Study of the inclusion complex and antioxidating activity of Wogonin with β-cyclodextrin and hydroxypropyl-cyclodextrin

β-cyclodextrin microencapsulation enhanced antioxidant and antihyperlipidemic properties of Tunisian Periploca angustifolia roots condensed tannins in rats

This study aimed to investigate the microencapsulation of novel condensed tannins isolated from Periploca angustifolia roots, using β-cyclodextrin macrocyclic oligosaccharides, in order to enhance their antioxidant and antihyperlipidemic potentials. Scanning electron microscopy and Fourier transform infrared spectroscopy results revealed that tannin fraction was successfully included into β-cyclodextrin cavities proved with an encapsulation efficacy of 70%. Our in vitro findings highlighted that both pure and encapsulated tannins have efficient inhibition capacities of pancreatic lipase activity. However, the inclusion complex has the greatest, in vivo, antioxidant, and antihyperlipidemic effects. In fact, results showed that complexed tannins had markedly restored serum lipid biomarkers, lipid peroxidation, protein carbonyl oxidation, and antioxidant enzyme defense. These findings were additionally confirmed by aortic and myocardial muscle sections of histological examination. Consequently, β-cyclodextrin microencapsulation may be considered as an effective and promising technique for tannin delivery with improved antioxidant and antihyperlipidemic activities.

Antioxidant, antibacterial and anti-cancer activities of β-and γ-CDs/curcumin loaded in chitosan nanoparticles

Curcumin, as a naturally occurring polyphenol, has been extensively used as anticancer and antioxidant agent due to its ability to protect cells from oxidative damage. In the present study, we have prepared highly soluble CUR-β-cyclodextrin (β-CD) and γ-cyclodextrin (γ-CD) hollow spheres. UV-Vis method was employed to approve the successful formation of the inclusion complex where the aromatic ring of CUR has been encapsulated by the hydrophobic cavity of CDs. CUR-CDs were then encapsulated into positively charged biodegradable chitosan (CUR-CDs-CS) nanoparticles. The CUR-CD-CS were characterized by UV-Vis, FTIR, ¹HNMR, XRD, SEM analysis. Antibacterial efficacy was evaluated by measuring the zone of inhibition scale and MIC value which was recorded as 32 μg/mL and 64 μg/mL for both Gram positive S. aureus and Gram negative E. coli bacteria respectively. We tested the efficacy of these CUR-CD-CS nanoparticles in A549 cell lines using MTT assay and investigated its cellular uptake mechanism. Our results demonstrated that CUR-CD-CS nanoparticles showed superior in vitro release performance and higher cytotoxicity in A549 cell line among all tested formulations. Antioxidant activity and release behavior of the curcumin-loaded CDs-CS was investigated. The IC₅₀ value for CUR/CD-CS was estimated based on their inhibition percent-concentration curves using DPPH assay.