Dopamine-loaded chitosan-coated solid lipid nanoparticles as a promise nanocarriers to the CNS.

Dopamine is unable to access the central nervous system through the bloodstream. Only its precursor can do so, and with an effectiveness below 100% of the dose administered, as it is metabolized before crossing the blood-brain barrier. In this study, we describe a new solid lipid nanocarrier system designed and developed for dopamine. The nanoparticles were prepared by the melt-emulsification method and then coated with chitosan. The nanocarriers developed had a droplet size of about 250 nm, a polydispersity index of 0.2, a positive surface charge (+30 mV), and a percentage encapsulation efficiency of 36.3 ± 5.4. Transmission and scanning electron microscopy verified uniformity of particle size with spherical morphology. Various types of tests were performed to confirm that the nanoparticles designed are suitable for carrying dopamine through the blood-brain barrier. In vitro tests demonstrated the ability of these nanocarriers to pass through endothelial cell monolayers without affecting their integrity. This study shows that the formulation of dopamine in chitosan-coated solid lipid nanoparticles is a potentially viable formulation strategy to achieve the bioavailability of the drug for the treatment of Parkinson's disease in the central nervous system.

Design and development of a facial Serum with Lactobacillus fermentum CECT 5716 / Diseño y elaboración de un sérum facial con Lactobacillus fermentum CECT 5716

Introducción: De todos los órganos del cuerpo, la piel es el que está directa y constantemente expuesto a agentes externos. De ahí la importancia de proporcionarle todos los nutrientes necesarios para mantenerla sana, cuidada e hidratada. Con esta intención se ha diseñado y desarrollado un sérum hidratante con ingredientes activos naturales que incluye una cepa de la especie probiótica Lactobacillus fermentum CECT 5716, como innovación, para potenciar el efecto sinérgico del producto. Método: El producto citado ha sido caracterizado mediante determinaciones de pH, conductividad y viscosidad para probar su estabilidad. Además, se ha estudiado la viabilidad del probiótico y la percepción de los consumidores en estudios de eficacia del producto. Resultados: Los datos extraídos de las mediciones de pH y conductividad aseguran que la aplicación tópica del sérum es segura, al igual que la percepción de eficacia del producto por los consumidores, ofreciendo una mejor apariencia en términos de suavidad y luminosidad. Además, esta investigación ha revelado las características pseudoplásticas del sérum, óptimas para su propósito. Por último, se ha visto que la viabilidad probiótica disminuye con el tiempo. Conclusiones: En base a los resultados obtenidos, se puede afirmar que nuestro sérum hidratante es seguro y eficaz en la hidratación cutánea, debido a las propiedades de las materias primas incorporadas y el mecanismo competitivo de los probióticos incluidos. (AU)

Introduction: The skin is of all the organs of the body that is directly and constantly exposed to external agents. Hence the importance of providing all the necessary nutrients to keep it healthy, cared for and hydrated. When this does not happen, the skin begins to lose water, becomes dehydrated, and can be seriously injured. With this inten-tion, a moisturizing serum with natural active ingredients has been designed and developed. It has been developed and characterized through various studies. In addition, it includes a strain of the probiotic species Lactobacillus fermentum CECT 5716, as an innovation, to enhance the synergistic effect of the product.Method: The cited product is characterized by pH, conductivity, and viscosity measurements to test its stability. Besides it is studied to probiotic viability and consumers’ perception of the product’s efficacy.Results: Data extracted from pH and conductivity measurements assure that the topical application of our serum is safe, as it does the consumers’ perception of the product’s efficacy study, offering it a better appearance in terms of smoothness and luminosity. This research has revealed the serum’s pseudoplastic characteristics, optimal for its purpose. Lastly, it has been seen that probiotic viability decreases with time.Conclusions: Based on the results we obtained; it can be affirmed that our moisturizing serum is safe and effective in skin hydration, due to the properties of the raw materials incorporated and the competitive mechanism of the probiotics included. (AU)