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Desorption electrospray ionization DESI is an ambient ionization technique that can be coupled to mass spectrometry for chemical analysis of samples at atmospheric conditions. Coupled Ionization sources-MS systems are popular in the chemical analysis because the individual capabilities of various sources combined with different MS systems allow for chemical determinations of samples. DESI employs a fast-moving charged solvent stream, at an angle relative to the sample surface, to extract analyses from the surfaces and propel the secondary ions toward the mass analyzer. Both DESI and direct analysis in real time DART have been largely responsible for the rapid growth in ambient ionization techniques, with a proliferation of more than thirty new techniques being found today. Electrospray ionization with mass spectrometry was reported by Malcolm Dole in , [7] but John Bennett Fenn was awarded a nobel prize in chemistry for the development of ESI-MS in the late s. One in particular, due to increasing studies into optimization of DESI is, Nanospray desorption electrospray ionization. In this technique the analyte is desorbed into a bridge formed via two capillaries and the analysis surface.
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