Pazopanib (PZ) is a multikinase inhibitor, which is mainly used in the treatment of soft tissue sarcoma and advanced renal cancer. However, because of its water insolubility, oral bioavailability is poor. At the same time, photo lability and high dose oral administration lead to severe hepatotoxicity, which is limited in clinical application. In this paper, the novel pazopanib-fumarate disodium glycyrrhizinate nanocrystalline micelles are successfully prepared by liquid-assisted ball milling. The prepared cocrystals and nanocrystalline micelle structures are systematically characterized by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and Fourier Transform Infrared Spectrometer (FTIR) analysis. In vitro solubility and dissolution experiments show that the solubility and dissolution of nanocrystalline micelles are significantly improved under different simulated physiological conditions. The accelerated stabilization experiments show that the nanocrystalline micelles have good physical and chemical stability and showed excellent stability in water (Zeta potential was 62.39 mV). In addition, the in vivo bioavailability of nanocrystalline micelles is 3 times higher than that of PZ, and the therapeutic threshold (> 20 μg/mL) is up to 30 h. This new strategy provides a feasible solution to the undesirable properties of PZ.
Keywords: Bioavailability; Cocrystals; Nanocrystalline micelle; Pazopanib; Stability.
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