Changes in structure, digestion, and curcumin release properties of starch constructed by protein fibrils-OSA starch
Danni Jin1, Xiaoyan Wang2, Yihui Li1
1National Engineering Research Center of Rice and Byproduct Deep Processing, Hunan Key Laboratory of Processed Food For Special Medical Purpose, Hunan Key Laboratory of Forestry Edible Sources Safety and Processing, College of Food Science and Engineering, Central South University of Forestry and Technology, Changsha, Hunan 410004, China.
Abstract:
The influence of whey protein isolate fibrils (WPIF) on digestibility and release properties of octenyl succinic anhydride (OSA)-modified high amylose corn starch (OSA-HAS) was investigated in the aspects of WPIF-OSA-HAS interactions. Results showed that WPIF addition increased resistant starch content (31.52-42.85%) and encapsulation efficiency of curcumin (43.14-51.13%), whilst decreasing relative crystallinity and values of 1047 cm-1/1022 cm-1 ratio, achieving through hydrophobic interaction with OSA-HAS. The enzymatic resistance of WPIF-OSA-HAS complexes with different WPIF/OSA-HAS ratios followed the sequence of r = 0.10 < r = 0.20 < r = 0.30 < r = 0.50 < r = 0.40, and the release rates of curcumin occurred in opposite sequence. Notably, WPIF-OSA-HAS interactions depended on WPIF/OSA-HAS ratios, with the strongest for WPIF/OSA-HAS ratio of 0.4. These findings provided the first insight into the mechanisms behind the resistance of WPIF-OSA-HAS complexes to enzymatic digestion, and the potential for development of resistant starch-based carrier.
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