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  • detection
  • Sandia National Laboratories scientists Scott Skeen, left, Nils Hansen, center, and Brian Adamson discuss tandem mass spectrometry, which was used for the detection of aliphatically linked polycyclic aromatic hydrocarbons found in soot producing flames. (phys.org)
  • spectra
  • A flame that was sampled by Sandia National Laboratories scientists against the backdrop of mass spectra and polycyclic aromatic hydrocarbon compounds found inside the flame. (phys.org)
  • involves
  • Tandem MS in space uses the coupling of two instrument components which measure the same mass spectrum range but with a controlled fractionation between them in space, while tandem MS in time involves the use of an ion trap. (wikipedia.org)
  • Protein
  • Annexin A1 protein has an apparent relative molecular mass of 40 kDa with phospholipase A2 inhibitory activity. (wikipedia.org)
  • spectrum
  • Tandem in time MS instruments do not use the modes described next, but typically collect all of the information from a precursor ion scan and a parent ion scan of the entire spectrum. (wikipedia.org)
  • This produces a mass spectrum of the CID fragments from which structural information or identity can be gained. (wikipedia.org)
  • introduction
  • Whilst working here, I've seen the introduction of mass spectrometry for an expanding compendium of metabolic disorders, so the technology has really come to fruition over the past decade, enabling us to detect rare conditions that can be treated and managed in a timely fashion. (selectscience.net)
  • ratio
  • The filters can be used in static or scanning mode to select a particular mass-to-charge (m/z) ratio or m/z range. (aacc.org)
  • fragments
  • The fragments are then accelerated out of the collision cell and enter Q3 which scans through the mass range, analyzing the resulting fragments (as they hit a detector). (wikipedia.org)
  • stage
  • In a product ion scan, a precursor ion is selected in the first stage, allowed to fragment and then all resultant masses are scanned in the second mass analyzer and detected in the detector that is positioned after the second mass analyzer. (wikipedia.org)
  • precursor
  • On the other hand, MS/MS has superior selectivity for many analytes since it recognizes them by at least two physical properties-their precursor and product ion mass. (aacc.org)
  • For a precursor ion scan, the product ion is selected in the second mass analyzer, and the precursor masses are scanned in the first mass analyzer. (wikipedia.org)
  • method
  • The method uses two mass filters arranged sequentially with a collision cell between them. (aacc.org)
  • A fast GC with tandem MS method was developed and validated for multiresidue determination of 95 chemical contaminants (24 synthetic pyrethroids, 17 organochlorines, 17 organophosphorus compounds, 18 polycyclic aromatic hydrocarbons, and 19 polychlorinated biphenyls) in Indian prawns ( Fenneropenaeus indicus ) as per the European Union maximum residual limit requirements. (ingentaconnect.com)
  • Results
  • Comparison of results obtained using sector-quadrupole hybrids with those from tandem double focusing instruments. (springer.com)
  • modes
  • When tandem MS is performed with an in space design, the instrument must operate in one of a variety of modes. (wikipedia.org)