A cylindrical capacitor ionization source: droplet generation and controlled charge reduction for mass spectrometry

Area of Science:

• Analytical Chemistry
• Mass Spectrometry
• Ionization Techniques

Background:

• Traditional mass spectrometry often struggles with analyzing complex biological molecules due to multiply charged ions.
• Existing ionization sources can be complex or limited in their applicability to diverse sample types.

Purpose of the Study:

• To develop a simple and effective ionization source for generating singly charged ions for mass spectrometry.
• To enable the analysis of biomolecules such as DNA and proteins by simplifying their charge states.

Main Methods:

• Utilized a cylindrical capacitor ionization source with a fused-silica capillary and platinum wire.
• Employed corona discharge for charge reduction of ions.
• Investigated the modulation of voltage for controlling ion charge states.

Main Results:

• Successfully generated a continuous stream of ions from aqueous solutions.
• Achieved predominantly singly charged ions through corona discharge charge reduction.
• Demonstrated the ability to switch between multiply and singly charged ion production by adjusting corona discharge voltage.

Conclusions:

• The developed ionization source offers a straightforward method for producing singly charged ions.
• This technique facilitates the mass spectrometric analysis of DNA and protein mixtures.
• The simple construction and operation make this a valuable tool for various analytical applications.