Abstract
This work aimed to investigate the most plausible molecular interactions between β-carotene (βCat) and orange-fleshed sweet potato (OFSP) starch, by using a bleaching-restitution strategy. OFSP's raw flour (RF) was partially (TF) and extensively (starch) bleached with a graded polarity solvent system. The in vitro interaction (saturated restitution) of pure βCat to starch (βCat + S) at 2.5, 5, 10 g.100 g−1 was tracked by FE-SEM, ATR-FTIR, XRD and changes in starch digestibility [slow (SDS), rapid (RDS), and resistant (RS)] were documented. βCat + S interaction occurs mostly by H+ bonding (inter and intra-helical) and CH–π stacking (alkene chains - glucose rings), altering starch's molecular order and crystallinity, RS: SDS ratio and increasing intra/inter type-V inclusion and non-inclusion complexes, in a dose-dependent manner. Data suggests that βCat + S is governed by non-covalent forces promoting starch's resistance to digestion, probably influencing the bioaccessibility and bioavailability of both βCat and glucose monomers.
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