L14_CHEM480_JCCYu - DESI Desorption Electro Spray...

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DESI
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Desorption Electro Spray Ionization
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DART (Direct Analysis in Real Time) This process is referred to as Penning ionization: A reaction between an excited-state neutral atom (or molecule M*) and a substrate S that has an ionization potential with a lower energy than the internal energy of the excited-state species, resulting in the formation of a substrate radical molecular cation S+ . and an electron e- http://jeolusa.com/tabid/230/Default.aspx http://www.ionsense.com/index.php
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DART / time-of-flight mass spectrum of a red ink
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DART Features No solvents or sample preparation required The DART source ionizes almost anything you put in front of it Solutions straight from your synthetic reaction pot Crude extracts Unknown pills or powders Sticky liquids Vapors TLC plates http://www.jeolusa.com/SERVICESUPPORT/ApplicationsResources/AnalyticalI nstruments/ProductPresentations/tabid/341/Default.aspx
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Potential Applications in Trace Analysis Drug and pharmaceutical Confiscated samples, Endogenous drugs, Drug residues on surfaces Fingerprints Bodily fluidcs Condom lubricants Dyes Self-defense sprays, currency-pack dyes Explosives Arson accelerants Chemical warfare agents Glues, Plastics, Fibers, Inks. .
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9 Chromatography The mobile phase: The solvent moving through the column can be liquid or gas The stationary phase: The phase stays in place inside the column A viscous liquid or phase: chemically bonded to the inside of a capillary tube Or bonded onto the surface of solid particles packed in the column Separation: the partitioning of solutes between mobile and stationary phase.
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10 Eluent : fluid entering the column Eluate
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This note was uploaded on 04/02/2009 for the course CHM 480 taught by Professor Yu during the Spring '09 term at Sam Houston State University.

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L14_CHEM480_JCCYu - DESI Desorption Electro Spray...

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