Mass Spectrometry And Its Applications To Organic Chemistry Pdf
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- Mass Spectrometry Applications Areas
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- Archives of Organic and Inorganic Chemical Sciences
Mass Spectrometry Applications Areas
In mass spectrometry, fragmentation is the dissociation of energetically unstable molecular ions formed from passing the molecules in the ionization chamber of a mass spectrometer. The fragments of a molecule cause a unique pattern in the mass spectrum. These reactions are well documented over the decades and fragmentation pattern is useful to determine the molar weight and structural information of the unknown molecule. Fragmentation can occur in the ion source in-source fragmentation   where it has been used with electron ionization  to help identify molecules and, recently , with electrospray ionization it has been shown to provide the same benefit in facilitating molecular identification. EISA and collision-induced dissociation CID among other physical events that impact ions are a part of gas phase ion chemistry.
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Mass spectrometry MS is a powerful analytical tool with many applications in pharmaceutical and biomedical field. The increase in sensitivity and resolution of the instrument has opened new dimensions in analysis of pharmaceuticals and complex metabolites of biological systems. Compared with other techniques, mass spectroscopy is only the technique for molecular weight determination, through which we can predict the molecular formula. Mass spectroscopy provides rich elemental information, which is an important asset to interpret complex mixture components. Thus, it is an important tool for structure elucidation of unknown compounds. Mass spectroscopy also helps in quantitative elemental analysis, that is, the intensity of a mass spectra signal is directly proportional to the percentage of corresponding element. Recent research has looked into the possible applications of mass spectrometers in biomedical field.
Mass spectrometry MS is an analytical technique that is used to measure the mass-to-charge ratio of ions. The results are typically presented as a mass spectrum , a plot of intensity as a function of the mass-to-charge ratio. Mass spectrometry is used in many different fields and is applied to pure samples as well as complex mixtures.
Most mass spectrometers are set up to analyze positively charged fragments, although negative-ion mass spectrometry also is possible. The elements of a mass spectrometer are shown in Figure With good resolution, only the ions of a single mass number will pass through the slit and impinge on the collector, even when the mass numbers are in the neighborhood of several thousand.
Specific applications of mass spectrometry include drug testing and discovery, food contamination detection, pesticide residue analysis, isotope ratio determination, protein identification, and carbon dating. Listed below are some application areas in which mass spectrometry has been used to discover, deduce, and quantify sample compounds. Applications of mass spectrometry in proteomics - Characterization of proteins and protein complexes, sequencing of peptides, and identification of posttranslational modifications.
Mass spectrometry , also called mass spectroscopy , analytic technique by which chemical substances are identified by the sorting of gaseous ions in electric and magnetic fields according to their mass-to-charge ratios.
Archives of Organic and Inorganic Chemical Sciences
DOI: Abstract PDF. With the Liquid Chromatography LC the separation of components can be done and then the sample eluents from LC are transferred into Mass Spectrometry MS where the detection, identification and determination of masses of components can be done in presence of other components. LC-MS is used in determination, of pharmaceutical drug substances, intermediates and its related compounds for quantitative and qualitative purpose. LC-MS is used most significantly in in-vitro dissolution, bio-equivalence, bioavailability and metabolite studies.
Mass spectrometry is a powerful analytical technique used to quantify known materials, to identify unknown compounds within a sample, and to elucidate the structure and chemical properties of different molecules. This technique basically studies the effect of ionizing energy on molecules. It depends upon chemical reactions in the gas phase in which sample molecules are consumed during the formation of ionic and neutral species. The first step in the mass spectrometric analysis of compounds is the production of gas phase ions of the compound, basically by electron ionization. This molecular ion undergoes fragmentation.