Abstract：
: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.
journal_name
J Pharm Scijournal_title
Journal of pharmaceutical sciencesauthors
Orellana SL,Torres-Gallegos C,Araya-Hermosilla R,Oyarzun-Ampuero F,Moreno-Villoslada Idoi
10.1002/jps.24255subject
Has Abstractpub_date
2015-03-01 00:00:00pages
1141-52issue
3eissn
0022-3549issn
1520-6017pii
S0022-3549(16)30036-3journal_volume
104pub_type
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journal_title：Journal of pharmaceutical sciences
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doi：10.1002/jps.2600640206
更新日期：1975-02-01 00:00:00
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更新日期：1998-09-01 00:00:00
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journal_title：Journal of pharmaceutical sciences
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journal_title：Journal of pharmaceutical sciences
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更新日期：1979-03-01 00:00:00
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journal_title：Journal of pharmaceutical sciences
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doi：10.1002/jps.2600670813
更新日期：1978-08-01 00:00:00
