Hybrid Quadrupole Mass Filter - Radial Ejection Linear Ion Trap and Intelligent Data Acquisition Enable Highly...

Area of Science:

• Biochemistry
• Analytical Chemistry
• Mass Spectrometry

Background:

• Targeted mass spectrometry (MS) methods, including selected reaction monitoring (SRM) and parallel reaction monitoring (PRM), are crucial for sensitive peptide analysis in clinical settings.
• Current SRM and PRM methods face limitations in throughput and scalability, restricting their use to assays with fewer than 100 targets.

Purpose of the Study:

• To introduce a novel MS platform designed for high-throughput, multiplexed targeted peptide analysis.
• To overcome the throughput limitations of existing SRM and PRM techniques for large-scale clinical assays.

Main Methods:

• Development of a new MS platform featuring a quadrupole mass filter, collision cell, and linear ion trap architecture.
• Implementation of high acquisition rates (70-100 Hz) and real-time chromatogram alignment for scheduled acquisition.
• Utilization of the Skyline software tool for targeted method development using data-independent acquisition libraries or heavy-labeled standards.

Main Results:

• The new platform achieves significantly increased acquisition rates, enabling the targeting of 5000 to 8000 peptides per hour.
• Demonstrated approximately 10x lower limit of quantification (LOQ) compared to traditional SRM analysis in a highly multiplexed assay.
• Evaluated the impact of varying method duration and analyte number on analytical figures of merit.

Conclusions:

• The developed MS platform offers a substantial advancement in targeted proteomics, facilitating high-multiplexing capabilities previously unattainable with SRM or PRM.
• This technology holds promise for expanding the scope and efficiency of peptide-based diagnostics and biomarker discovery in clinical research.