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Niu, Haili; Xia, Xiufang; Wang, Chao; Kong, Baohua; Liu, Qian
Food chemistry, 03/2018, Volume: 242Journal Article
•Soy protein isolates were modified by an acidic pH treatment with mild heating.•Modified soy protein isolates were added to myofibrillar protein solutions.•Thermal stability and gel molecular forces of myofibrillar protein were improved.•Mixed gels displayed a more continuous and homogeneous gel network. Thermal stability and gel quality of myofibrillar protein were evaluated with regard to the addition of native soy protein isolates (SPI) and SPI subjected to acidic pH and mild heating (modified SPI). Compared with the control, the addition of modified SPI increased the compression force of the protein gel and decreased water loss (P<0.05). Differential scanning calorimetry results showed that an addition of 0.75% native SPI decreased the first transition temperature (P<0.05), and addition of 0.5% and 0.75% modified SPI exhibited no appreciable changes on it (P>0.05), indicating that a higher concentration of modified SPI would not damage the protein thermal stability. Moreover, the addition of modified SPI enhanced hydrogen bonding and disulphide linkages. Atomic force microscopy analysis revealed that the addition of modified SPI decreased the roughness of the mixed myofibrillar protein gels. Overall, modified SPI has the potential to improve myofibrillar protein gel texture and water holding capacity.
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