Preparation, characterization, and antioxidant activity of 8-cyclodextrin nanoparticles loaded Rosa damascena essential oil for application in beverage

Rosa damascena essential oil (REO) is volatile and unstable. The host-guest complex of beta-cyclodextrin nanoparticles (8 -CD) with REO was produced to improve REO characteristics. The REO/8-CD complex was characterized by entrapment efficiency, morphology, crystallinity, particle size, thermal stability, and antioxi-dant activity. Additionally, the structure of REO/8-CD was evaluated using Fourier transform infrared spec-troscopy (FT-IR) and nuclear magnetic resonance (NMR). Results confirmed the formation of REO/8-CD in which the REO, as a guest molecule, was entrapped within the 8 -CD as a host molecule. The encapsulated particles showed a spherical shape with an average diameter of 110 nm and no strong agglomerate. The entrapment of REO within 8 -CD led to changes in some physicochemical characteristics and enhancement of the antioxidant activity of REO. Furthermore, beverages with the addition of 8 -CD nanoparticle-loaded REO were produced. The beverage containing 8 -CD nanoparticle-loaded REO form showed significantly higher overall acceptability than samples containing free REO.