein aggregates in the mixed gels.
(Copyright © 2014 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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