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Mass Spectrometry: Molecular Fragmentation Overview01:20

Mass Spectrometry: Molecular Fragmentation Overview

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The ionization of a molecule into a molecular ion inside the mass spectrometer causes instability in the molecule's structure due to the loss of an electron. This eventually leads to the fragmentation or breaking of some bonds in the molecule. The fragmentation occurs predominantly at specific bonds to yield relatively stable fragments.
One type of fragmentation pattern is the cleavage of a single bond in the molecular ion. The cleavage leads to a radical and a cation. The cleavage can occur at...
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Tandem Mass Spectrometry01:21

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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
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Mass Spectrometry: Alcohol Fragmentation01:03

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Alcohols (R-OH) ionize to lose one non-bonded electron from the oxygen atom, forming molecular ions. Due to their tendency to fragment rapidly, the intensity of the molecular ion peak in the mass spectrum is weak or sometimes absent. The fragmentation patterns for alcohols occur in two ways, i.e. ⍺-cleavage and dehydration. During ⍺-cleavage, the bond at the ⍺-position adjacent to the hydroxyl group cleaves to give a resonance-stabilized cation and a radical. However, intramolecular...
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The fragmentation patterns observed for compounds such as carboxylic acids, esters, and amides in the mass spectra include ⍺-cleavage and McLafferty rearrangement. Fragmentation by ⍺-cleavage preferentially occurs at the carbon-carbon bond at the ⍺-position next to the carboxylic group to generate a neutral radical and a cation. Long chain compounds with hydrogen at their γ-carbon undergo McLafferty rearrangement to give a radical cation and a neutral alkene.
For example, the...
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Mass Spectrometry: Aromatic Compound Fragmentation01:23

Mass Spectrometry: Aromatic Compound Fragmentation

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Upon ionization, aromatic compounds generate a molecular ion that is observed as a prominent peak in their mass spectra. For example, the molecular ion peak for benzene appears at a mass-to-charge ratio of 78, while toluene is observed at a mass-to-charge ratio of 92. The molecular ion benzene is highly stable and does not readily undergo further fragmentation due to the significant amount of energy required to disrupt the aromatic stability of the benzene ring. In contrast, the molecular ion...
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Mass Spectrometry: Overview01:19

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Mass spectrometry is an analytical technique used to determine the molecular mass and molecular formula of a compound. The basic principle of mass spectrometry is to generate ions from the analyte molecule and measure these ion abundances against their molecular mass. One common type of ionization, known as electron ionization or EI, bombards the analyte molecules in the gas phase with high-energy electron beams. The electron beams displace an electron from the molecule and leave behind a...
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Microsolvation within the Systematic Molecular Fragmentation by Annihilation Approach.

Rika Kobayashi1,2, Roger Amos2, Michael A Collins3

  • 1International Centre for Quantum and Molecular Structure, College of Sciences, Shanghai University , Shanghai 200444, China.

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Systematic molecular fragmentation by annihilation (SMFA) accurately describes solvation effects in glycine and DNA base pairs. This computational chemistry method efficiently handles complex hydrogen bonding, promising for large biological system studies.

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Area of Science:

  • Computational Chemistry
  • Molecular Modeling
  • Biophysics

Background:

  • Explicit solvation is crucial for accurately modeling biological molecules.
  • Accurate computational methods are needed for complex systems like DNA base pairs and amino acids in water.
  • Hydrogen bonding significantly influences molecular structures and interactions in biological systems.

Purpose of the Study:

  • To evaluate the effectiveness of the systematic molecular fragmentation by annihilation (SMFA) technique.
  • To assess SMFA's capability in describing molecular structures and hydrogen bonding in solvated systems.
  • To determine if SMFA can provide accurate energies comparable to full molecule calculations.

Main Methods:

  • Application of the systematic molecular fragmentation by annihilation (SMFA) method.
  • Modeling of glycine and DNA base pairs within water clusters.
  • Comparison of SMFA results with full molecule computational data.

Main Results:

  • SMFA successfully described molecular structures, particularly complex hydrogen bonding.
  • Energies obtained via SMFA were comparable to those from full molecule calculations.
  • The method demonstrated efficiency in managing large computational tasks without sacrificing accuracy.

Conclusions:

  • SMFA is a viable computational technique for studying solvation effects in molecular systems.
  • The method's accuracy and efficiency show significant promise for complex biological applications.
  • SMFA offers a pathway to more manageable computational studies of biologically relevant systems.