Comparative Study of Preparation, Evaluation, and Pharmacokinetics in Beagle Dogs of Curcumin β-Cyclodextrin Inclusion Complex, Curcumin Solid Dispersion, and Curcumin Phospholipid Complex

Abstract

Curcumin is a natural acidic polyphenol extracted from turmeric with a wide range of biological and pharmacological effects. However, the application of curcumin for animal production and human life is limited by a low oral bioavailability. In this study, natural curcumin was prepared for the curcumin β-cyclodextrin inclusion complex (CUR-β-CD), curcumin solid dispersion (CUR-PEG-6000), and curcumin phospholipid complex (CUR-HSPC) using co-precipitation, melting, and solvent methods, respectively. Curcumin complex formations were monitored using scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared (FT-IR) techniques via the shifts in the microscopic structure, molecular structure, and crystalline state. Subsequently, twenty-four female beagle dogs were randomly divided into four groups to receive unmodified curcumin and three other curcumin preparations. The validated UPLC–MS assay was successfully applied to pharmacokinetic and bioavailability studies of curcumin in beagle dog plasma, which were collected after dosing at 0 min (predose), 5 min, 15 min, 30 min, 40 min, 50 min, 1.5 h, 3 h, 4.5 h, 5.5 h, 6 h, 6.5 h, 9 h, and 24 h. The relative bioavailabilities of CUR-β-CD, CUR-PEG-6000, and CUR-HSPC were 231.94%, 272.37%, and 196.42%, respectively. This confirmed that CUR-β-CD, CUR-HSPC, and especially CUR-PEG-6000 could effectively improve the bioavailability of curcumin.

Dual-Drug-Loaded Core–Shell Electrospun Nanofiber Dressing for Deep Burns

“…Figure 1C depicts the XRD image of PCL&CS, HP-β-CD NFs, and N-NFD, revealing the presence of semicrystalline structure polymer PCL characterized by three prominent peaks corresponding to the crystal planes (110), (111), and (200). 40 The wide amorphous peaks observed at 10.26 and 18.95°in the core−shell NF were considerably weaker compared to that in the HP-β-CD NF, which indicated that a significant portion of HP-β-CD was coated in the PCL&CS NF. The degradation of three kinds of NF membranes is shown in Figure 1D−G in fresh PBS.…”

“…The relative volatility of the shell jet solvents was 153 and the core was 7, which resulted in phase separation and formed a clear core–shell boundary. Figure C depicts the XRD image of PCL&CS, HP-β-CD NFs, and N-NFD, revealing the presence of semicrystalline structure polymer PCL characterized by three prominent peaks corresponding to the crystal planes (110), (111), and (200) . The wide amorphous peaks observed at 10.26 and 18.95° in the core–shell NF were considerably weaker compared to that in the HP-β-CD NF, which indicated that a significant portion of HP-β-CD was coated in the PCL&CS NF.…”

Turmeric and Curcumin—Health-Promoting Properties in Humans versus Dogs

“…In studies conducted on beagle dogs, it was shown that curcumin inclusion complex β-cyclodextrin (CUR-β-CD), curcumin solid dispersion (CUR-PEG-6000), and curcumin phospholipid complex (CUR-HSPC) can effectively improve the bioavailability of curcumin, even by over 200% [159].…”