Influence of the ionic strength on the physicochemical properties of methotrexate-loaded chitosan polyelectrolyte complexes
DOI:
https://doi.org/10.1590/s2175-97902022e20621Keywords:
Polyelectrolyte complex, Chitosan, Ionic strength, Polydispersity, NanoparticlesAbstract
Polyelectrolyte complexes (PECs) as drug delivery systems are widely explored since they are easily obtained by coacervation and biopolymers can be associated. However, particle distribution is a challenging critical parameter that has been infrequently focused. This work evaluated the effect of NaCl concentration on the physicochemical properties of PECs based on chitosan and hypromellose loaded with methotrexate. The particle size, zeta potential and polydispersity index (PdI) were determined by DLS, besides of drug entrapment efficiency (EE) and in vitro drug release profile determination. Particle size decreased while NaCl concentration rised, achieving a narrower size distribution of (345±79 nm) and PdI (0.285±0.067) with 200 mmol/L NaCl. The higher the NaCl concentration, the lower the zeta potential at acid pH. The EE was kept similar ((28.2±4.5) %) from 0 to 300 mmol/L NaCl, while 400 mmol/L NaCl impaired the drug entrapment. The addition of (200 and 300) mmol/L NaCl did not affect the drug release profile, but it was faster with (100 or 400) mmol/L. In conclusion, the addition of 200 mmol/L NaCl reduced particle size and PdI with no changes in the EE and drug release. Therefore, the ionic strength plays an important role on PECs development.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Grant numbers #1241/2014 -
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Grant numbers 454679/2014-9 -
Fundação de Amparo à Pesquisa do Estado de Minas Gerais