期刊
MOLECULES
卷 26, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/molecules26030519
关键词
cyclodextrin inclusion; solution-phase; solid state; antiretroviral
资金
- University of Aveiro
- FCT/MCTES (Fundacao para a Ciencia e a Tecnologia, Ministerio da Ciencia, da Tecnologia e do Ensino Superior) [FCT UID/QUI/00062/2019]
- LAQV-REQUIMTE [UIDB/50006/2020]
- CICECO-Aveiro Institute of Materials [UIDB/50011/2020, UIDP/50011/2020]
- FEDER, within the PT2020 Partnership Agreement
- FEDER through the operational programme COMPETE 2020 [022161]
- FEDER through POCI [022161]
- FEDER through PORL [022161]
- FCT through PIDDAC [022161]
This study investigated the interaction between gamma-cyclodextrin and efavirenz in both solution and solid state. The 3:2 host-to-guest stoichiometry was found to be the optimal condition for isolating a solid inclusion compound. The effect of gamma-cyclodextrin on the solubility of efavirenz was examined using the isotherm method.
Efavirenz is an antiretroviral drug of widespread use in the management of infections with human immunodeficiency virus type 1 (HIV-1). Efavirenz is also used in paediatrics, but due to its very poor aqueous solubility the liquid formulations available resort to oil-based excipients. In this report we describe the interaction of gamma-cyclodextrin with efavirenz in solution and in the solid state. In aqueous solution, the preferential host-guest stoichiometry was determined by the continuous variation method using H-1 NMR, which indicated a 3:2 host-to-guest proportion. Following, the solid inclusion compound was prepared at different stoichiometries by co-dissolution and freeze-drying. Solid-state characterisation of the products using FT-IR, C-13{H-1} CP-MAS NMR, thermogravimetry, and X-ray powder diffraction has confirmed that the 3:2 stoichiometry is the adequate starting condition to isolate a solid inclusion compound in the pure form. The effect of gamma-cyclodextrin on the solubility of efavirenz is studied by the isotherm method.
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