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Construction of OSA-starch and caffeic acid composite system driven by high pressure homogenization: Multiscale
Ran-Ran Deng1, Ran Feng1, Ran Meng1
1Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, 193 Tunxi Road, Hefei, Anhui 230009, PR China; School of Food and Biological Engineering, Hefei University of Technology, 193 Tunxi Road, Hefei, Anhui 230009, PR China.
Abstract:
The effect of modification treatments on the structure and function of starch-polyphenol complexes has become a hot research topic. Therefore, this study aims to systematically investigate the structural reorganization and digestibility modulation of octenyl succinic anhydride modified rice starch (OR)-caffeic acid complexes (ORCA) under gradient high pressure homogenization (HPH) pressures (50, 80, and 110 MPa). HPH promoted the interaction between starch and CA compared to the non-HPH-treated samples. Among the HPH-treated samples, ORCA exhibited more complete granular structures and higher thermal stability (311.65 °C) than the rice starch-CA complexes (RCA). Dual modification significantly improved resistant starch content. The underlying mechanism by which ORCA and HPH treatments regulated starch digestibility involved HPH-driven structural reorganization, which promoted the formation of a new densely ordered structure and crystalline barrier. This study provides theoretical support for the design of starch-based functional foods with anti-digestive properties.
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