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Stability-Indicating HPLC-UV Method for Semaglutide Impurity Analysis

By 03.16.2026

As demand for GLP-1 receptor agonists like semaglutide continues to rise, analytical laboratories must ensure accurate impurity profiling, regulatory compliance, and long-term method robustness. A new Thermo Fisher Scientific application note presents a powerful stability-indicating HPLC-UV method for semaglutide analysis using the Thermo Scientific Vanquish Flex UHPLC system and Thermo Scientific Hypersil GOLD Peptide column.

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Built for peptide impurity challenges

Peptide-related impurities are notoriously difficult to separate due to their structural similarity to the parent compound. To address this, semaglutide samples were subjected to thermal and oxidative stress conditions, generating controlled degradation levels to fully challenge the method.

The result? A robust analytical workflow capable of resolving closely eluting impurities with confidence.

Optimized for maximum resolution

Careful optimization of column temperature and gradient conditions significantly improved separation. Increasing the column temperature to 55 °C enhanced resolution between semaglutide and critical impurities, demonstrating the importance of precise thermal control.

Gradient refinement further improved selectivity while maintaining strong sensitivity which is critical for reliable impurity detection in peptide therapeutics.

Superior performance with TFA

The study also compared mobile phase additives. While formic acid (FA) is common in LC-MS workflows, trifluoroacetic acid (TFA) delivered sharper peaks and improved chromatographic resolution for HPLC-UV analysis. Peak width at 50% height decreased from 0.83 min with FA to 0.32 min with TFA, dramatically enhancing sensitivity.

Proven reproducibility for routine QC

Method robustness was confirmed across three different column lots, with %RSD values ≤1.3% for all critical performance parameters.

This level of consistency supports reliable transfer into quality control and regulated laboratory environments.

Advance your semaglutide analysis

Whether you are developing generic GLP-1 formulations, supporting regulatory submissions, or optimizing peptide impurity methods, this application note provides practical, data-driven guidance.

Download the application note, Stability-indicating HPLC-UV method development for GLP-1 receptor analogue semaglutide to explore the full method details, chromatographic data, and reproducibility results.

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Lizzie Gallagher

Lizzie Gallagher is a market development manager for the pharma and biopharma market at Thermo Fisher Science, having spent a number of years in both industry, and sales and marketing. Lizzie has widespread experience with the challenges and trends of the biopharma and pharma market.