Enhancing Tandem MS Sensitivity and Peptide Identification via Ion Preaccumulation in an Orbitrap Mass Spectrometer

Area of Science:

• Proteomics
• Analytical Chemistry
• Mass Spectrometry

Background:

• High-throughput mass spectrometry-based proteomics is crucial for academic and industrial research.
• Faster analysis requires enhanced scanning speed and sensitivity in mass spectrometers.
• Orbitrap instruments face limitations in scan speed due to ion accumulation and transient length.

Purpose of the Study:

• To introduce a new scanning strategy to overcome limitations in Orbitrap mass spectrometer speed.
• To improve ion beam utilization and enable faster scanning rates.
• To enhance peptide and protein identification and sensitivity in high-throughput applications.

Main Methods:

• Development and implementation of a preaccumulation scanning strategy.
• Parallel ion storage in the bent flatapole during C-trap/IRM operation.
• Coupling preaccumulation with increased scan speeds and full mass range phase-constrained spectrum deconvolution method (ΦSDM).

Main Results:

• Achieved scanning speeds of approximately 70 Hz on hybrid Orbitrap instruments.
• Significantly improved peptide and protein group identifications for short liquid chromatography gradients.
• Enhanced sensitivity for high-throughput proteomics applications, especially with reduced signal input.

Conclusions:

• The preaccumulation strategy effectively increases Orbitrap mass spectrometer speed and performance.
• This method enhances data quality and throughput for proteomics studies.
• No hardware modifications are required, making it broadly applicable to Orbitrap instruments using fast MS/MS acquisition.