Insight into the insoluble dietary fiber from quinoa bran on the physicochemical and in vitro digestibility properties of quinoa starch: from perspective of bound phenolics removal

Le résumé fourni par la source

Bound phenolics (BP) are crucial for maintaining insoluble dietary fiber (IDF) integrity and functionality, but their role in fiber-starch interactions remains under-explored. This study investigated the role of BP in modulating interactions between quinoa IDF (QIDF) and quinoa starch (QS). QIDF with BP removed (QIDF-BP) was prepared through de-phenolization treatment. Results showed that BP removal reduced QIDF's water-holding capacity, increased crystallinity, and loosened its structure. Furthermore, physicochemical properties, in vitro digestibility, and multi-scale structures of QS samples incorporated with QIDF or QIDF-BP were investigated. Results indicated that incorporating QIDF or QIDF-BP into QS enhanced pasting properties, thermal stability, and rheological behavior, including increased breakdown viscosity, pasting temperature, transition temperatures, and flow index ( P < 0.05). In vitro digestion revealed that both QIDF and QIDF-BP promoted the conversion of rapidly digestible starch and resistant starch to slowly digestible starch. Notably, QIDF inhibited QS digestion more effectively than QIDF-BP ( P < 0.05). Structural analyses confirmed that QIDF and QIDF-BP enhanced QS's ordered and double-helical structure. These findings clarify how BP modulate the starch-fiber interactions, providing a theoretical foundation for future research, and offering new insights into how modifying BP levels in dietary fibers can optimize food properties for health-promoting applications. • Bound phenolics regulated the interaction between IDF and starch. • BP removal reduced QIDF's water-holding capacity and increased its crystallinity. • QIDF and QIDF-BP exerted distinct impacts on the physicochemical properties of QS. • BP in QIDF strengthen its inhibition on QS digestion compared to QIDF-BP.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.