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Particle discriminator interface for nanoflow ESI-MS.
Bradley B Schneider1, Vladimir I Baranov, Hassan Javaheri
1MDS SCIEX, Concord, Ontario, Canada. bradley.schneider@sciex.com
Journal of the American Society for Mass Spectrometry
|November 5, 2003
Summary
A novel atmosphere to vacuum interface enhances electrospray ionization-mass spectrometry by efficiently transmitting ions and deflecting unwanted particles. This design improves ion signal and stability for cleaner, more reliable mass spectrometry analysis.
Area of Science:
- Analytical Chemistry
- Mass Spectrometry
Background:
- Electrospray ionization-mass spectrometry (ESI-MS) faces challenges with particle transmission and system stability, especially at low flow rates.
- Large charged and neutral particles, along with non-desolvated droplets, can contaminate vacuum systems and reduce signal quality.
Purpose of the Study:
- To design and implement an atmosphere to vacuum interface for ESI-MS that improves ion transmission efficiency.
- To deflect large charged and neutral particles, maintaining vacuum system cleanliness and stability.
- To enhance desolvation and ion production for more stable ion currents.
Main Methods:
- Utilized differential mobility and momentum characteristics of particles at the atmosphere-vacuum interface.
- Incorporated a particle discriminator space with potential gradients to divert large particles.
- Employed a counter-current flow of drying gas to deflect neutral particles and solvent vapor.
- Integrated a heated laminar flow chamber for enhanced desolvation.
Main Results:
- Achieved approximately a 2-fold improvement in ion count rates.
- Demonstrated a 3-fold improvement in signal stability (relative standard deviation).
- Eliminated issues of solution boiling in nanospray tips near heated inlets.
Conclusions:
- The developed particle discriminator interface significantly enhances ion transmission and stability in ESI-MS.
- This interface is particularly beneficial for low flow rate ESI-MS applications.
- The design contributes to cleaner, more robust, and efficient mass spectrometry analyses.