Zeta potential

Apremilast, an oral phosphodiesterase-4 (PDE-4) inhibitor, is widely used in the treatment of inflammatory diseases such as psoriasis and psoriasis arthritis. However, its poor water solubility to formulate and evaluate a Nanoemulsion (NE) system for Apremilast to enhance its solubility, stability, and bioavailability. A Nanoemulsion was developed using a high energy emulsification method, with a combination of oil, surfactant, and co-surfactant carefully selected based on solubility studies and construction of pseudo-ternary phase diagrams. Various formulations were prepared and evaluated for droplet size, polydispersity index (PDI), zeta potential, and drug encapsulation efficiency. The optimized formulation exhibited a droplet size of below 600 nm, a low PDI, and a stable zeta potential, confirming its stability. According to this report, the Nanoemulsion based delivery system for Apremilast drug could offer significant clinical advantages, particularly in terms of improved pharmacokinetics and enhanced therapeutics outcomes, paving the way for more effective treatment of inflammatory diseases such as psoriasis and psoriatic arthritis. Further in vivo studies are recommended to confirm the observed benefits and to evaluate long term safety and efficacy.

In this present work Erythromycin stearate nanosuspension has been formulated. Since Erythromycin stearate is insoluble in water, it has been formulated as nanosuspension to improve bioavailability of the drug. The formulation was carried out using High Pressure Homogenization method using different variables like drug-surfactants ratio, stirring speed and rotation time, to optimize the final formulation while keeping the quantities of active ingredient constant. An optimized final formulation was prepared by using drug, poloxamer 188 and tween20 in 1:2:2 ratios with stirring speed of 25000 rpm for 25 minutes using High Pressure Homogenizer (Polytron PT 1600E) followed by lyophilisation. The optimized final formulation was subjected to in-vitro parameters such as compatibility, drug content, particle size analysis, zeta-potential, SEM, in-vitro release profile. All the in vitro evaluation parameters complied the limits. Stability studies were also conducted as per ICH guidelines and from the result it may be concluded that the optimized formulation is stable. Finally, it is concluded that the drug is compatible and stable with the excipients, hence Erythromycin stearate can be formulated as nanosuspension by this method. Key words: Erythromycin stearate, Poloxamer 188, Nanosuspension, Zeta potential, DSC, SEM.