Abstract
This study aimed to develop a self-nanoemulsifying drug delivery system (SNEDDS) for poorly water-soluble drug stiripentol (STP) with enhanced oral bioavailability. Optimal excipients were selected by constructing pseudo-ternary phase diagrams using determined solubilities of STP, and then the proper composition of SNEDDS was investigated by employing a central composite design method. The optimized SNEDDS was composed of oil (ethyl oleate 39.61%), surfactant (Cremophor® RH 40 43.18%), co-surfactant (1,2-propanediol 17.21%), and STP of 50 mg/mL. The hydrodynamic size, zeta potential, and polydispersity index (PDI) were found to be 45.52 ± 1.99 nm, − 21.67 ± 0.24 mV, and 0.076 ± 0.011, respectively. The optimized STP-SNEDDS showed good stability in accelerated and dilution stability studies. It was also helpful to suppress STP degradation in acidic solution. Compared with STP suspension, STP-SNEDDS presented much faster dissolution rate. STP-SNEDDS successfully resulted in superior levels of Cmax and AUC0 → 6 h (4048.38 ± 704.54 μg/L and 7754.58 ± 1489.37 h μg/L, respectively) to STP suspension (1894.09 ± 1077.64 μg/L and 3556.93 ± 2470.01 h μg/L, respectively). The relative oral bioavailability of STP was 218.01%. The brain biodistribution studies showed that STP-SNEDDS presented significantly higher STP concentrations in the brain at 0.5 h and 1 h than that of STP suspension after administration. These findings indicated that a SNEDDS-based oral formulation of STP would be helpful for increasing its therapeutic potential.
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Acknowledgments
We acknowledge the valuable help from Dr. Changlai Zhu at Jiangsu Key Laboratory of Nerve Regeneration of Nantong University for the acquisition of the TEM images.
Funding
We thank the financial supports from the China National Natural Science Foundation (81603044), the China Postdoctoral Science Foundation (2017 M611886), the Innovation and Entrepreneurship Training Program for College Students in Jiangsu Province (201710304080Y, 201810304040Z), the Large Instruments Open Foundation of Nantong University (KFJN1852), and the Nantong University Cooperative Innovation Program of Small Molecular Compound R&D-NTU2016–1.
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This study was approved by the Laboratory Animal Ethics Committee of Nantong University. All the animal experiments were performed according to the NIH (National Institutes of Health USA) (2011) Guide for the Care and Use of Laboratory Animals.
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Dai, Q., Zhang, P., Jin, Y. et al. Using Self-Nanoemulsifying System to Improve Oral Bioavailability of a Pediatric Antiepileptic Agent Stiripentol: Formulation and Pharmacokinetics Studies. AAPS PharmSciTech 21, 192 (2020). https://doi.org/10.1208/s12249-020-01730-z
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DOI: https://doi.org/10.1208/s12249-020-01730-z