Comparative physical-chemical characterization of encapsulated lipid-based isotretinoin products assessed by particle size distribution and thermal behavior analyses

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Guimaraes, Carla Aiolfi
Menaa, Farid
Menaa, Bouzid
Quenca-Guillen, Joyce S.
Matos, Jivaldo do Rosario
Mercuri, Lucildes Pita [UNIFESP]
Braz, Andre Borges
Rossetti, Fabia Cristina
Maria Kedor-Hackmann, Erika Rosa
Rocha Miritello Santoro, Maria Ines
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Isotretinoin is the drug of choice for the management of severe recalcitrant nodular acne. Nevertheless, some of its physical-chemical properties are still poorly known. Hence, the aim of our study consisted to comparatively evaluate the particle size distribution (PSD) and characterize the thermal behavior of the three encapsulated isotretinoin products in oil suspension (one reference and two generics) commercialized in Brazil. Here, we show that the PSD, estimated by laser diffraction and by polarized light microscopy, differed between the generics and the reference product. However, the thermal behavior of the three products, determined by thermogravimetry (TGA), differential thermal (DTA) analyses and differential scanning calorimetry (DSC), displayed no significant changes and were more thermostable than the isotretinoin standard used as internal control.Thus, our study suggests that PSD analyses in isotretinoin lipid-based formulations should be routinely performed in order to improve their quality and bioavailability. (C) 2010 Elsevier B.V. All rights reserved.
Thermochimica Acta. Amsterdam: Elsevier B.V., v. 505, n. 1-2, p. 73-78, 2010.