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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 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 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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Mass Spectrum: Interpretation01:24

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An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...
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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.
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Amines can be identified using mass spectroscopy based on their characteristic fragmentation patterns. The molecular ions of amines undergo fragmentation via ⍺-cleavage. The ⍺-cleavage of the carbon-carbon bonds in amines generates an alkyl radical and resonance-stabilized nitrogen-containing cation.
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ForMileS: A Python Open-Source Program to Generate Molecular Structures for Tandem Mass Spectrometry Fragment Ions.

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This study introduces ForMileS, a Python tool for predicting fragment ion structures in tandem mass spectrometry. It aids in understanding collision-induced dissociation by generating plausible structures, though currently limited to smaller molecules.

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Area of Science:

  • Analytical Chemistry
  • Computational Chemistry

Background:

  • Tandem mass spectrometry (MS/MS) is crucial in chemistry, but fragmentation mechanisms like collision-induced dissociation (CID) are not fully understood.
  • Predicting fragment ion structures while maintaining precursor ion features is a significant challenge in MS/MS data analysis.

Purpose of the Study:

  • To introduce ForMileS (Formation of Mass SMILES), an open-source Python workflow for generating fragment ion structures from MS/MS data.
  • To provide a tool that incorporates precursor-specific constraints and aids in understanding fragmentation pathways.

Main Methods:

  • Developed a streamlined Python workflow utilizing a simplified branch-and-bound algorithm.
  • Input includes molecular formula, charge state, exact mass, base molecular scaffold (SMILES), and parameters for branching, cyclicity, and bond types.
  • Applied Density Functional Theory (DFT) for relative energy calculations to validate generated structures.

Main Results:

  • Demonstrated ForMileS on Polypropylene Glycol Octamer (PPG8) fragments, showing the importance of the base molecular scaffold.
  • For dipropylene glycol dimethyl ether (DGDE) fragments, identified linear double-bonded and cyclic structures as plausible, with linear structures being energetically favored.
  • Confirmed the presence of expected structures and identified lowest energy conformers via DFT.

Conclusions:

  • ForMileS successfully generates plausible fragment ion structures for MS/MS analysis.
  • Current limitations include the combinatorial charge generation and unrefined algorithm, restricting application to small molecules (e.g., C6O3H19).
  • Future work should focus on optimization using heuristics and energetic filters to enhance performance and applicability.