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DIRECT IMPACT CORONA IONIZATION OF BACTERIA FOR RAPID, REPRODUCIBLE IDENTIFICATION VIA SPECTRAL PATTERN RECOGNITION.
- Source :
-
AIP Conference Proceedings . 6/10/2011, Vol. 1326 Issue 1, p128-134. 7p. 1 Diagram, 7 Graphs. - Publication Year :
- 2011
-
Abstract
- A novel atmospheric pressure ionization process, Direct Impact Corona Ionization (DICI), is described here. In this process, a corona impinges onto the flat surface of a stainless steel pin carrying a thin film of dried bacterial suspension, the analyte. Two electrodes-a corona electrode and the sample pin-are immersed in hot inert He gas flux, flowing past them towards a 0.4 mm orifice leading to a mass spectrometer analyzer. An electric potential of 1.5-3.0 kV is placed between the two. At distances less than 1 cm, an intermittent arc is formed. At approximately 4 mm, the arc becomes a continuous corona discharge (plasma). The plasma is hot enough to: A) locally melt the impact zone on the steel pin, and B) ablate the dry thin bacterial film deposited on the metal pin. Biomolecular ions as heavy as 790 m/z are generated. Mass spectral fingerprints of bacteria are obtained with a high degree of reproducibility by selecting the highest intensity of an 'indicator ion', 560.5 m/z or another relatively heavy ion whose appearance signals efficient vaporization of low volatility components. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0094243X
- Volume :
- 1326
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- AIP Conference Proceedings
- Publication Type :
- Conference
- Accession number :
- 61468351
- Full Text :
- https://doi.org/10.1063/1.3587468