ABSTRACT
Purpose
To develop solid self-emulsifying drug delivery systems (SEDDS) for lipids using poloxamer 188 as both solidifying and emulsifying agents.
Methods
Mixtures of various lipids with poloxamer 188 and PEG 8000 were prepared at ~75°C. The molten mixtures, with and without dissolved drugs (fenofibrate and probucol), were then cooled to room temperature. When solids formed, they were characterized by powder XRD, DSC, microscopy using cross-polarization and confocal fluorescence techniques, dispersion test in water and particle size analysis of dispersions.
Results
When mixed with poloxamer 188 or PEG 8000, lipids consisting of monoesters of fatty acids with glycerol or propylene glycol formed solid systems, but not di- and tri-esters, which showed phase separation. Added to water, the solid systems containing poloxamer 188 started to disperse in water forming oil globules of 200–600 nm. No emulsification of lipids was observed from solids containing PEG 8000, indicating that the surfactant property of poloxamer 188 was responsible for emulsification. Powder XRD, DSC and microscopic examination revealed that poloxamer 188 and PEG 8000 maintained their crystallinity in solid systems, while the lipids were interspersed in between crystalline regions. The drug remained solubilized in the lipid phase.
Conclusions
A novel solid SEDDS is developed where the drug can be solubilized in liquid lipids and then the lipidic solution can be converted to solid mass by dispersing into the microstructure of poloxamer 188.
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ACKNOWLEDGMENTS & DISCLOSURES
The authors thank ABITEC Corp., 501 W 1st Avenue, Columbus, OH 43215, USA for a research grant that partially supported this project. They also thank Mr. Louis E. Bryan from the department of Biological Sciences, St. John’s University, for his assistance in confocal fluorescence microscopic analysis of samples.
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Shah, A.V., Serajuddin, A.T.M. Development of Solid Self-Emulsifying Drug Delivery System (SEDDS) I: Use of Poloxamer 188 as Both Solidifying and Emulsifying Agent for Lipids. Pharm Res 29, 2817–2832 (2012). https://doi.org/10.1007/s11095-012-0704-x
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DOI: https://doi.org/10.1007/s11095-012-0704-x