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Mass Spectrometers

Mass Spectrometers

This lesson details the instrumentation of a mass spectrometer—a physical instrument to perform mass spectrometry on analyte molecules and record the characteristic mass spectra. This is achieved via three chief functions:

Peptide Identification Using Tandem Mass Spectrometry

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Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
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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 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...

Mass Analyzers: Common Types

Mass Analyzers: Common Types

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Mass Spectrometry: Complex Analysis

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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.
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Tandem Mass Spectrometry

Tandem Mass Spectrometry

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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Related Experiment Video

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T-wave Ion Mobility-mass Spectrometry: Basic Experimental Procedures for Protein Complex Analysis

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Published on: August 1, 2010

Multiplexed MS/MS in a quadrupole ion trap mass spectrometer.

Jonathan Wilson¹, Richard W Vachet

¹Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, USA.

Analytical Chemistry

|December 15, 2004

Summary

A new multiplexing method enables simultaneous MS/MS analysis of multiple peptide ions in quadrupole ion trap mass spectrometry (QITMS). This approach enhances sample throughput and reduces analysis time by encoding ion intensity.

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Area of Science:

Analytical Chemistry
Mass Spectrometry
Biochemistry

Background:

Conventional tandem mass spectrometry (MS/MS) can be time-consuming for analyzing multiple samples.
Quadrupole ion trap mass spectrometers (QITMS) have specific ion accumulation characteristics.

Purpose of the Study:

To develop a multiplexing method for simultaneous MS/MS analysis of multiple peptide ions in QITMS.
To leverage QITMS ion accumulation properties for improved efficiency.

Main Methods:

Developed a multiplexing strategy utilizing inherent mass bias during ion accumulation in QITMS.
Employed Gaussian distributions relating ion intensity to RF trapping voltages for intensity encoding.
Utilized two arbitrary waveforms for ion isolation and dissociation.

Main Results:

Successfully correlated 66% of product ions from five precursor peptide ions using the multiplexing method.
Achieved accurate identification with only 6% misidentification of remaining product ions.
Demonstrated potential for increased sample throughput and reduced analysis times.

Conclusions:

The developed multiplexing method offers a significant advancement for MS/MS analysis in QITMS.
This technique can enhance efficiency, reduce analysis time, and improve signal-to-noise ratios.
The method shows promise for high-throughput proteomic studies.