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Association efficiency of three ionic forms of oxytetracycline to cationic and anionic oil-in-water nanoemulsions analyzed by diafiltration.
- Source :
-
Journal of pharmaceutical sciences [J Pharm Sci] 2015 Mar; Vol. 104 (3), pp. 1141-52. Date of Electronic Publication: 2014 Dec 29. - Publication Year :
- 2015
-
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.<br /> (© 2014 Wiley Periodicals, Inc. and the American Pharmacists Association.)
- Subjects :
- Anions
Cations
Chemistry, Pharmaceutical
Drug Stability
Emulsions
Hydrogen-Ion Concentration
Hydrophobic and Hydrophilic Interactions
Kinetics
Models, Chemical
Nanotechnology
Solubility
Surface Properties
Surface-Active Agents chemistry
Temperature
Anti-Bacterial Agents chemistry
Drug Carriers
Filtration methods
Nanoparticles
Oils chemistry
Oxytetracycline chemistry
Technology, Pharmaceutical methods
Water chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 1520-6017
- Volume :
- 104
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- Journal of pharmaceutical sciences
- Publication Type :
- Academic Journal
- Accession number :
- 25557590
- Full Text :
- https://doi.org/10.1002/jps.24255