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Improving the structural and functional properties of soy protein amyloid fibrils through ohmic heating
Jianling Feng1, Songwei Yu1, Dan Feng1
1College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang, 150030, China.
Abstract:
The purpose of this study was to explore the effect of ohmic heating (OH) on the formation of soy amyloid fibrils (SAF) by self-assembly of soy protein isolate (SPI). Compared with traditional heating methods, OH technology can directly act on proteins, but the regulation of different electric field intensity (EFI) on fibrillation was still unclear. Therefore, this study induced SPI to form SAF by regulating the EFI of OH, and analyzed the conversion rate, spatial structure and functional characteristics. Results showed that appropriate EFI can accelerate fibrillation and improve functional properties. When the EFI was 7 V/cm, SAF-OH-7 had the fastest formation rate of fibril, the highest conversion rate (53.13%), β-sheet content (59.22%), solubility (32.01 mg/mL), emulsion property and thermal stability (166.41 °C). This study revealed the regulatory mechanism and advantages of OH in soy protein fibrillation for the first time, and provided a new strategy for plant protein fibrillation.
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