Association Efficiency of Three Ionic Forms of Oxytetracycline to Cationic and Anionic Oil-In-Water Nanoemulsions Analyzed by Diafiltration
Author
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Orellana, Sandra L.
Author
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Torres Gallegos, César
Author
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Araya Hermosilla, Rodrigo
Author
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Oyarzún Ampuero, Felipe
Author
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Moreno Villoslada, Ignacio
Admission date
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2015-08-17T20:18:02Z
Available date
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2015-08-17T20:18:02Z
Publication date
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2015
Cita de ítem
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Journal of Pharmaceutical Sciences Volume 104, Issue 3, pages 1141–1152, March 2015
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Identifier
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DOI: 10.1002/jps.24255
Identifier
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https://repositorio.uchile.cl/handle/2250/132798
General note
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Artículo de publicación ISI
en_US
Abstract
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The association efficiency of oxytetracycline (OTC) to pharmaceutical available, ionic oil-in-water nanoemulsions is studied. Theoretical mathematical developments allowed us to differentiate by diafiltration (DF) between thermodynamically and kinetically controlled binding of the drug to the nanoemulsions, and relate these important magnitudes to the association efficiency. The nanoemulsions have been prepared by the solvent displacement technique in the presence of cationic and anionic surfactants. The resulting nanoemulsions were stable at 4°C and 25°C for 60 days, have a size of ∼200 nm, showing polydispersity indexes ranging between 0.11 and 0.23, and present zeta potentials ranging between −90 and +60 mV, depending on the charge of the surfactants used. The zeta potential of the nanoemulsions influenced the interaction with OTC, having three ionic forms at different pH, namely, cationic, zwitterionic, and anionic. DF proved to be a powerful tool for the quantification of the drug association efficiency, achieving values up to 84%. Furthermore, this technique allowed obtaining different values of the drug fractions reversibly bound (11%–57%) and irreversibly bound (10%–40%) to the nanoemulsions depending on the surfactants used and pH. These findings may be useful for the development of new drug delivery systems, and as routine assays in academia and pharmaceutical industries.
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Patrocinador
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FONDECYT (grants No. 3110153, 11121481, and 1120514)