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Qin, Xin-Sheng; Luo, Shui-Zhong; Cai, Jing; Zhong, Xi-Yang; Jiang, Shao-Tong; Zhao, Yan-Yan; Zheng, Zhi
Ultrasonics sonochemistry, July 2016, 2016-Jul, 2016-07-00, 20160701, Letnik: 31Journal Article
•Soy protein isolate (SPI) and wheat gluten (WG) exhibit poor individual gelation.•Ultrasonic pretreatment improved MTGase-induced SPI/WG mixture gelation properties.•Ultrasonic treatment reduced the particle size of SPI/WG molecules.•Ultrasonic treatment increased SPI/WG gel water holding capability and gel strength.•SPI/WG gel had denser, more homogeneous protein networks after ultrasonic treatment. Soy protein isolate (SPI) and wheat gluten (WG) are widely used in commercial food applications in Asia for their nutritional value and functional properties. However, individually each exhibits poor gelation. In this study, we examined the microbial transglutaminase (MTGase)-induced gelation properties of SPI and WG mixtures with high intensity ultrasonic pretreatment. Ultrasonic treatment reduced the particle size of SPI/WG molecules, which led to improvements in surface hydrophobicity (Ho) and free sulfhydryl (SH) group content. However, MTGase crosslinking facilitated the formation of disulfide bonds, markedly decreasing the content of free SH groups. Ultrasonic treatment improved the gel strength, water holding capacity, and storage modulus and resulted in denser and more homogeneous networks of MTGase-induced SPI/WG gels. In addition, ultrasonic treatment changed the secondary structure of the gel samples as determined by Fourier transform infrared spectroscopic analysis, with a reduction in α-helices and β-turns and an increase in β-sheets and random coils. Thus, ultrasound is useful in facilitating the gelation properties of MTGase-induced SPI/WG gels and might expand their utilization in the food protein gelation industry.
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