Loratidine and Pseudo-ephedrine in a Time-Release Tablet on a Thermo Scientific ™ Acclaim™ PolarAdvantage (PA) Column

Significance of the Topic

The combination of loratadine and pseudo-ephedrine in a time-release tablet offers comprehensive relief from allergy symptoms by merging antihistamine and decongestant effects. Rapid and accurate quantification of both components is essential for quality control and regulatory compliance in pharmaceutical manufacturing.

Objectives and Study Overview

This study aims to establish a fast and robust HPLC method for simultaneous determination of loratadine and pseudo-ephedrine in a time-release formulation. The focus lies on overcoming challenges related to differing hydrophobicities and peak tailing of basic amines.

Methodology and Instrumentation

Sample preparation and chromatographic separation were optimized to achieve reliable quantification.

• Sample Preparation
  • Finely grind the tablet and weigh an aliquot containing 1 mg loratadine into a 100 mL flask
  • Add 10 mL methanol, disperse, then add 3 mL 1 N HCl
  • Dilute to 100 mL with water and filter through a 0.45 µm membrane
• Chromatographic Conditions
  • Column: Thermo Scientific Acclaim PolarAdvantage C16, 5 µm, 4.6 × 50 mm
  • Mobile phases: A – 15:85 acetonitrile:water with 0.05% TFA; B – 40:60 acetonitrile:water with 0.05% TFA
  • Gradient: hold 100% A for 0.40 min, switch to 100% B by 0.41 min, maintain to 4.00 min
  • Flow rate: 1.25 mL/min; Column temperature: 35 °C; Injection volume: 10 µL
• Detection
  • Diode array detection at 206, 240 and 257 nm

Main Results and Discussion

The method achieved baseline separation of pseudo-ephedrine and loratadine in under 4 minutes. Peak symmetry was excellent, and retention times were highly reproducible. The polar-embedded column effectively minimized tailing of the basic amines across the gradient range.

Benefits and Practical Applications

• Complete analysis in less than 4 minutes enhances laboratory throughput
• Robust peak shape and minimal tailing support reliable quantification
• Applicable for routine quality control of combined antihistamine-decongestant products

Future Trends and Opportunities

Advances in stationary phase design and mobile phase additives may further reduce analysis time and improve peak performance. The approach can be extended to other multi-component dosage forms and automated workflows in high-throughput environments.

Conclusion

The developed HPLC method using the Acclaim PolarAdvantage column provides a rapid, accurate, and reproducible technique for the simultaneous determination of loratadine and pseudo-ephedrine in time-release tablets, meeting stringent quality control requirements.

Reference

Thermo Fisher Scientific Application Note 21785, 2009