Author(s): Prasad D, Chauhan H, Atef E
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Abstract OBJECTIVE: The lipid excipients of the self-emulsifying drug delivery systems (SEDDS) could play a role in interfering with the drug precipitation to maintain its supersaturation, a step with possible major significance on the SEDDS. Thus, the effect of lipid chain length on indomethacin precipitation rate from SEDDS upon dilution was studied. METHOD: Indomethacin SEDDS were prepared using medium and long chain lipids at 5\% and 13\% (w/w) drug load. Two medium chain lipids Lauroglycol and Capryol, and two long chain lipids Labrafil and castor oil, were studied. The 13\% w/w SEDDS were evaluated for drug release, and the physicochemical properties of the precipitated drug were characterized by PXRD, DSC, IR and Raman. KEY FINDINGS: The final optimized SEDDS consisted of Lauroglycol (lipid): Transcutol (co-solvent): Labrasol (surfactant). No precipitate was observed with long chain lipids SEDDS, whereas medium chain lipids SEDDS showed precipitation within 30 min of drug release from 13\% w/w formulations. Precipitation studies showed that the medium chain lipids resulted in a modified indomethacin form possibly an ester. The ester formation signifies the interaction between indomethacin and medium chain length lipids. CONCLUSIONS: The study emphasizes the importance of lipids chain length of excipients in successful SEDDS formulations. The study provides insight into the underlying drug lipid interactions in SEDDS formulations. © 2013 Royal Pharmaceutical Society.
This article was published in J Pharm Pharmacol
and referenced in Journal of Developing Drugs