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J Am Soc Mass Spectrom

Title:		A new matrix assisted ionization method for the analysis of volatile and nonvolatile compounds by atmospheric probe mass spectrometry
Author(s):		Chakrabarty S; Pagnotti VS; Inutan ED; Trimpin S; McEwen CN;
Address:		"University of the Sciences, Philadelphia, PA, USA"
Journal Title:		J Am Soc Mass Spectrom
Year:		2013
Volume:		20130510
Issue:		7
Page Number:		1102 - 1107
DOI:		10.1007/s13361-013-0634-9
ISSN/ISBN:		1879-1123 (Electronic) 1044-0305 (Linking)
Abstract:		"Matrix assisted ionization of nonvolatile compounds is shown not to be limited to vacuum conditions and does not require a laser. Simply placing a solution of analyte dissolved with a suitable matrix such as 3-nitrobenzonitrile (3-NBN) or 2,5-dihydroxyacetophenone on a melting point tube and gently heating the dried sample near the ion entrance aperture of a mass spectrometer using a flow of gas produces abundant ions of peptides, small proteins, drugs, and polar lipids. Fundamental studies point to matrix-mediated ionization occurring prior to the entrance aperture of the mass spectrometer. The method is analytically useful, producing peptide mass fingerprints of bovine serum albumin tryptic digest consuming sub-picomoles of sample. Application of 100 fmol of angiotensin I in 3-NBN matrix produces the doubly and triply protonated molecular ions as the most abundant peaks in the mass spectrum. No carryover is observed for samples containing up to 100 pmol of this peptide. A commercial atmospheric samples analysis probe provides a simple method for sample introduction to an atmospheric pressure ion source for analysis of volatile and nonvolatile compounds without using the corona discharge but using sample preparation similar to matrix-assisted laser desorption/ionization"
Keywords:		"Animals Atmospheric Pressure Cattle Chemistry Techniques, Analytical/*methods Lipids/chemistry Nitriles Nitrobenzenes Peptide Fragments/chemistry Peptide Mapping/methods Pharmaceutical Preparations/chemistry Serum Albumin, Bovine/chemistry Spectrometry, M;"
Notes:		"MedlineChakrabarty, Shubhashis Pagnotti, Vincent S Inutan, Ellen D Trimpin, Sarah McEwen, Charles N eng 2013/05/11 J Am Soc Mass Spectrom. 2013 Jul; 24(7):1102-7. doi: 10.1007/s13361-013-0634-9. Epub 2013 May 10"