RESUMEN
This study aims to develop and characterize NCL loaded with ZnF16Pc (Pc) for application in antimicrobial photodynamic therapy. For the development of the NLC, the fusion-emulsification technique followed by sonication was applied. NLC and Pc-NLC were characterized in terms of mean diameter (Dm.n), polydispersity index (PdI), zeta potential (ZP), encapsulation efficiency (%EE), transmission electron microscopy (TEM), differential scanning (DSC), photobleaching and singlet oxygen generation in cellular systems (SOSG), and in vitro release assays performed by the beaker method, using dialysis membranes. Cell viability was performed by colony forming units (CFU/mL). The mean size of NLC and Pc-NLC was 158 nm ± 1.49 to 161.80 nm and showed PdI < 0.3 and ZP between -17.8 and -19.9, and stable during storage time (90 days). The TEM presented spherical particles, the Pc-NLC promoted the encapsulation of 75.57% ± 0.58. DSC analysis confirmed that there was no incompatibility between Pc and NLC. The analysis of the photodegradation profile proved to be photostable after encapsulation and this corroborates the data obtained by SOSG. In vitro release showed controlled and prolonged release. PDT Pc-NLC exhibited greater antifungal effect against C. albicans (3 log10 reduction) than Pc-NLC without light (1 log10 reduction). NLC can be an alternative to the application of Pc and improve the effect during PDT treatment.
Asunto(s)
Candida albicans , Nanoestructuras , Antifúngicos/farmacología , Portadores de Fármacos/química , Portadores de Fármacos/farmacología , Indoles , Lípidos/química , Nanoestructuras/química , Compuestos Organometálicos , Tamaño de la Partícula , Oxígeno SingleteRESUMEN
Phthalocyanines are second-generation photosensitizers with photophysical and photochemical properties improved, in comparison to the first-generation. Also, these have shown to be phototoxic against several types of microorganisms and tumor cells. However, challenges such as low solubility in the physiological environment make its single administration unfeasible. Therefore, this review discusses a unique combination of phthalocyanine-loaded in drug delivery carriers for photodynamic therapy in different pathologies' treatment, including nanoemulsion, liposomes, and lipid nanoparticles in an attempt to overcome low solubility drawback. Furthermore, the latest advances to elucidating its mechanisms of action are shown. Subsequently, the manuscript was divided into ten different types of phthalocyanines for medical applications, with a description of their definitions and applications, summarizing the latest preclinical results founded in recent literature.