Impact energy measurement in time-of-flight mass spectrometry with cryogenic microcalorimeters
| Autor: | David A. Wollman, Damian Twerenbold, Patrick M. Gillevet, Kent D. Irwin, John M. Martinis, Gene C. Hilton, L L. Dulcie, Daniel Gerber |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Multidisciplinary
Resolution (mass spectrometry) Physics::Instrumentation and Detectors Orders of magnitude (temperature) Chemistry Temperature Analytical chemistry Molecular Probe Techniques Serum Albumin Bovine Cryogenics Calorimetry equipment and supplies Mass spectrometry Computational physics Spectrometry Mass Matrix-Assisted Laser Desorption-Ionization Animals Cryogenic particle detectors Particle Cattle Microchannel plate detector Time-of-flight mass spectrometry |
| Zdroj: | Nature. 391:672-675 |
| ISSN: | 1476-4687 0028-0836 |
| Popis: | Time-of-flight mass spectrometry-most notably matrix-assisted laser-desorption-ionization time-of-flight (MALDI-TOF) spectrometry-is an important class of techniques for the study of proteins and other biomolecules. Although these techniques provide excellent performance for masses up to about 20,000 daltons, there has been limited success in achieving good mass resolution at higher masses. This is because the sensitivity of the microchannel plate (MCP) detectors used in most systems decreases rapidly with increasing particle mass, limiting the utility of MCP detectors for very large masses. It has recently been proposed that cryogenic particle detectors may provide a solution to these difficulties. Cryogenic detectors measure the thermal energy deposited by the particle impact, and thus have a sensitivity that is largely independent of particle mass. Recent experiments have demonstrated the sensitivity of cryogenic particle detectors to single biomolecules, a quantum efficiency several orders of magnitude larger than the MCP detectors, and sensitivity to masses as large as 750,000 daltons. Here we present results demonstrating an order of magnitude better energy resolution than previous measurements, allowing direct determination of particle charge state during acceleration. Although application of these detectors to practical mass spectrometry will require further development of the detectors and cryogenics, these detectors can be used to elucidate the performance-limiting processes that occur in such systems. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|