Science and Engineering Services, Inc. | Date: 2010-05-21
A method for fragmentation of analyte ions for mass spectroscopy and a system for mass spectroscopy. The method produces gas-phase analyte ions, produces gas-phase odd-electron containing species separately from the analyte ions, and mixes the gas-phase analyte ions and the odd-electron containing species at substantially atmospheric pressure conditions to produce fragment ions prior to introduction into a mass spectrometer. The system includes a gas-phase analyte ion source, a gas-phase odd-electron containing species source separate from the gas-phase analyte ion source, a mixing region where the gas-phase analyte ions and the odd-electron containing species are mixed at substantially atmospheric pressure to produce fragment ions of the analyte ions, a mass spectrometer having an entrance where at least a portion of the fragment ions are introduced into a vacuum of the mass spectrometer, and a detector in the mass spectrometer which determines a mass to charge ratio analysis of the fragment ions.
Science and Engineering Services, Inc. | Date: 2011-09-16
A liquid chromatography interface is provided having an integrated column/ESI tip assembly including a liquid chromatography separation column, an ESI tip for generating ions having at least one emitting channel, and a temperature-controlled enclosure surrounding the liquid chromatography separation column. The enclosure has at least one opening and the ESI tip is exposed outside the enclosure through the opening. The enclosure has a heating or cooling device providing a substantially homogeneous distribution of temperature throughout an internal space of the enclosure where the liquid chromatography separation column is disposed. The enclosure includes at least one gas flow mixing element to permit heat exchange by directing a flow of gas toward the ESI tip. The integrated column/ESI tip assembly resides within a thermo-stabilized volume of substantially the same temperature from an entrance of the liquid chromatography separation column to the outlet of the ESI tip.
Agency: Department of Defense | Branch: Office for Chemical and Biological Defense | Program: SBIR | Phase: Phase II | Award Amount: 749.99K | Year: 2009
We propose to build in Phase II a compact, rugged laser photoacoustic spectrometric (L-PAS) prototype sensor system (at technology readiness level TRL-6) for continuous, real-time broadband analysis of multiple chemicals. It will incorporate a tunable infrared quantum cascade laser (QCL), photoacoustic cell and air sampler system in a sealed decontamination-capable module and an efficient algorithm for rapid high sensitivity, multi-component CW agent measurements in under a minute. In Phase I we have utilized a laboratory L-PAS instrument to successfully demonstrate feasibility through CWA simulant measurements in clean dry air and with multiple interferents. Several developments crucial for building compact field-usable sensor were completed, including: room temperature continuous-wave QCL in 9.5-10.5µm range with >100mW output; single mode operation; mode-hop-free multi-step laser tuning over ~700nm wavelength range in
Agency: Department of Health and Human Services | Branch: | Program: SBIR | Phase: Phase I | Award Amount: 200.00K | Year: 2009
DESCRIPTION (provided by applicant): The primary objective of this proposal is to develop a novel electrospray ion source operating inside the mass spectrometer, based on internal heating of small droplets and water clusters. The use of internal heating (contrary to external one by ambient gas) of micro-droplets will allow using electrospray at reduced pressures inside the mass spectrometer. Such an introduction of ions will be much more efficient compared to conventional one which uses atmospheric pressure-vacuum interface. The efficient desolvation by internal heating, the absence of ion loss pertinent to conventional atmospheric pressure-vacuum interfaces, and elimination of the chemical noise originated from chemical impurities present in the ambient air are expected to substantially increase the sensitivity of the ESI-MS. PUBLIC HEALTH RELEVANCE: The application of mass spectrometry as a proteomics tool plays an important role in modern basic science, drug discovery and clinical applications. A novel electrospray ion source with enhanced sensitivity will further increase the speed and specificity of protein analysis.
Science and Engineering Services, Inc. | Date: 2010-04-07
A measuring cell of an ICR mass spectrometer and a method of operating a measuring cell of the ICR mass spectrometer. The method and system trap ions in a first compartment of the ICR measuring cell by generating an electric potential well in the direction of the magnetic field with a minimum of the electric potential well located inside the first compartment. The method and system excite cyclotron motion of the ions trapped in the first compartment. The method and system transfer at least a part of the excited ions from the first compartment to a second compartment of the ICR measuring cell by displacement of a position of the minimum of the electric potential well from the first compartment to the second compartment. The ions are transferred by displacing the position of the minimum of the electric potential well from the first compartment to the second compartment preferably over a period of time equal to or longer than a characteristic period of ion oscillations along the direction of the magnetic field in the electric potential well. The method and system detect ion cyclotron motion of at least a part of the ions in the second compartment.