 Extractive electrospray ionization

Extractive electrospray ionization (EESI) is an ionization technique used in mass spectrometry that allows for the analysis of liquid samples directly without the need for extensive sample preparation. It is particularly useful for analyzing samples in their native liquid state, making it a powerful tool for various fields, including chemistry, biology, and environmental science. In EESI, a sample solution is introduced to an electrospray setup where a high-voltage electric field is applied.