The purpose of this study was to offer a new insight into the microstructure changes during in vitro lipolysis of five lipid-based\ndrug delivery formulations belonging to different lipid formulation types. Five lipid-based formulations of indomethacin were\ninvestigated using an in vitro lipolysis model. During lipolysis, microstructures of the intermediate phase formed by lipolytic\nproducts were observed.The results showed that the time of liquid crystal formation during in vitro digestion for these formulations\nwas Type I > Type II > Type IIIB > Type IV > Type IIIA (
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