Quantification and In Silico Toxicity Assessment of Nimesulide and its Related Substances

Area of Science:

• Pharmaceutical Analysis
• Analytical Chemistry
• Drug Development

Background:

• Accurate identification and quantification of impurities are crucial for pharmaceutical product development.
• Existing analytical methods may not be compatible with advanced techniques like UHPLC and LC-MS.
• Nimesulide impurity profiling requires robust and validated analytical approaches.

Purpose of the Study:

• To develop and validate a novel Ultra High Performance Liquid Chromatography (UHPLC) method for the identification and quantification of impurities in Nimesulide.
• To ensure the method's compatibility with Liquid Chromatography Mass Spectrometry (LC-MS) for comprehensive impurity analysis.
• To assess the genotoxicity and toxicological profile of Nimesulide impurities.

Main Methods:

• Development of a UHPLC method using a fused core column with ammonium acetate and methanol as the mobile phase.
• Application of Quality-by-Design (QbD) principles to identify critical method parameters and define the design space.
• Validation of the method according to International Conference on Harmonization (ICH) Q2(R1) guidelines, including specificity, linearity, accuracy, precision, and robustness.
• Toxicological assessment of impurities using Derek and TOPKAT software based on ICH M7 guidelines.

Main Results:

• The developed UHPLC method demonstrated excellent sensitivity with a Limit of Detection (LOD) of 0.025% and a Limit of Quantification (LOQ) of 0.075%.
• High precision (<0.4% RSD) and linearity (correlation coefficient >0.999) were achieved for Nimesulide and its related substances.
• Accurate quantification of Nimesulide was confirmed, with results ranging from 99.3% to 100.4%.
• The method was successfully applied to stability analysis of stressed samples.

Conclusions:

• This study reports the first UHPLC method for Nimesulide and related substances estimation, offering an advantage for drug product development.
• The validated analytical method, combined with toxicological assessments, supports the development of safe and high-quality Nimesulide products.
• The integrated approach of analytical method development and toxicology assessment is essential for comprehensive drug safety evaluation.