Derringer desirability and kinetic plot LC-column comparison approach for MS-compatible lipopeptide analysis.

Area of Science:

• Analytical Chemistry
• Chromatography
• Mass Spectrometry

Background:

• Lipopeptides are a significant class of compounds with diverse pharmaceutical applications, including antibacterial, antifungal, antiviral, and antitumor activities.
• Traditional chromatographic analysis of lipopeptides is challenging due to their structure, often requiring specialized buffers or trifluoroacetic acid, which can interfere with mass spectrometry detection.
• Developing robust and efficient separation methods is crucial for the accurate analysis and quality control of lipopeptides.

Purpose of the Study:

• To evaluate the performance of different C18 columns for mass spectrometry (MS)-compatible separation of pharmaceutically relevant lipopeptides.
• To compare two distinct evaluation approaches: the Derringer desirability function and the kinetic plot approach.
• To identify optimal chromatographic conditions and columns for reliable lipopeptide analysis.

Main Methods:

• Four C18 columns, including one UPLC column, were tested for separating four lipopeptides (polymyxin B1, caspofungin, daptomycin, gramicidin A1) using an aqueous/acetonitrile gradient with formic acid.
• The Derringer desirability function was employed to consolidate multiple chromatographic responses into a single desirability value (D-value) for each column.
• The kinetic plot approach, utilizing the length elongation factor (λ), was used to compare column performance across different flow rates by constructing kinetic performance limit (KPL) curves.

Main Results:

• The YMC Pack Pro C18 column was identified as the best for general MS-compatible lipopeptide separation using the Derringer desirability function.
• The YMC Triart C18 UPLC and ACE C18 columns showed the best performance when evaluated using the kinetic plot approach and KPL curves.
• Both evaluation methods provided valuable, albeit different, insights into column performance for lipopeptide analysis.

Conclusions:

• Specific C18 columns, such as YMC Pack Pro C18 and YMC Triart C18 UPLC, are highly suitable for MS-compatible lipopeptide separation.
• The choice of evaluation method (Derringer desirability vs. kinetic plot) influences the ranking of column performance.
• These findings aid in selecting appropriate chromatographic tools for the analysis of lipopeptides in pharmaceutical research and development.