Engineering alginate-based dry powder microparticles to a size suitable for the direct pulmonary delivery of antibiotics

Arauzo, Beatriz (Universidad de Zaragoza) ; González-Garcinuño, Álvaro ; Tabernero, Antonio ; Calzada-Funes, Javier (Universidad de Zaragoza) ; Lobera, María Pilar (Universidad de Zaragoza) ; del Valle, Eva M. Martín ; Santamaria, Jesús (Universidad de Zaragoza)

Resumen: The inhaled route is regarded as one of the most promising strategies as a treatment against pulmonary infections. However, the delivery of drugs in a dry powder form remains challenging. In this work, we have used alginate to form microparticles containing an antibiotic model (colistin sulfate). The alginate microparticles were generated by atomization technique, and they were characterized by antimicrobial in vitro studies against Pseudomonas aeruginosa. Optimization of different parameters allowed us to obtain microparticles as a dry powder with a mean size (Feret diameter) of 4.45 ± 1.40 µm and drug loading of 8.5 ± 1.50%. The process developed was able to concentrate most of the colistin deposits on the surface of the microparticles, which could be observed by SEM and a Dual-Beam microscope. This produces a fast in vitro release of the drug, with a 100% release achieved in 4 h. Physicochemical characterization using the FTIR, EDX and PXRD techniques revealed information about the change that occurs from the amorphous to a crystalline form of colistin. Finally, the cytotoxicity of microparticles was tested using lung cell lines (A549 and Calu-3). Results of the study showed that alginate microparticles were able to inhibit bacterial growth while displaying non-toxicity toward lung cells.

Idioma: Inglés

DOI: 10.3390/pharmaceutics14122763

Año: 2022

Publicado en: Pharmaceutics 14, 12 (2022), 2763 [19 pp.]
ISSN: 1999-4923

Factor impacto JCR: 5.4 (2022)

Categ. JCR: PHARMACOLOGY & PHARMACY rank: 50 / 278 = 0.18 (2022) - Q1 - T1

Factor impacto CITESCORE: 6.9 - Pharmacology, Toxicology and Pharmaceutics (Q1)

Factor impacto SCIMAGO: 0.795 - Pharmaceutical Science (Q1)

Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2019-108994RB-I00

Tipo y forma: Article (Published version)

Área (Departamento): Área Ingeniería Química (Dpto. Ing.Quím.Tecnol.Med.Amb.)