Enhancing performance of liquid sample desorption electrospray ionization mass spectrometry using trap and capillary columns

- Coupling of liquid sample DESI-MS detection with trap cartridge column for trace amount drug enrichment and detection.
- Coupling of liquid sample DESI-MS detection with trap cartridge column for desalting and enrichment.
- Coupling of liquid sample DESI-MS detection with on-column protein digestion for fast shot-gun analysis.