Resveratrol nanoparticles coated by metal-polyphenols supramolecular enhance antioxidant activity and long-term stability of dietary gel

Resveratrol (RES) is an important functional substance with multiple active properties. However, RES is susceptible to natural environmental conditions that reduce its bioactivity. To improve the bioavailability of RES, in this study, Catechin and Fe³⁺/Ca²⁺ were selected to form supramolecules, which were then coated on the surface of hydrophobic RES nanoparticles (RES NPs) to create composite RES NPs. The obtained composite RES NPs demonstrated higher antioxidant capacity and better photo-thermal stability than RES NPs. Additionally, a pectin (PE) dietary gel was designed as a delivery carrier for RES. The results showed that the incorporation of composite RES NPs not only endowed the gels with significant dietary activity but also enhanced the texture, water retention capacity and hydrophobicity. After 28 days of storage, the retention rate of RES could be maintained above 90 % in the dietary gels. Meanwhile, the controlled release of RES was achieved in in vitro simulated digestion.