title: Validation of an UV spectrophotometric assay for the quantification of polymyxin B in solid lipid nanoparticles.
abstract: Polymyxins are efficient antibiotic drugs used for the treatment of Gram-negative bacterial infections. These compounds are not absorbed in the gastrointestinal tract and are responsible for serious toxicological effects. In order to enhance their therapeutic effectiveness, decrease the adverse/toxic side effects and promote a sustained release profile, a derivative--polymyxin B sulphate--has been formulated in solid lipid nanoparticles (SLNs) intended for buccal administration. To quantify polymyxin B in the formulation, UV spectrophotometry analysis was applied, validating the analytical methodology by assessing the selectivity, accuracy, precision, linearity, and repeatability. Analyses were performed at 210 nm keeping the samples at 25 degrees C. Results showed that lipid composition of SLNs did not interfere with the polymyxin B spectra. The linearity showed a correlation coefficient of 0.9977 in the range of 5-90 μg/mL. Quantification of polymyxin B by UV spectrophotometry, at 210 nm in SLN formulations, was approved in all analyzed parameters, validating the methodology proposed in this work.
authors.forename: P
authors.initials: P
authors.lastname: Severino
authors.forename: E F
authors.initials: EF
authors.lastname: Silveira
authors.forename: M
authors.initials: M
authors.lastname: Vazzana
authors.forename: M V
authors.initials: MV
authors.lastname: Chaud
authors.forename: M H A
authors.initials: MH
authors.lastname: Santana
authors.forename: E B
authors.initials: EB
authors.lastname: Souto
mesh_terms: D000465:Algorithms; D000900:Anti-Bacterial Agents / Q000032:analysis*; D003692:Delayed-Action Preparations; D004339:Drug Compounding; D008055:Lipids / Q000032:analysis; D053758:Nanoparticles / Q000032:analysis*; D011112:Polymyxin B / Q000032:analysis*; D015203:Reproducibility of Results; D013056:Spectrophotometry, Ultraviolet
chemical_list: D000900:Anti-Bacterial Agents; D003692:Delayed-Action Preparations; D008055:Lipids; D011112:Polymyxin B