Enhancing Niclosamide Bioavailability through Solid SNEDDS and Surface-Coated Microspheres
Recent advancements in drug delivery systems are revolutionizing the treatment landscape by addressing the challenges posed by poorly soluble drugs. One such drug, niclosamide, has shown potential beyond its traditional use as an antihelminthic. Through the development of advanced formulations, including solid self-nanoemulsifying drug delivery systems (SNEDDS) and surface-coated microspheres, researchers have successfully enhanced its solubility, dissolution, and bioavailability, opening up new possibilities for clinical applications.
Understanding Solid SNEDDS and Microspheres
Solid SNEDDS incorporates the advantages of liquid SNEDDS, such as improved solubility and bioavailability, while offering the benefits of stability, patient compliance, and accurate dosing. Solid forms can be created through techniques like spray drying, freeze drying, or direct absorption of nanoemulsion preconcentrates onto microporous carriers. This study focuses on optimizing solid SNEDDS and surface-coated microspheres to improve niclosamide’s water solubility and dissolution profiles.
Optimization Process
The selection of optimal components involved extensive investigations into the effects of hydrophilic polymers, oils, and surfactants on niclosamide’s solubility. Pseudo-ternary phase diagrams were constructed to determine the ideal composition. Corn oil was identified as the most suitable oil component due to its high stability and low toxicity.Tween 80 and Cremophor RH40 were selected as surfactant and co-surfactant, respectively, for their excellent solubilizing properties.
Preparation of Solid SNEDDS
The liquid SNEDDS formulation was prepared by mixing corn oil, Cremophor RH40, and Tween 80 in a 20/24/56 volume ratio. This mixture was then converted into a solid form using calcium silicate as the porous carrier through spray drying. The process ensured uniform distribution and resulted in a solid SNEDDS with the smallest nanoemulsion droplets.
Development of Surface-Coated Microspheres
Surface-coated microspheres, formed by spray drying, used sodium alginate and poloxamer 407 as the polymer and surfactant. Testing different formulations to determine the optimal ratio revealed that na-alginate:niclosamide:poloxamer 407 ratio of 0.75:1:0.25 significantly improved solubility and dissolution rates. Formulation IV provided a substantial increase in solubility (158-fold) compared to unformulated niclosamide.
Characterization of Physicochemical Properties
Advanced analytical techniques, including differential scanning calorimetry (DSC), powder X-ray diffraction (PXRD), and scanning electron microscopy (SEM), were employed to assess the physicochemical properties of niclosamide in the new formulations. DSC and PXRD confirmed that niclosamide remained crystalline in microspheres and solid powders, while it transformed into an amorphous state in solid SNEDDS. SEM provided visual evidence of the nanoscale structures inside solid SNEDDS and the microspheres.
Comparison of Solubility and Dissolution
The solubility of niclosamide was significantly enhanced in both solid SNEDDS and surface-coated microspheres compared to its powder form. Solid SNEDDS exhibited the highest dissolution rate, reaching 100% within 60 minutes. Surface-coated microspheres also showed improved solubility but at a slower rate. The superior dissolution efficiency in solid SNEDDS was attributed to its oil-in-water nanoemulsion formation upon introduction to water.
Pharmacokinetic Evaluation
Oral bioavailability studies in rats were conducted to compare the pharmacokinetic parameters of niclosamide in its unformulated, solid SNEDDS, and surface-coated microsphere forms. Solid SNEDDS products demonstrated significantly better absorption, indicating superior in vivo performance. This advancement could be crucial for repositioning niclosamide as a potential treatment option for cancers and other diseases beyond its current use as an anthelmintic.
Conclusion
This research demonstrates the successful enhancement of solubility, dissolution, and oral bioavailability of niclosamide through solid SNEDDS and surface-coated microspheres. These formulations hold great promise for repositioning niclosamide as a therapy for various ailments, improving both clinical efficacy and patient outcomes. The study underscores the importance of advanced drug delivery systems in addressing the challenges associated with poorly soluble drugs.
As we continue to explore innovative formulations, we may see a significant paradigm shift in how we approach treatments using previously underutilized drugs. These findings open up new avenues for research and development in pharmaceutics, potentially benefiting millions of patients worldwide.
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