Journal
MOLECULAR PHARMACEUTICS
Volume 17, Issue 9, Pages 3236-3245Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.molpharmaceut.0c00343
Keywords
self-emulsifying drug delivery systems (SEDDS); cosolvent release; nanoemulsions; Taylor dispersion analyses (TDA); bioavailability
Funding
- Centre for International Cooperation & Mobility (ICM) of the Austrian Agency for International Cooperation in Education and Research (OeAD-GmbH) [FR 13/2020]
- Federal Ministry of Education, Science, and Research (BMBWF)
- French Ministry of Foreign Affairs (MAEE)
- French Ministry for Higher Education and Research (MESR) (Project PHC AMADEUS 2020) [44090VA]
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The aim of this study was to investigate the fate and the impact of cosolvents in self-emulsifying drug delivery systems (SEDDS). Three different SEDDS comprising the cosolvents DMSO (F-D), ethanol (FE), and benzyl alcohol (F-BA) as well as the corresponding formulations without these cosolvents (F-D0, F-E0, and FBA0) were developed. Mean droplet size, polydispersity index (PDI),. potential, stability, and emulsification time were determined. Cosolvent release studies were performed via the dialysis membrane method and Taylor dispersion analysis (TDA). Furthermore, the impact of cosolvent utilization on payloads in SEDDS was examined using quinine as a model drug. SEDDS with and without a cosolvent showed no significant differences in droplet size, PDI, and. potential. The emulsification time was 3-fold (FD0), 80-fold (FE0), and 7-fold (FBA0) longer due to the absence of the cosolvents. Release studies in demineralized water provided evidence for an immediate and complete release of DMSO, ethanol, and benzyl alcohol. TDA confirmed this result. Moreover, a 1.4-fold (FD), 2.91-fold (FE), and 2.17-fold (FBA) improved payload of the model drug quinine in the selected SEDDS preconcentrates was observed that dropped after emulsification within 1-5 h due to drug precipitation. In parallel, the quinine concentrations decreased until reaching the same levels of the corresponding SEDDS without cosolvents. Due to the addition of hydrophilic cosolvents, the emulsifying properties of SEDDS are strongly improved. As hydrophilic cosolvents are immediately released from SEDDS during the emulsification process, however, their drug solubilizing properties in the resulting oily droplets are very limited.
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