Analytical Quality by Design Based Method Development for the Analysis of Cold and Cough Formulations

Importance of the Topic

Understanding and controlling the quality of analytical methods for cold and cough formulations is essential due to their complex composition and the need for accurate dosage of multiple APIs.

Objectives and Study Overview

This study applied Analytical Quality by Design (AQbD) principles to develop a single HPLC method capable of separating and quantifying six APIs in various cold and cough syrups. The goals included reducing analysis time, minimizing solvent waste, and ensuring robust performance across multiple formulations.

Methodology and Instrumentation

Methods were developed using a systematic AQbD workflow that combined risk assessment, design of experiments, and software‐guided optimization.

• Instrument: Arc Premier UHPLC System with Quaternary Solvent Manager, Column Manager, and solvent select valve for automated condition screening; QDa Mass Detector for peak identification.
• Columns screened: CORTECS Premier C18, C18+, T3, and Phenyl columns (2.1×100 mm, 2.7 µm).
• Design of experiments (DOE): Gradient time, temperature, and column chemistry were varied to meet Analytical Target Profile criteria (resolution ≥4, tailing ≤1.5).

Main Results and Discussion

Optimal separation was achieved on the C18+ column at 45 °C with a 9-minute gradient, providing baseline resolution for all APIs. Verification runs confirmed predicted retention times, peak areas, and tailing factors. Spiking studies with potassium sorbate at 20–100 % levels demonstrated method robustness against excipient variations. Application to four commercial syrup formulations showed consistent resolution and spectral purity below threshold angles for all analytes.

Benefits and Practical Applications

• Single-run analysis reduces total run time and solvent consumption by eliminating separate assays for each API.
• Improved method consistency and reliability through AQbD risk control and systematic optimization.
• Adaptable to routine quality control and stability testing of multi-component cold and cough products.

Future Trends and Potential Applications

The integration of AQbD with automated software tools is expected to expand to other complex formulations. Advances in mass detection and data analytics will further enhance method robustness and reduce development timelines. Potential extensions include real-time monitoring, PAT implementations, and AI-driven optimization platforms.

Conclusions

This work demonstrates that an AQbD approach, supported by Fusion QbD software and UHPLC-QDa instrumentation, can efficiently develop a single, robust method for comprehensive analysis of cold and cough formulations. The resulting method meets stringent performance criteria and shows excellent adaptability to different matrix conditions.

References

• T. Dongala et al., Biomed Chromatogr, 2019, 33(11), e4641
• F. Alkhateeb et al., Waters Application Note 720006287
• M. Maziarz, P. Rainville, Waters Application Note 720006523