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  • compounds
  • The detected masses were assigned by matching their accurate mass signals with tomato compounds reported in literature and complemented, as much as possible, by PDA and MS/MS information, as well as by using reference compounds. (plantphysiol.org)
  • The retention indices of both types of methyl ethers on the liquid phase NPGS have been measured and the main directions of the fragmentation of these compounds under electron impact have been determined. (springer.com)
  • time-of-fli
  • Recently, high-resolution mass spectrometry (HRMS) - such as Time-of-Flight (ToF) or Orbitrap instruments - has gained popularity in structure characterization/elucidation due to its inherent capability to provide high resolving power and accurate mass measurement. (ppdi.com)
  • There are a lot of mass analyzers that can be used in LC/MS. Single Quadrupole , Triple Quadrupole , Ion Trap , TOF ( time of Flight ) and Quadrupole-time of flight (Q-TOF). (wikibooks.org)
  • Challenges
  • Not least among these challenges is high fidelity data reduction from raw mass spectral data through peak tables and onto peptide (and protein) specific differentials. (scribd.com)
  • cysteine
  • The bottom-up proteomics LC-MS approach to proteomics generally involves protease digestion and denaturation (usually trypsin as a protease, urea to denature tertiary structure and iodoacetamide to cap cysteine residues) followed by LC-MS with peptide mass fingerprinting or LC-MS/MS (tandem MS) to derive sequence of individual peptides. (wikibooks.org)
  • extraction
  • Chromatograms were processed using software tools for mass signal extraction and alignment, and intensity-dependent accurate mass calculation. (plantphysiol.org)
  • Analytical
  • The AxION® 2 TOF MS offers a broad array of capabilities designed to simplify and streamline virtually any analytical workflow and provides mass accuracy, full spectrum capability, speed, sensitivity, or dynamic range. (perkinelmer.com)
  • phase
  • When combined with MS, LC-MS offers broad sample coverage because different column chemistries, such as reversed phase liquid chromatography, can be used. (thermofisher.com)
  • Understandably the interface between a liquid phase technique which continuously flows liquid, and a gas phase technique carried out in a vacuum was difficult for a long time. (wikibooks.org)
  • chromatograms
  • The filter is applied to individual mass chromatograms, plots of ion abundance versus retention time for each detected mass-to-charge ratio, and. (google.com)
  • combining a plurality of filtered mass chromatograms into a total ion current chromatogram. (google.com)
  • ratio
  • While the overall response factor of any specific analyte may be a complex function of experimental conditions, including competitive ion suppression, the response factor is the same for the isotopically labeled and unlabeled component and so cancels when comparing the ratio of their observed mass spectrometric signal. (scribd.com)
  • The objective of the work described here is to present an algorithm that quantitatively deconvolutes overlapping mass spectral peaks producing an accurate table of component peaks, identifies pairs of differentially labeled components, and calculates the ratio of stable isotope coded peptide pairs. (scribd.com)
  • system
  • Using standard flow methods, it is easy for an operator to physically 'see' if the system is leaking - but in microflow, you just won't know you have a leak because it's such a low flow rate - all you'll see is that your chromatography just looks bizarre or wrong," says Denham. (technologynetworks.com)
  • Program
  • 11. The program storage device of claim 9 , wherein said discrete data points correspond to integer mass values. (google.com)