Study of nimesulide release from solid pharmaceutical formulations in tween 80 solutions

Area of Science:

• Pharmaceutical Sciences
• Drug Delivery
• Physical Chemistry

Background:

• Nimesulide, a non-steroidal anti-inflammatory drug (NSAID), exhibits poor aqueous solubility (≈ 0.01 mg/mL).
• As a BCS 2 drug (poorly soluble, highly permeable), Nimesulide presents formulation challenges impacting bioavailability.
• Surfactant-based solubilization above critical micelle concentration (CMC) is a strategy for poorly soluble drugs.

Purpose of the Study:

• To enhance the aqueous solubility of Nimesulide using varying concentrations of Tween 80 in a pH 7.4 buffer.
• To understand the relationship between Tween 80 concentration and Nimesulide solubility for improved pharmaceutical formulation.

Main Methods:

• Solubilization of Nimesulide in aqueous buffer (pH 7.4) with different concentrations of Tween 80.
• Analysis of Nimesulide solubility and release characteristics at various surfactant concentrations.

Main Results:

• Nimesulide solubility dependence on Tween 80 concentration was non-linear.
• A decrease in apparent solubility was observed at very low Tween 80 concentrations, possibly linked to CMC.
• Potential analytical artifacts, such as Nimesulide precipitation or colloidal formation, require further investigation.

Conclusions:

• Tween 80 can increase Nimesulide solubility, but the relationship is complex and concentration-dependent.
• The observed non-linear behavior and potential precipitation at low concentrations necessitate careful formulation design.
• Further research is needed to elucidate the mechanisms behind Nimesulide-Tween 80 interactions and optimize formulation strategies.