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Related Concept Videos

Mass Spectrometry: Overview01:19

Mass Spectrometry: Overview

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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 electrospray 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...
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High-Resolution Mass Spectrometry (HRMS)01:15

High-Resolution Mass Spectrometry (HRMS)

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The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Mass Spectrum: Interpretation01:24

Mass Spectrum: Interpretation

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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 low-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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Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

1.0K
Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
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Mass Analyzers: Overview01:13

Mass Analyzers: Overview

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The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
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Analyzing Large Protein Complexes by Structural Mass Spectrometry
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Fourier-Transform Approach for Reconstructing Macromolecular Mass Defect Profiles.

Andrew K Swansiger1, Michael T Marty2, James S Prell1,3

  • 1Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97403-1253, United States.

Journal of the American Society for Mass Spectrometry
|December 16, 2021
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Summary

This study introduces a new Fourier transform method for macromolecular mass defect analysis in native mass spectrometry. This technique accurately characterizes complex mixtures of proteins and polymers, overcoming challenges in analyzing heterogeneous samples.

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Area of Science:

  • Biophysical Chemistry
  • Analytical Chemistry
  • Structural Biology

Background:

  • Native mass spectrometry (MS) analyzes intact biomolecular complexes, offering insights into noncovalent assemblies.
  • Studying heterogeneous and polydisperse native complexes, especially membrane proteins, remains challenging for traditional MS.
  • Macromolecular mass defect (MMD) analysis addresses ion population heterogeneity obscured by adducts.

Purpose of the Study:

  • To present an alternative, orthogonal MMD analysis method using Fourier transform (FT) in the iFAMS deconvolution program.
  • To demonstrate the efficacy of this FT-based MMD analysis for heterogeneous and polydisperse native MS data.
  • To validate the FT method against existing mass-domain algorithms like UniDec.

Main Methods:

  • Implementation of an FT-based MMD analysis algorithm within the iFAMS software.
  • Deconvolution of low-resolution native MS data with minimal user input.
  • Comparison of FT-derived MMD results with those from UniDec's mass-domain algorithm.

Main Results:

  • The FT-based iFAMS method successfully deconvolves heterogeneous ion populations from native MS data.
  • High-quality results were obtained even with low signal-to-noise ratios (approx. 5:1).
  • Strong agreement was observed between the FT (frequency-domain) and UniDec (mass-domain) MMD analyses.

Conclusions:

  • The FT-based MMD analysis provides an accurate and robust method for characterizing highly polydisperse and heterogeneous native MS data.
  • This approach is broadly applicable to various complex analytes, including membrane proteins, polymer conjugates, and branched polymers.
  • The FT algorithm facilitates the reconstruction of isotope profiles for complex mass spectra.