Title

An investigation into structural properties and stability of debranched starch-lycopene inclusion complexes with different branching degrees.

Authors

.Tingting Gu, Xiumei Zhang, Yongqiang Gong, Tiantian Zhang, Lili Hu, Yiyang Yu, Changyue Deng, Yaqing Xiao, Mingming Zheng, Yibin Zhou*.

Journal

International Journal of Biological Macromolecules

DOII

10.1016/j.ijbiomac.2023.123641

Abstract

Debranched starch (DBS) has great probability as carrier for bioactive ingredients, but effects of branching degree (DB) on the complex formation of starch remain unclear. This study investigated the potential of DBS with different DB to load lycopene and characterized the structural properties of inclusion complexes. Glutinous rice starch was debranched to get DBS with different molecular weights, where DBS with a branching degree of 11.42 % had the greatest encapsulation efficiency (64.81 %). SEM, particle size, and zeta-potential results showed that the complexes form stable spherical crystals through electrostatic interactions. The structures of complexes were resolved by FTIR, XRD, TGA, and 13C CP/MAS NMR analytical techniques, indicating that lycopene can be loaded on DBS by the self-assembly through hydrophobic and hydrogen bonding interactions. Degradation experiments revealed that retention of complexes was significantly higher than the unencapsulated one. Our study reveals the structural features of the complex between DBS and lycopene, providing theoretical guidance for developing and producing novel nutraceuticals. All rights reserved, Elsevier.