A novel performing PEG-cholane nanoformulation for Amphotericin B delivery

International Journal of Pharmaceutics
Claudia Luengo-AlonsoPaolo Caliceti

Abstract

A novel formulation for amphotericin B (AmB) delivery has been developed using micelle-forming 5 kDa monomethoxy-polyethylene glycol functionalized with cholanic acid (PEG 5kDa-cholane). This polymer was found to increase 10(3) times the AmB solubility with a 12:1 AmB/PEG5 kDa-cholane molar ratio (2:1 w/w ratio). Dynamic light scattering and transmission electron microscopy analyses showed that PEG5 kDa-cholane associated with AmB to form 30 nm micelles. Isothermal titration calorimetry analyses performed at different pH showed that PEG 5kDa-cholane interacts with AmB according to multiple-site association profiles. Affinity constants and enthalpy and entropy changes were found to depend on pH, suggesting that the polymer interaction depends on the AmB ionization and aggregation. The freeze-dried product could be promptly re-dispersed forming a colloidal dispersion with the biopharmaceutical features of the freshly prepared micelles, namely AmB solubility and micelle size. The dispersion was stable over one month incubation at room temperature. FT-infrared spectrometry, differential scanning calorimetry and X-ray diffractometry showed that in the freeze-dried product, AmB intimately interacts with PEG 5kDa-cholane. In presence ...Continue Reading

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Citations

Feb 11, 2016·Journal of Controlled Release : Official Journal of the Controlled Release Society·Elena AmbrosioStefano Salmaso
Aug 22, 2018·Biomacromolecules·Elena AmbrosioStefano Salmaso

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