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Rectilinear ion trap mass spectrometer with atmospheric pressure interface and electrospray ionization source
Qingyu Song1, Sameer Kothari, Michael A Senko
1Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, USA.
Analytical Chemistry
|February 2, 2006
Summary
This study introduces a rectilinear ion trap (RIT) mass spectrometer for analyzing biological compounds and pharmaceuticals. The RIT instrument demonstrates high resolution, accuracy, and efficient collision-induced dissociation (CID) for complex mixture analysis.
Area of Science:
- Analytical Chemistry
- Mass Spectrometry
- Biochemistry
Background:
- Development of advanced mass spectrometry instruments is crucial for analyzing complex biological and pharmaceutical samples.
- Rectilinear ion traps (RIT) offer potential advantages in mass analysis due to their geometry and trapping capabilities.
Purpose of the Study:
- To incorporate a rectilinear ion trap (RIT) mass analyzer into a mass spectrometer with electrospray ionization (ESI).
- To characterize the performance of the ESI-RIT instrument for analyzing biological compounds, peptides, proteins, and pharmaceutical drugs.
- To evaluate and enhance the analytical capabilities, including resolution, accuracy, and collision-induced dissociation (CID).
Main Methods:
- Assembled a mass spectrometer with an ESI source, atmospheric pressure interface, and RIT mass analyzer in two configurations.
- Employed techniques such as balanced radio frequency (rf), elevated background gas pressure, automatic gain control, and dynamic resonance ejection waveforms.
- Characterized performance using proteins, peptides, pharmaceutical drugs, and analyzed a mixture of pharmaceutical compounds via multi-stage mass spectrometry.
Main Results:
- Achieved unit resolution and accuracy better than m/z 0.2 for m/z ratios up to 2000 Th at a scan rate of ~3000 amu/(charge.s).
- Optimized low mass cutoff (m/z 120-140) for equal trapping efficiencies and measured radial detection efficiency rising to >90% at m/z 1800.
- Demonstrated high overall CID efficiencies (>60%) and selective ion isolation (>95% rejection) at m/z 524.
Conclusions:
- The ESI-RIT instrument provides high performance for analyzing a wide range of analytes, including complex biological and pharmaceutical mixtures.
- Optimized trapping parameters and advanced waveform techniques significantly enhance the instrument's capabilities.
- The RIT mass spectrometer is a versatile tool for multi-stage mass spectrometry applications, offering excellent resolution, accuracy, and dissociation efficiency.